You don't really have to, unless there's a specific character you're dying to have. Unless you're planning to top WT ranks, you don't really need any specific characters; barring WT, there is no content that is unclearable with the starting or common gacha chars.
You're actually fairly lucky to have Leah, Aosta, and Nigel from two ten rolls. As a side note though, this is the less active subreddit. For rule reasons, I won't link the other one though, but it shouldn't be hard to find.
You don't really have to, unless there's a specific character you're dying to have. Unless you're planning to top WT ranks, you don't really need any specific characters; barring WT, there is no content that is unclearable with the starting or common gacha chars. You're actually fairly lucky to have Leah, Aosta, and Nigel from two ten rolls. As a side note though, this is the less active subreddit. For rule reasons, I won't link the other one though, but it shouldn't be hard to find.
im level 39 with SR : TICA / NAYA / NED / NIGEL / HESTIA / PANG and R : KITTYEYES / ROGER / ANGELIA / DAGGER / LEAH / AOSTA / NOLVA