Veruca Salt- Willy Wonka and the Chocolate Factory
Veruca Salt is less evil, more of a result of privilege spoiling a person. It's funny how the majority of these individuals wouldn't be evil if it weren't for their extreme wealth and lack of care for others built by competitive capital. Veruca Salt is just a child, but she's falling down a dangerous path, which gets quickly adjusted when she turns into a Blueberry at the end of the film.
Ursula- The Little Mermaid
Ursula is evil, vengeful, and flat out plagued by jealousy, which causes her to act like a jerk to Ariel. She is jealous of Ariel's beauty, her power, and her position of being a member of the royal family. Much like other fairy tales, Ursula is a demonic, Devil like figure that convinces the protagonist of one thing, while making sure they're oblivious of the consequences, which is truly despicable.