Because you like The Man with No Name in The Good, the Bad and the Ugly
With her consciousness so easily shifted between bodies, Motoko Kusanagi is left unsure of who or what she really is. See them in Ghost in the Shell.
Christian is a romantic who for some reason won't stop singing everything he feels. See them in Moulin Rouge.
A machete-wielding mass-murderer, Jason Voorhees is a terrifying blank slate. See them in Friday the 13th.
Sarah Kerrigan is pretty much the Queen Bitch of the Universe. See them in StarCraft .
George Costanza is short, stocky, bald, neurotic, and the self-proclaimed "king of the idiots." See them in Seinfeld.
Edmund Pevensie isn't a bad person, but he did sell his siblings out for a tin of Turkish Delight. See them in The Chronicles of Narnia.
For Wreck It Ralph, it's not easy being the bad guy. Especially when you've been designed to destroy but really desire love. See them in Wreck-It Ralph.
Krusty The Clown somehow makes life sillier and more somber at the same time. See them in The Simpsons.
A scary monster on the outside, James P. Sullivan is really a softie on the inside. See them in Monsters, Inc..
With most of the people that Sango loved now gone, the only thing she wants is to kill the demon who destroyed her village. See them in Inuyasha.