Because you like Bill Cipher in Gravity Falls

Reckless, vulgar, loud-mouthed: that's what makes Amethyst so awesome. See them in Steven Universe.

This bite-sized, power-hungry plankton is determined to uncover the secret recipe for the Krusty Krab burger. See them in SpongeBob SquarePants.

Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.

The Ice King is lonely and looking for a princess to sweep him off his feet. See them in Adventure Time.

Garnet is a Crystal Gem who'll protect her friends with her life. See them in Steven Universe.

Scar is sneaky, snarky, and always striving for more power. See them in The Lion King.

Just because he rules Hades, doesn't mean he can't be fun! See them in Hercules.

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.

Mother Gothel is a great mother as long as you never, ever, break the rules. See them in Tangled.

A short-tempered guy, Bowser is determined to wreak havoc on the Mushroom Kingdom. See them in Super Mario Bros..

A karate master/rocket scientist/squirrel, Sandy Cheeks is the only one who can clean up the other resident's messes in Bikini Bottom. See them in SpongeBob SquarePants.

Anger is a cantankerous hothead whose job is to get others riled up. See them in Inside Out.