I haven’t watched much anime, but I really liked Insatiable Berserk.

Briefly: a weak guy with the ability of gluttony entered the service of the castle. From his ability he only had hunger, but he did not know that hunger did not come from food, but from killing and absorbing the ability of the killed. This is of course a good plus of the ability, but the minus is that once you try there is no way back, and your appetite grows more and more each time. that is, he is becoming stronger and stronger than everyone else, and where will it lead him while we look.

In a word, from rags to riches