Because you like Bill Cipher in Gravity Falls

The destroyer, Drax lives for one thing and one thing only: revenge. See them in Marvel Cinematic Universe.

This barber doesn't cut hair. Sweeney Todd sends his clients down a chute to be baked into his partner-in-crime's pies. See them in Sweeney Todd: The Demon Barber of Fleet Street.

Moana is brave, adventurous, and dutiful. And with the ocean on her side, there's no telling how far she'll go. See them in Moana.

Born and raised in the darkness, Bane is determined to have the city totally under his control so that he can demolish it. See them in DC Extended Universe.

One of Freddie Mercury's songs is "We Will Rock You." And does he ever! See them in Bohemian Rhapsody.

Roger is a pansexual alcoholic non-human who will happily lie, cheat and steal to get what he wants. See them in American Dad!.

Mavis Dracula's interests are anything black, scream cheese, and flying around. See them in Hotel Transylvania.

Morticia Addams hates anything bright and cheery and loves all things ghoulish, ghastly, and violent. See them in The Addams Family.

Cyclops shoots lasers out of his eyes, destroying anything in his line of sight. See them in X-Men Series.

Megamind is searching for purpose in a supervillain life without a superhero to fight. See them in Megamind.

Others see him as the town nutcase, but Flint Lockwood knows his inventions will change the world someday. See them in Cloudy with a Chance of Meatballs.

Dewey Finn will rock you. He feels rock and roll in his blood and guts. See them in School of Rock.