Because you like Voldemort in Harry Potter Series
Thanos is an intergalactic warlord, on the hunt for infinite power. See them in Marvel Cinematic Universe.
Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.
Mother Gothel is a great mother as long as you never, ever, break the rules. See them in Tangled.
A monstrous pirate captain, Davy Jones is quite literally heartless. See them in Pirates of the Caribbean: the Curse of the Black Pearl.
Anger is a cantankerous hothead whose job is to get others riled up. See them in Inside Out.
White Witch's heart is as frozen as the land she rules. See them in The Chronicles of Narnia.
Ultron is security software turned evil mastermind. See them in Marvel Cinematic Universe.
The Grinch's heart is just too small to appreciate Christmas. See them in Dr. Seuss' How the Grinch Stole Christmas.
This bite-sized, power-hungry plankton is determined to uncover the secret recipe for the Krusty Krab burger. See them in SpongeBob SquarePants.
A cruel pirate, Captain Hook still fancies himself a gentleman. See them in Peter Pan.