Because you like Danny Ocean in Ocean's Eleven

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

After becoming accepted into the group of popular girls, Tracy Freeland has turned from a sweet and reserved teenager into a monster. See them in thirteen.

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.