Because you like Victor Frankenstein in Frankenstein
Helena is a mentally unstable, childish, and completely merciless. And most of all, she's an unstoppable killer. See them in Orphan Black.
Freddie Freeman is a superhero aficionado with a dark sense of humor. See them in DC Extended Universe.
Michael Moscovitz is a high school student of few words but a lot of heart. See them in The Princess Diaries.
Vanellope von Schweetz is princess of the Sugar Rush game who could care less about being royal. See them in Wreck it Ralph.
Jessica Rabbit isn't bad. She's just drawn that way. See them in Who Framed Roger Rabbit.
A malevolent dark wizard, Voldemort is so fearsome that he's known primarily as "He Who Must Not Be Named." See them in Harry Potter Series.
The Genie is the perfect buddy, granting every wish we might have and keeping life good-spirited. See them in Aladdin.
Miss Havisham is the creepiest old rich lady in town. See them in Great Expectations.
The last war left his economy devastated, and now Germany is engaged in another war and stuck with two barely trained allies for help. See them in Axis Powers Hetalia.
Mavis Dracula's interests are anything black, scream cheese, and flying around. See them in Hotel Transylvania.
It's impossible to say whether Winifred Burkle is cuter than she is smart, or vice versa. See them in Angel.