So, I've seen anime (s) and read manga (s) where the MC is a normal person or an abnormal person in the beginning in terms of powers but in the end, or later, kaboom- and they've some dark secret to them which makes them super strong n awesome, cool.
D. Gray man- Allen
Owari no seraph- Yu
Pandora Hearts- Oz
Black Clover- Asta
Naruto- (not really but ok)
Fairytail, one piece etc.

So I really like this dark power+ mystery MC+ cool bros + that one trait of MC which stands out.
So I really want some recs. Plz help an otaku.