Because you like Oskar in Let the Right One In

Castiel might be an immortal angel, but the human world is still more than a little confusing. See them in Supernatural.

A daring conman, Flynn Rider is so charismatic that you might not mind when he steals from you. See them in Tangled.

A wildly brilliant detective, Sherlock Holmes can figure out everything except how to interact with other human beings. See them in Sherlock.