Well Braveman in One-punch man there are lots of people like this.
Zero Do-T2!!!"Zero duty, too"—as in not even getting giri (duty/obligation) chocolateStray MonsterAh! Our chocolates!!The accumulated negative feelings have suddenly mutated me into the monster...What kind of reason for mutation is that...?A person who was suddenly mutated into a monster due to some spontaneous reason.They are generically referred to as monsters, due to their hostile behavior toward society.Today is the day... when I will consume all of the chocolates in the world...!W-Who are you!?You...My great self has never received a Valentine's chocolate in his life!!...are a Stray Monster...!