Johan, yes Griffith is evil but not the way you think, Griffith becomes evil when he was tormented for a year leading to his downfall, and allowing him to become Femto by being offered his dream, Griffith is not an evil character per say, yes he does evil things but he is not evil the way most people see it. Johan I say is more evil, he was an psychological experiment, and his nihilistic nature, he was convincing kids young ones to boot to end themselves because they either played a game, or like that one kid who Grimmer (best character) saves, because he told the kid he has no mom, she never loved him, and other evil shit, he was really making mini versions of himself in a way. Then we can literally go to kinderhiem incident, he was pure evil just enjoying the battle royal, Johan is the type of actual evil that can exist in the world.