Hero too dumb to be evil
So I have been coming up with character idea just throwing everything to see what I could come up with, here is what I got
A child raised by loving parents for a few years, gets kidnapped and taken by cultists who kept prisoners drugged up to idiocy, when a group of paladins attacked the cult the kid now an adult grabs the sword the cult had worshipped. The sword was made by a powerful fiend to corrupt the mind of the wielder, however that was with thought the wielder would be intelligent. Thus the sword can't corrupt them and it is cursed so they can't lose it.