Because you like Louisa Clark in Me Before You

Violet Harmon takes teen angst to a paranormal level. See them in American Horror Story.

A crabby troll, Karkat Vantas is perpetually angry about his lot in life. See them in Homestuck.

GLaDOS will supply the food when you get together: a delicious cake. Of course, it could just be a trap so she can kill you. It’s hard to say. See them in Portal Series.

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

This power-hungry Time Lord calls himself the "master of all." Bonus: he has 13 lives. See them in Doctor Who.