Because you like J. Edgar Hoover in J. Edgar

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 dreamy space cadet, Luna Lovegood has never met a conspiracy theory she didn't believe in. See them in Harry Potter Series.