Bromeba is a green amoeba-like alien. He has hairs coming out of the sides of his forehead. He has wrinkles under his eyes and wears a regular Plumber Suit, but he lacks hands and feet so the sleeves end in snags.
An alternate timeline version of him appeared in And Then There Was Ben.
Ben 10: Omniverse
- Outbreak (first appearance)
- The Frogs of War: Part 1 (cameo)
- A Fistful of Brains (cameo)
- And Then There Was Ben (alternate timeline; cameo)
- The Final Countdown
His name is a portmanteau of "bro" and "amoeba."