Post anime character that have been cursed but use it as a power to save himself or world.Thanks...

Rika Furude from Higurashi is cursed to relive the last days of her life again and again. Still she tries to use it to change fate and save everybody.

Miroku from Inuyasha

Some characters have vampiric curses, yet use it to help mankind, like the half vampire D. D is also cursed with a parasite on his hand that swallows up curses to save his own skin.