Because you like Unnamed in Fight Club
Elio Perlman likes the piano, peaches, and his father's new research assistant a little too much. See them in Call Me by Your Name.
Mr. Blonde is the undisputed leader of his pack of suited-up outlaws, with a stoic and serious demeanor, and a penchant for bloodshed. See them in Reservoir Dogs.
You wouldn't know it by looking at her, but beneath Sheila Jackson's sweet, motherly exterior lies a sex addict. See them in Shameless.
This lab mouse has one thing on his huge brain: trying to take over the world on a nightly basis. See them in Pinky and the Brain.
Intelligent Adele is soft spoken yet brimming with emotion. See them in Blue is the Warmest Color.
Don't ask the ruthless queen of the Tokyo underworld any questions unless you're fine with losing a limb. See them in Kill Bill vol. 1.
Sideshow Bob is a bitter ex-performer who was forced to do inhumane stunts for slapstick comedy. Now he's exacting revenge on his former boss, a clown. See them in The Simpsons.
The self-described "ghost with the most" knows the ins-and-outs of specter life like no other. Just ask him. See them in Beetlejuice.
Donna Pinciotti is strong, independent, and empathetic. No one messes with her. See them in That '70s Show.
Daria Morgendorffer is so defensive that she actively works to make people dislike her so that she don't feel bad when they do. See them in Daria.