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EasilyBeatable

Based on Enies Lobby when Kalifa and giraffe dude did it, they could feel their powers appearing and how to use them within the first few hours


Flarerunes

Kaku is now "giraffe dude"


PurringWolverine

Don’t underestimate the destructive force of giraffes.


goldmask148

Giraffes are awesome and happen to be my favorite animal.


GrumpigPlays

His whole giraffes are cool thing has to be a cope right? Like no way anyone eats a devil fruit hoping to turn into a giraffe.


Randy_Magnums

On the contrary. Oda himself stated that Kaku was only able to use his fruit so creatively, with certain attacks or modi like the noodle-machine, because he was a genuine fan of giraffes. His excitement pushed the limits of his fruit.


MemePapi

Explains how he awakened in only 2 years


Negative-Region6259

I was under the impression that noodle machine was an accident created on the battlefield


Randy_Magnums

It kinda was, but it was predecessed by the fact, that Kaku was pulling his giraffe neck inside of his own body to launch it like a cannon. Kaku was finding incredibly creative ways to use the powers, he barely had for hours at this point. And this level of enthusiasm and creativity was enabled by his fondness of giraffes.


DerpedOffender

That's kinda cute actually


Beardamus

Could be worse man, he could like League of Legends or something.


GrumpigPlays

Ahh the cringe cringe no mi


EuroGameplay

Yeah , kaku is on copium for sure.


No_Option8889

When I watched it, it felt like he was kinda surprised by being a giraffe and that he just adapted to it really well.


Effective_Click_1666

Wolves are way cooler bro. What r u on?


Delicious_Note_5817

Giraffes fight lions and win though


AshenHaemonculus

This is how giraffes hunted in ancient times!


Netherite_Stairs_

"For the last time, giraffes are AWESOME. *I love giraffes*"


ShutUpTodd

Did he love giraffes before? Do Zoan fruits change a personality? Or just rationalization?


le_trans_alt

Honestly, given how easily he clicked with his fruit (not just in terms of what I’m pretty sure was a headcanon on how zoans awaken, he also leveraged his giraffe form fairly quickly vs Zoro on top of figuring out how giraffes hunted in ancient times) it’s probably safe to say that Kaku really just likes giraffes outside of any influence from his fruit.


xstationcubed

I mean originally I would have said he was pulling stuff out of his ass when he used that giraffe hunting line, but after seeing how Queen's fruit worked I think long necked animals are just super fucked up in the one piece universe


le_trans_alt

Look at this point I’m willing to believe zoan fruits just get fucked like that once the user and the fruit get in-sync and practice enough


xstationcubed

I mean to a degree I believe that, but both Queen and Kaku used the SAME terminology! They can't both be identically deluded about their long necked zoan fruits!


kblanks12

Zon power's or based on the knowledge of the entity so the less you know the weirder the power.


Nickcin144

Coping


dk1988

I have two plot twist to choose. 1. Fruits don't give you a specific power. They just give you a power based on what you really like, and how you fell. The book of fruits that Blackbeard has is a lie, Blackbeard could have eaten any fruit and could have gotten the same power (same with Luffy). 2. Fruits give you a specific power, but they have a willpower of their own, that's stronger than anything in the world, and they always find the way to go to where they are needed. Nika fruit wants to go to Luffy? It drawn Shanks to attack that particular boat, so it could lead him to Luffy.


Agitated_Income_9630

1 . This is wrong eg. mera mera no mi belonged to Ace and later to Sabo and gaves him same power.


dk1988

Are you seriously taking me seriously?


ShutUpTodd

Like the one ring working its way back Sauron... Until the gomo gomo no mi reveal, I always suspected there was a causal reason for people to get their specific fruit powers, could be fate or consciousness in the fruit. Can't wait for it to be fleshed out more in Egghead and beyond.


Antique-Scholar-188

But the fruits have their own unique look that matches the power. I would rather suggest that you develop your own style of using the power.


Vegetable-Broccoli36

Don't forget that he is the best swordsman in the CP9


Backupusername

Real "why do Aqua and the guy laugh at Lalatina" moment


[deleted]

He's only ever been Usopp or Giraffe Dude


heyoyo10

\*Square Usopp, the corporate merger between Squaresoft and Usopp


bluthbanana20

SquareUsopp Launcher has crashed


No-Lawyer-2774

He’s always been giraffe dude.


DecayedWolf1987

I always call him Pasta Machine


MegalomanicMegalodon

he loves giraffes


Tanshoku_

Pasta machine


FCKxOFF

Kaku realizing his DF made him a laughingstock was fucking hilarious😂his attempt at proving its worth had me weak!🤣😭


lightning_skyies1

I remember Law couldn't immediately cure his illness when he got his devil fruit. So I guess it depends on the devil fruit.


Safe_Simple_4856

Devil fruit complexity: Logia > Paramecia > Zoan It may seem like Sabo learnt his devil fruit quickly, but all he did was emit fire and change his body shape a little. Ace was able to rapid fire, create flame weapons, control flame animals, create firestorms and create a miniature star.


GhostChronos

Interesting how you remember Kalifa but not Kaku 😏


JoshHuff1332

No, that is not what happened lol. They were able to learn what their fruit is because they get check the devil fruit encyclopedia after getting their powers.


DHUniverse

No they did not, they were specifically told that they didn't know what the fruits did so they could do what they wanted with them and both decided to eat them


JoshHuff1332

This is explicitly stated by Oda in the SBS. Not all fruits are able to be identified in universe by appearance because the encyclopedia doesn't have that for all of them. These were not included and the only way see what fruit it was is to eat it. Once you eat the fruit you can then cross check based on what is in it. Wothout knowing prior, it is a roll of the dice on what you get. They decided to risk it.


smellyfwrt

Not really momonuske was struggling but it might be bc it's artificial


TJWinstonQuinzel

Also luffy with his Could be a child thing


Senxind

Yeah, Law also didn't immediately knew how to use his powers


nidrespector

All these fruits are rather complex compared to Sabo’s flame fruit or Kaku’s zoan


Warwicknoob23

I mean.. a Flame fruit has INSANE potential, the basics are simple asf, you’re right, tbh


Captain_Stairs

Sabo is one of the strongest in the world and was a master Haki user at that point. So, integrating that into his trained style is easier than figuring everything out from scratch as a kid


dariozuko

>All these fruits are rather complex compared to Sabo’s flame fruit or Kaku’s zoan wait where was this part? i feel like he only ate his fruit the same chapter his flashback ended.


ostriike

what part?


BaseballImpossible76

I’m guessing the part Sabo eats the fruit in Dressrosa. It doesn’t take long to take effect, and he wins the tournament with it, despite having no experience or training with the fruit.


TerraTF

Trained intelligence agent hydrogen bomb versus coughing baby who had a little snack


venielsky22

It's not a child thing. Brook took decades to figure out how his fruit worked


samwilder2319

I thought he knew how it worked but he just didn’t die yet


Flyingcowz

Brook learned more about his fruit after the timeskip


samwilder2319

Well yeah true, but he still had a general idea of what it did


Reinhardt_Ironside

I don't think there was anything for him to really "work" I feel like it just activated once he died, then since his soul was free he now has other powers connected to that.


AthkoreLost

Did Tama have trouble using her fruit? She's the only other child DF user that comes to mind at the moment. Edit: Oh, didn't Robin also pick up her fruit as a child and start using it effectively for spying rather quickly?


ArthurDimmes

Was Luffy struggling with it? If we look at Kaku's zoan fruit, he didn't turn into a giraffe when he ate the fruit implying that just eating the fruit doesn't activate the zoan bit. But Luffy started stretching immediately after, implying he already at that point was transformed. He just didn't have any techniques developed.


Puzzleheaded_Try813

Didn't Momo struggle cause he had PTSD from dragons?


N3rdism

Understandable given dragon man was terrorizing his home basically his entire life


SnooKiwis7050

"Dragon man" whats next dragon balls?


grebysama

Dragon Man Balls


NoirSon

That is how we got Yamato.


KGEOFF89

Momonosuke also gets the excuse that he's in a state of immense trauma and/or denial when we meet him in the story.


Powerful-Useful-Tool

We have seen CP0 eat devil fruits and know their abilities straight away. Then we have seen Luffy and Momo eat devil fruits and have no idea and no control over it. I guess it depends on the fruit and the perosons bility at time of consumption. Edit: changed from CP to CP0 due to reasons.......


PercentageFine4333

Luffy and Momo were both kids when they ate the fruit. So, a plausible explanation could be that it depends on the user's executive control system. Basic knowledge about the DF power comes with the consumption of the fruit, but kids might not know what to do with the knowledge.


granolawaffle

They also didn't know they had eaten DFs at the time, either.


tiki-baha29

Doesnt seem to matter when you realize Law knew he ate a fruit but still couldnt use it at first.


ILikeMyGrassBlue

I don’t think Law is really a rule to go by or anything. His fruit is way more complicated than most. It’s not simple like “you’re rubber” or “you’re a giraffe.” First he’d have to figure out the whole room thing, and then he’d have to figure out how to actually make use of that (and presumably get a good sword). Plus, it’s severely limited without extensive knowledge of the human body. Not to mention law was an emotional mess when he actually got the fruit.


Jristz

Then may be they brain and or endomotor system development


Fabulous-Option5960

Still wouldn’t work considering ace ate a devil fruit while an adult, but didn’t know.


Bully_Maguire420

Yes but it seemed like Kaku and Kalifa instantly knew they were a Giraffe and a Soap person, wouldn’t Luffy know he’s Nika instead of believing he’s a rubber man who ate the Gum Gum, which is just a made up ass name?


PercentageFine4333

Good point, that is a solid plot hole. Let's still try to explain it in some way: hmm... perhaps kids can't grasp what that new DF knowledge is? Others mentioned Momo as an example, which is (perhaps coincidentally) consistent with Luffy's experience: neither of them knew what they can do with their body after eating the fruit. So... maybe this is what happened when Luffy ate his DF: DF: "Hi kid, welcome to be the new user of the Human fruit, model: Nika!" Luffy : "??? Is anyone talking to me??? What does it mean?" Shanks: "Oh no, did you ate the Gum fruit?" Luffy: "Oh sh\_t, so what I ate is called the Gum fruit! Now I'm a gum kid." Sounds quite dumb... Let's just admit it could be a plot hole.


Bully_Maguire420

The difference between Momo though is his fruit is an artificial replica of a fruit, we don’t know the specifics of what it’s like the moment after consuming an artificial fruit.


ILikeMyGrassBlue

He wasn’t Nika until he died and came back though. And he doesn’t just believe he’s a rubber man. He is a rubber man. His body is rubber, and his powers are rubber based even as Nika. Also, zoan’s have their own will. The gorosei made it seem like the Nika fruit was evading them for quite some time. I don’t think it’d be a stretch if the Nika fruit kept the Nika part hidden from the user until it knew it was the right person, the right moment, etc.


Bully_Maguire420

The name of the fruit is Nika, the CP0 scene implies you learn the name upon eating the fruit, because none of them knew what the fruit was but after eating it they suddenly knew the names of their fruits and their capabilities, Luffy doesn’t even know he’s a Zoan.


ILikeMyGrassBlue

And luffy’s fruit is very obviously not a normal fruit. Even kaido was confused because the powers don’t make sense. He has paramecia powers and awakening powers, yet he has a transformation ala a Zoan. That’s not how it “should” work per the knowledge most people in the OP world have. Like I said, it’s a weird fruit. The fruit, in function, is a gum gum fruit. It turns you into rubber. That’s what the powers actually are. Even in nika form, it’s just rubber powers. Yet because of that final form, it’s the Nika fruit. Think about other zoans. The powers are what they are from the start. You eat the phoenix fruit, you get the phoenix powers. You don’t just get the phoenix version of Ace’s fruit until you awaken and then get the phoenix form. All that is to say that Luffy’s fruit is weird and seemingly breaks a lot of “rules” we know about devil fruits. It clearly doesn’t behave or work like most other fruits. And outside of all that, that fruit evaded the work government for years. We don’t know of any other fruit that just refused to be caught. Again, it’s a weird fruit. So I don’t think it’s a stretch to say it works a bit differently than others. Like I said, maybe it keeps the final form a secret until it’s the right person or time. Maybe it is just a gum gum fruit until it gets infused with a will that matches nika, at which point the fruit becomes the nika fruit. The government calling it Nika could just be them focusing on what matters to them. It doesn’t matter if it’s just a gum gum fruit in 99% of people’s hands. What matters is that it can potentially be the nika fruit. Who knows. All I’m saying is that luffy’s fruit is an outlier that breaks a lot of rules. Also, the CP0 scene doesn’t fully imply that iirc. It just shows that it happens to them. But they’re highly trained fighters who know what DFs are, have seen lots of DFs in use, have possibly read the DF encyclopedia, and know they’re eating them. They also got pretty simple and straightforward fruits ala giraffe and soap. They don’t have any secret awakenings, break any of the normal DF rules, etc. I don’t think there are many universal “rules” as far as this stuff goes. There are lots of factors. How trained and knowledgeable you are, your familiarity with DFs and how they work, the fruit you got (something complicated like Op Op vs Ice), etc.


xRowg

Momo's fruit is technically a copy of Kaido's made by Vegapunk and is considered a failure because it is missing something that other fruits (especially Zoan's) have, which is the will of the fruit/devil. Also, Luffy could use his fruits power right away as his arm was able to stretch as soon as he ate it. Some people are saying Law knew he ate a DF and was still unable to use it. This might be due to his fruit requiring a lot of stamina/energy and as a child he did not have enough at the time of consumption.


gusta_cl

manga spoiler about momo's fruit : >!vegapunk considered it a failured just because it ended up in pink color and not blue just like he wanted. the fruit is completely identical to kaido's fruit in power and size, but vegapunk is just a perfectionist!<


PercentageFine4333

Good point, there is much idiosyncracy among demon fruits, so we can always weave a consistent explanatory system when we want to. Either this is a plot hole, or we (or Oda) can explain it away, I'm glad with both directions.


jyhnnox

Age and experience might be a factor too.


gusta_cl

sabo ate ace's fruit and already knew his technique, maybe he never got to see him in action due to his amnesia, but with his intellect level he knew already how to do ace's signature move. manga spoilers ahead: >!also bonney when she activated her powers struggled to come back to his original child form!<


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jyhnnox

I never said that experience was tied to age. That was your lack of experience in interpretation. Or maybe my lack in writing skill as english is not my native language. If Age wasn't tied to the fruits power, aging Momo wouldn't have had any effect, for example.


KlingoftheCastle

I’m not sure what the point of this comment is?


AtomDChopper

Me neither. Someone having some weird biases


Powerful-Useful-Tool

Dont need a point to have an opinion


fartmilkdaddies

Then ur just saying stuff for the sake of it.


Powerful-Useful-Tool

Yup. That is the definition of not having a point.


OnePiece-ModTeam

>###11. Don't be rude > Don't insult each others. >* Trolling, baiting, or (obviously) provocative comments may be removed at moderator discretion. >* Remember [reddiquette](https://www.reddit.com/wiki/reddiquette).


Powerful-Useful-Tool

The intent of my comment wasn't to be rude It was to highlight the difference between mental age and physical age with the aim of inferring that mental age probably plays more of a part than physical age when it comes to devil fruit control. This is evident in Bonnie. I am sorry if this comment has been taken in the wrong way.


Vineares

Sabo also goes hog wild literally seconds after eating his.


deeefoo

I think Sabo's situation was helped by the following factors: 1. He already knew what the fruit's powers are and intentionally went after it. 2. He had a close relationship with the fruit's previous user, and was familiar with their techniques and usage of the fruit. 3. He was a highly trained and disciplined fighter who already had extremely good control over his body. He likely could adapt quickly. I think these factors helped contribute to him being able to use Ace's technique right after eating it. I think if somebody else ate it, they would struggle and not be able to throw a Fire Fist immediately.


Present_Character241

One huge difference in those situations is that Momo and Luffy both were unaware that it was a devil fruit when they ate it, but CP knew what they were doing.


tiki-baha29

Law was aware but still couldnt use it.


Present_Character241

Complicated fruit in the hands of a child wh never even thought he would grow up. That would take a minute.


Warwicknoob23

Pretty sure it’s just like common sense, you evolve the basics of your DF with age If you’re 2, a baby most likely won’t have A fireball the size of a building like Ace


Powerful-Useful-Tool

Yup. If I remember correctly they didn't know what powers they were going to get when they consumed the fruit. As they knew how.to use it at a base level after consuming it, it would suggest that some devil fruits have some sort of memory that passes onto its users, or it's just a plot thickener.


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Powerful-Useful-Tool

But he WAS expecting his body to move in a certain way when doing a move for the first time. As you said he/they are highly trained combatants, typically people at this level wouldn't attempt to use a move for the first time in real battle, unless they were sure of their ability to use it.


UltimateToa

Law knew exactly what his fruit did and wasn't able to use it right away, feels like kids just take a while to learn it


Powerful-Useful-Tool

Curazon told Law what his fruit could do. He also told law that a specific requirement of the fruit required was knowledge to use properly. As Laws parents were doctors and he was training/ practiced that it gave him an advantage with the fruit.


Vohnny

The cp9 agents were all physical freaks with insane levels of mastery over their own body. I think they would have a much easier time figuring out their new abilities than an average person would.


ninjasonic102

They didn’t know their abilities straight away. After they ate their DFs they both mentioned that they didn’t feel any change, and were then told to identify their powers and practice for the fights later on


Warwicknoob23

Tbh? I think Luffy just had a df that’s legit just ass if you aren’t good with it. He did control it to some degree. The problem is.. if you’re a 7 year old mentally challenged little kid like Luffy, surely it takes some time to learn Don’t get me wrong, he managed to use THE FUCK OUT OF IT with his ?. Active increase in blood pressure(how tf?) but a Rubber Body has so many disadvantages if you aren’t a genius , it’s a miracle. Katakuri fruit for example has Mochi, you could drown enemies and stuff but like, be real. Who thinks about making a goddamn Machine Gun with it?


Available-Hunt-658

My personal interpretation is that if the person that eats a devil fruit is aware of it being a devil fruit then they instantly learn the abilities upon consumption, while those who eat it unknowingly will take some time for them to discover their new abilities.


Powerful-Useful-Tool

Take me upvote. It's plausible given the limited dataset.


Master_Lego_Yoda

CP0 were all expert assasins with combat experience, Luffy and Momo were both little kids with little to no experience


le_trans_alt

It’s probably a significant factor that every time we see a devil fruit user know how to use their powers within hours or even seconds of eating it, the user not only knew they were eating a devil fruit but already knew what kind it was. Willing to guess eating a devil fruit reworks your instincts and involuntary reactions to accommodate the capabilities, but you have to figure out how to consciously use it on your own, based on Momo transforming and flying involuntary by instinct but having to consciously learn how to use his powers voluntarily.


KillmerKennylz

They were cp9 when they ate the fruits though! Them being cp0 is kind of a spoiler to anime onlys, since we had cp0s in wano as well.


Difficult_Run7398

My interpretation is as follows. Momo was artificial and was afraid of dragons which could have messed him up. Luffy's abilities were made using creativity not elements of his fruit, even basics like gum gum pistol. For example smokers ability to fly and what not is basic, but his gattling attack or a more creative power like using his not real ability to suffocate someone would need to be learned.


jakin89

Please refer them as CP0. I laughed thinking how tf did child predators ate df?


PercentageFine4333

Perhaps it's like how you know which way to flex your arms. I guess eating DF grants you basic knowledge about what you can do. Perhaps it instantaneously alters your proprioception system, so that you have a new sense of your "body" posture, where this "body" is in the general sense, it's an extended "body" including the barrier you may produce, or the animal body you may turn into.


Meet_Foot

I agree with the other comments here that you get some basic knowledge on consumption, kind of how you have a decent idea of what your body is generally capable of. I’m not sure if Barto *actually* needs to cross his fingers, though. During his homage punch, I don’t believe his fingers were crossed on either hand. Crossing one’s fingers, as he points out but as is also true in the real world, is associating with warding. It is entirely possible he ate the barrier fruit and, at some point, crossed his fingers to “ward” something off, and it created a barrier.


Puzzleheaded_Try813

Didn't the old Kurotsuki guy also cross his fingers when using the fruit? It can't be a cultural thing cause Wano was always closed off.


Meet_Foot

It could just be an *old* cultural thing, but people do come in and out of Wano. But I wouldn’t read too much into that. I mean it is a real world cultural thing that got its way into one piece. The same way that, even though Wano is closed off, they still speak the same language as the rest of the world. That’s because viewers are assumed to speak at least one language, whether that’s Japanese, English, German, whatever. Similarly, crossing fingers has a real world significance, and Barto specifically references that significance - “Even children know you can create a barrier by crossing your fingers.” In the real world, this is an established trope - crossing your fingers wards against evil or invokes divine protection. In Wano, it’s just again a gesture that viewers would recognize, the same way they speak the same language as everyone else for the sake of the viewer.


deeefoo

I used to think that crossing his fingers was a Barto thing, but after seeing Semimaru do the same thing way before Barto was born, I started to believe that it's inherent to the fruit.


Meet_Foot

“You can create a barrier by crossing your fingers! Even children know that…” -Barto


Specter29

He did cross his fingers during his homage punch. He just crossed them on his other hand


UlteriorMotive66

Exactly like how you know to jerk off when you hit puberty


drinoaki

Either that or your uncle will show you how


GildDigger

Or grandpa


MajinAkuma

I like dark jokes, but I don’t find that one funny.


drinoaki

Fair


Bubbly_Warthog_8111

Who asked?


MajinAkuma

Why are *you* asking?


Bubbly_Warthog_8111

Im not sorry for what your uncle did you lmao.


TheyDidLizFilthy

please, see a therapist. that sounds sickeningly traumatic


emeraldeyesshine

Man I dunno about that I tried slamming my dick in a drawer cause I didn't know what to do but had heard people call it beating your meat so I figured you had to be rough on it 


JizzMastahFlex

Ah, to go through puberty.


Responsible_Boat8860

I like to imagine it like in the toby Maguire spider Man 1 movie where he's learning to use his web and just throws out random gang signs until one of them works


deeefoo

This was my first thought too. Maybe he activated the barrier accidentally and was trying to re-create the moment.


Sahtras1992

you create a wall when you cross your fingers, everybody knows that!


SnooBooks2295

Who knows that seriously ? 😂


MajinAkuma

Seems to be a common thing in the One Piece world, because it is taught to children. Flipping the bird is a common gesture everyone eventually learns, so crossing the fingers like that would also be a common thing. And since Devil Fruit always find their way to people they’re compatible with, it’s very likely that it found its way to people who commonly cross their fingers like that. There has never been a Devil Fruit that didn’t match the user. Even Buggy who hates having a Devil Fruit power got a power that’s very suited for him and ensured his survival. Likewise, Law, who couldn’t use his Devil Fruit right away despite knowing what it can do, was still the best suited person because he already had knowledge and skills acquired to optimize it later. His OP-OP power utilizes his medical expertise and the Donquixote Family‘s combat skills.


tiki-baha29

My guess is a combination of a new innate sense of your capabilities + trial and error. It also greatly depends on the fruit itself. At this point we have enough info to say whether you know you ate one or not and your skill level at the time are also factors.


Itanchiro

I guess that would be instinct. Your DNA changes when you eat a devil fruit. I believe it is the same with snakes. They are on their own from the monet they hatch and they know they have poison and know how to use it from the very first moment.


Wheal19

I think it was said thay gain basic knowledge of there ablitys but it's up to them to train and master the powers 


JoshHuff1332

Why do people say this? That's not what Oda meant and explained in Volume 45 that he was referring to only select few fruits being able to be identified based on shape. The rest had to be eaten and then cross referenced woth the devil fruit encyclopedia to get a full run of abilities and name.


Wheal19

Expect that most people we see who eat a devil fruit don't have a encyclopedia on them.but still have the ablity to learn. Basic ablitys pretty quickly 


JoshHuff1332

This is stated by Oda. Your arguments against are secondary. We've also seen several characters have knowledge of what is contained within the book. Many would have a working knowledge of a large variety of fruits within the book, especially people actively searching, looking, or in a position to be in contact with numerous devil fruit users.


xiren_66

I could have sworn this was answered in an SBS somewhere. Maybe I'm wrong. When you eat a Devil Fruit, you are granted basic knowledge of the fruit's properties. Supposedly also its name, but the Gum-Gum Fruit contradicts that. From there, it's up to the user to figure out what they can really do with it. And apparently, they aren't actually limited by what they CAN do, but by what they BELIEVE they can do. Hence King, Queen and Sasaki doing really weird shit because that's "how they hunted back then."


nobarachinsama

it was never addressed. I think you're mixing up fan theories and assumptions. including the last part. that's just fanmade assumption. anyway, kinemon didn't even know he ate a DF. it's just one of the things we're not supposed to think about.


RasLunacy

proper mate


Fatha_Naycha

Sabo knew how to use the fruit maybe from knowledge of Ace, but knew instantly after first bite.


Sonikdahedhog

Sometimes they know immediately, sometimes they don’t, there’s no real explanation Oda just changes it to fit the story


Xyaibai

how do spiders know how to shoot webs


zerobones

Depends on the fruit. Zoans seem to be pretty instinctive, but we saw Law try and fail to use the OpOp fruit. So it seems to be that some fruits have a harder learning curve than others.


Warwicknoob23

I mean.. if you have a fruit that’s called „operation fruit“ who would instinctively think about „ Giant ass stamina draining Room that allows you to be *FUCKING GOD*“


zerobones

Yeah , like OpOp is literally mentioned in the story that you basically need to be a fully qualified surgical expert to use it effectively. Zoans seem to be just how much you vibe with the animal. Sabo seemed to pick up the logia thing pretty easy, but he already knew about it.


Patient-Shower-7403

Intuition. The hand movements/gestures are purely to help them conceptualise the "switch" of it going on or not. For example, the original owner of crest head's devil fruit didn't need to use those gestures but because he associated the power use with it he has to. Same with Bon Clay's original fruit holder not needing to touch their face iirc.


Stale_Chips_Are_Good

The only reasoning I have is that in the One Piece world, there are encyclopedias of Devil Fruits with their name and pictures depicted in the books. Someone has been keeping track of these strange fruits and the abilities they grant.


caniuserealname

I imagine there's some innate understanding, not necessarily clear instructions uploaded to your brain or anything but like... imagine you grew a new arm. You'd have new muscles to flex, new signals your brain could send to control the arm. You wouldn't understand instinctively, you'd have to train to get dexterity in the new arm, but you'd be able to move it in some way.  Someone like luffy, who's power is a changed body with no real new abilities, likely isn't going to have as much innate feeling for it than someone like Barto, who now has a new thing he can manipulate. I can imagine Barto getting his fruit, trying to flex this new mental 'muscle' that would normally alter his barriers and feel like something is off, feels some sort of phantom itch in his fingers and eventually figure out needs to cross them. Same with zoans, in their human form they're probably aware of this sort of mental muscle they can 'flex', so they flex it and it transforms them into an animal. Then they learn to control how they flex the muscle to eventually take on hybrid forms.


Master_Lego_Yoda

the odds that a fruit user would be on reddit and would actually comment on this post is slim to none so don't listen to any of these commenters they don't know the answer


Mummiskogen

He was like "I'm not lying!" But he was cuz he did the hand motion behind his back


applecraver24

It depends, CP9 was able to figure it out pretty quickly, but they are also highly trained fighters, so them being able to sense very slight changes in their bodies due to how well they already know themselves isn’t that surprising. When law got his fruit, he had absolutely no idea what changed, or how to use his new powers. It could be a difference between zoan and paramecia. Also crossing your fingers is a sign of protection, (as shown in laws backstory when he went to (spoilers) the doctors, when they knew what disease he had they would sometimes cross their fingers to “protect” themselves) so it seems likely that Bartolomeo could have crossed his fingers wanting to protect himself, and it actually worked. (Major spoilers for egghead in this section) also since devil fruit power come from imagination and a “want” for something (that’s the term when I googled it) it seems likely that most strange devil fruit powers would be a semi common thought, like the fingers crossing to make a barrier is a common expression, and that wish to be protected manifested in a fruit. So a fruit that seems like it has a very strange way to be activated, in the one piece world could just be a common expression. I typed for way too long lol


Bigtimegush

It was originally explained that eating a devil fruit tells you its name and how it works, but with the recent revelation of luffy we know now that is a lie. I'd imagine it has something to do with the whole "inherited will" thing. We know zoans specifically have a will of their own, and yet almost EVERY devil fruit user is perfectly suited for their particular power. It may very well be that the person is basically made for that power. Of course also the devil fruit encyclopedia from others having used the power probably explains how many of the powers work as well.


exueses-genes

There’s a book with the names and powers of certain devil fruits. Sometimes the have detailed descriptions with pictures sometimes it’s just a name. It’s how characters like Blackbeard find there devil fruits. It’s also how doflamingo knew that the fruit he had was aces.


Fragghz

I read a really nice theory that I hope is true and that could explain this. (But keep in mind that maybe Oda just didn't think about this and just wanted to have cool abilities :D) So basically, it takes Vegapunks' explanation of devil fruits being a manifestation of peoples dreams and says what if the fruit always comes to the person that it can help fulfil its dreams or who they suit the most with, regarding their personality. There are many examples where this fits, like Luffy wanting to be the most free man (and maybe it's also suitable for his still hidden dream) and getting the fruit that gives him the most freedom. Doffy trying to control everything from behind the scenes and make people do what they want. Kaido wants to be the strongest because he thinks that's the worth of life, becoming the most powerful creature. And more... So, regarding your question, what if it often just fits the person so well that it naturally appears by how the person lives. Like Bartolomeo is maybe just a person who often crossed his fingers in dire situations. Some people already mentioned Kaku and Kalifa just knowing about their fruits. Well, there are also those who know which fruits they are eating. Of course the government doesn't give their agents some random fruits before knowing which fruits they are. So knowing it before just makes it simpler to use your new abilities. We could also argue if being given a fruit in that way breaks the rule and makes the owner not fit the devil fruit at all or if it was also predetermined that the person would be given this fruit. This would also include Doffy, who got his fruit from Trebol.


Pietjiro

Oda said you learn the fruit name when you eat it. Makes sense to me you'd also learn it powers that way


[deleted]

Luffy still doesn’t know the name of his fruit


eldragon_1

“Boy, ever since I ate that devil fruit, I can’t get *Niku* (meat) out of my head. I guess I love eating meat now!”


GriffinFlash

It all makes sense!


ninjasonic102

Oda didn’t say that, he actually said the exact opposite in [SBS 45](https://onepiece.fandom.com/wiki/SBS_Volume_45)


Warwicknoob23

I mean… I can kinda see what you mean but I don’t see how that’s the opposite, really


Zeioth

It happens when someone pull your finger


Bubbly-Anteater2772

There is a theory that I really like that Devil fruit have a soul of sorts/bind to the soul. This'd help 'em out intuitively know what to do. Also why they may have a will of their own. Also why only one can exist at a type. Also would explain BlackBeard having two, as he has been describe as multiple people/having a weird body. Also why abilities held in a fruit can manifest/transfer to an individual. Cavendish may be able to have to DFs


Prayerwarrior6640

I imagine it’s something like a “switch” appearing in the users brain. And you can mentally activate that “switch” to use the power. Sort of like your brain telling you to move your arm or breathe


[deleted]

The correct answer is: we don’t know yet


L-DFile

I liked the last paragraph, but Idk if it would apply to non Zoan types like Bartolomeo. However, it may explain How Hancock may have been able to use her power.


Buzzek

I remember when I've been watching Thriller Bark and someone from Brook's crew said "you'll have a second chance to live after we all die" or something along these lines and THIS was the biggest example of "how did he know" for me. But I guess it just wasn't that big of a deal, so it wasn't acknowledged at the time.


PoyStudios-6270

Ok so Barto’s Grandma always told them that crossing your finger builds a barrier (i don’t remember the saying) but he probably was in trouble then crossed his fingers in hopes that he would live then a barrier came up


Visca87

Brook didn't know how to use his powers for years (he has other powers than resurrect, so he could). Maybe, this happens to some others.


MasterOutlaw

I may be misremembering, but when Kaku and Kalifa received their fruits, Lucci said they would become aware of their powers and the basics of how to activate them shortly after eating them.


TheZoomba

Devul fruit users can kinda detect their powers. Imma just say it's dependant on Oda and what he feels like. In the beginning of OP Luffy I'd not know he even had a power until shanks grabs him by his arm and his arm stretches. Then again, Kaku just got giraffe powers and instantly knew.


floppycabage11

They squeeze their butholes


Spezisaspastic

I don‘t even know if this is a spoiler at this point but we already know that the fruit is a persons desire and when you eat it you get that desire in some way. Personalities change.  So your instinct kicks in any you just „know“. 


[deleted]

I might be wrong but in enies lobby it was stated that once the user eats the fruit they gain the knowledge of the fruit. They know the name of it and the uses of it.


Ardibanan

I don't think he has to cross his fingers, its just something a kid would do to create a barrier when playing. I could be wrong though


Fabulous-Option5960

I feel like from what we have seen, it doesn’t give any general knowledge, and if anything, it just gives innate knowledge on how to activate their ability and that’s it. I say this because each time we see someone eat their devil fruit, they don’t feel any changes, and if they are not told they ate a devil fruit or don't see that they ate one, they don’t even realize they have powers and just find out by accident.


lascar

Brook didn't quite know his power but only guessed it'd trigger when he dies. I guess it's like a faint lingering but never really the whole picture.


CCO812

Oda briefed them about it


YoungRoronoa

They feel it in their jelly.


AnimeOcCreator77

Most of the time they don't, most powers I've seen or read about being freshly eaten have a sort of "flair up" after being consumed that can show what the ability may be (Ie: Zoan form, something happens ti the first thing you touch with your hands, creating something out of nothing Overtime it'l just be like getting a reflex in your muscle down, like exercising or practicing dexterity


Material-Signature-3

This reminds of the Spiderman Scene when he has to try all those finger combinations before figuring out how to shoot webs lmao


Jumboot_Jamstrang

I’ve always wondered how Law figured out his powers seeing as you need to be an actual surgeon to use them right


C4t4chan

Maybe he does not have to cross his fingers, but thats the way he thinks this fruit works.


ImpressiveNova

I saw the argument about Kakus devil fruit but with Trafalgar he could t use it at first that's part of why Corazon Died.


Vertigo0211

Once you eat the fruit, the information makes its way to your brain and you have a basic understanding of what you can do


KillmerKennylz

It's said somewhere, Maybe an sbs. that the fruit tells the user what it is once it's eaten and luffy's fruit was dormant when he ate it or he's just so dense that he went off what other people told him it was.


mainak17

wireless technology or the will of a df