Because you like Violet Crawley in Downton Abbey

Given his ability to wrench street signs from the ground, Shizuo Heiwajima is a useful one to have in dangerous Ikekuburo. See them in Durarara!!.

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.