Because you like A.C. Slater in Saved by the Bell

Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.

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

L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.