Beerus

Beerus is an cat-like alien from the Dragon Ball world that will become an enemy to Kari & her friends. He wants to kill Kari and her friends because of something they will do to him in the future.

Personality
Beerus hates human children as seen when a prophecy is revealed to Beerus that Kari, her friends, and their allies will group together to defeat him. He wants to kill all of them before that happens.