Onion

 is a minor character in Steven Universe. He appeared in "Bubble Buddies" when Connie and Steven needed a harpoon gun to destroy the bubble in which they were trapped. He seems quite young, as he is smaller than Steven and apparently cannot talk. He can read, though, and knows how to operate a harpoon gun.

Appearance
Onion is a fair-skinned boy with a small tuft of blonde hair and a slightly chubby face. He wears a white shirt, a blue shirt tied around his neck, and red pants. His most recognizable trait is his onion-like head.

Personality
Onion is mute and possibly deaf, but eager to help. He will blindly follow orders even if they don't seem very well thought out.

Steven Universe
Steven is Onion's friend whom he is eager to help and has known in the past.