Why do some people seen to like the "evil" characters a lot more than the hero or good characters?

My friends love evil characters. They like some good but evil they like. Like for example, Sleeping beauty, one of my friends liked Malecifent. And in Hercules, my other friend likes Hades. I dont like evil characters at all. I wish there were non of them at all. That would be intresting. Why do people like them ever so much?