Watagash

Watagash was a tiny, cotton ball-like parasite that had been captured by the Galactic Patrolman Jaco. While Jaco stopped for ramen, Watagash escaped and fled to Earth, where he began searching for hosts driven by negative emotions.

His first host was a bank robber, who gained enough power to challenge Gohan in his Great Saiyaman persona before being defeated with a single kick. Watagash then latched onto Barry Kahn, an arrogant movie actor who harbored intense jealousy toward Gohan. Using Barry's hatred as fuel, Watagash transformed his host through multiple stages, each more monstrous than the last.

In the final stage, the Barry-Watagash fusion became a towering creature powerful enough to overwhelm base Gohan. However, Super Saiyan Gohan defeated the monster with a Super Kamehameha, deliberately holding back to avoid killing Barry. Watagash was separated from his host and presumably recaptured. His name is a play on "watagashi," the Japanese word for cotton candy.