Because you like Rhett Butler in Gone with the Wind

Maddy Perez seems like an angel until she opens her mouth. See them in Euphoria.

More than any of her friends, Fluttershy is willing to see the best in everyone, a trait that has won over many enemies. See them in My Little Pony.

He's the great Black Star, and he's come to assassinate you. See them in Soul Eater.

Level-headed Ian Gallagher may be focused on his goals, but he's got a mischievous side too. See them in Shameless.