Because you like James P. Sullivan in Monsters, Inc.
A few millennia in the mortal realm have caused DEATH to be quite enamored of life. See them in Discworld.
Yuki Cross is a cheerful, funny, bold young woman with hidden insecurities. See them in Vampire Knight.
She's a survivor of gunshots, of being buried alive, nand of paralysis. And now Beatrix Kiddo is going to make her abusers pay. See them in Kill Bill vol. 1.
Oliver Tate is extremely articulate but hopelessly awkward. That's not a recipe for teenage happiness. See them in Submarine.
Killua Zoldyck is so tired of killing. He just wants to be a kid, hanging out and doing stuff with his friends. See them in Hunter x Hunter.
A super-soldier, Master Chief might be more machine than man. And for humanity's sake, thank God. See them in Halo.
Although Morrigan knows every kind of magic there is, friendship is an untested area for her. See them in Dragon Age Series.
Remy Hadley is a closed book—a cynical, super-smart closed book. See them in House M.D..
Harry Mason has been told that he worries too much, that he's a little paranoid. But he just wants to protect what he loves. See them in Silent Hill.
Most of the world has been wiped out from The Beast. And when The Beast comes, Cole MacGrath will be ready. See them in inFAMOUS.
Francis Freeman may be impervious to pain, but he sure knows how to inflict it. See them in Deadpool.