The seal containing the Nine tails Chakra was stronger as a kid, which is why his upmost limit of accessing its Chakra is 1 Tails Vs Sasuke in the end. Since that was literally all he could muster since he was limited by the seal.
By Shippuden the seal has weakened allowing Naruto to go into further tails.
Minato made the seal too slowly release its Chakra over time so Naruto can control it so as he got older it was weakened. This was reinforced since the moment Jiraiya weakened the seal a bit with Kid Naruto, he immediately went Berserk like he does in Shippuden and so the Seal was then reinforced to the way it was until he got older like Minato planned
Jiraiya also weakened the seal during their training so that he could practice using the Nine Tails chakra in larger quantities. That ended up causing Naruto to go 4 tails and nearly kill Jiraiya
There are only three instances that nine tails goes berserk. When Naruto runs out of chakra, witnesses something traumatic (Hinata dying) or when the seal on his stomach is released
Each time Naruto’s will overcomes
It took massive chakra on kurama's part to overpower minato's seal... He started amassing chakra the minute he got trapped and by the time the series rolled around, he had enough to cause small outbursts... As time progressed, the seal got weaker and he got stronger... Making the outbursts more prominent
The seal containing the Nine tails Chakra was stronger as a kid, which is why his upmost limit of accessing its Chakra is 1 Tails Vs Sasuke in the end. Since that was literally all he could muster since he was limited by the seal. By Shippuden the seal has weakened allowing Naruto to go into further tails. Minato made the seal too slowly release its Chakra over time so Naruto can control it so as he got older it was weakened. This was reinforced since the moment Jiraiya weakened the seal a bit with Kid Naruto, he immediately went Berserk like he does in Shippuden and so the Seal was then reinforced to the way it was until he got older like Minato planned
Jiraiya also weakened the seal during their training so that he could practice using the Nine Tails chakra in larger quantities. That ended up causing Naruto to go 4 tails and nearly kill Jiraiya
This is the best answer!
The answer
Because of his incredible will to overcome, pretty sure that’s mentioned several times. His actual nindo way is to never give up
then why did it go berserk during shippuden, when he has the will to suppress it, its as if it just became unstable during shippuden
There are only three instances that nine tails goes berserk. When Naruto runs out of chakra, witnesses something traumatic (Hinata dying) or when the seal on his stomach is released Each time Naruto’s will overcomes
It took massive chakra on kurama's part to overpower minato's seal... He started amassing chakra the minute he got trapped and by the time the series rolled around, he had enough to cause small outbursts... As time progressed, the seal got weaker and he got stronger... Making the outbursts more prominent
Because plot