Board Thread:Manga Discussion/@comment-28702329-20180621120402/@comment-27885372-20180923020142

Well, every of them need mental help. We can't really say who is eviler since they all add their amount of problem in their life.

Based on act tho, we could say the worst is DIO, who could kill anyone since he doesn't like anyone. (Apparently because his dying mother did care for him and that she said to him he was the most marvelous being in the world (which every mother say to their child btw but since he had a particulary hard childhood it's understandable))

Kira is probably the less because he did wanted to stop. But his body forced him to do it. It's actually pretty sad and i think he could have met a different fate.

Diavolo is at the same level than DIO but without apparent motivation, which make me think he is worst. At less DIO care about his family (without counting drunk dad, he even started to like Jonathan...)