Pro tip; Cherish Shinji and use him as often as you can, not even for gameplay reasons... but just because he's best boi and deserves it. If you do need a reason, he's pretty OP for the time you have him as a bloodthirsty crit demon. He doesn't need lvl 99. Spoiler Alert: I made this comment to spite the asshole saying otherwise. Just enjoy using Shinjiro for all the time you can. 💖