Because you like Christine Campbell in The New Adventures of Old Christine
Smart and sensitive Sam Winchester tried to escape the family business, but ghosts have a way of haunting you. See them in Supernatural.
His murderous megalomania aside, Loki is quite charming. Just don't mention his strapping older brother; he's a tad jealous. See them in Marvel Cinematic Universe.
A daring conman, Flynn Rider is so charismatic that you might not mind when he steals from you. See them in Tangled.
Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
Both intelligent and empathetic, Remus Lupin is worn down by the weight of a secret. See them in Harry Potter Series.
A wildly brilliant detective, Sherlock Holmes can figure out everything except how to interact with other human beings. See them in Sherlock.