Gluto

From Wikitrix

Pilot of the Resolution, Tetrax's ship, Gluto is a slime-based lifeform that appears in Ben 10: Secrets of the Omnitrix. Gluto can shapeshift to a degree, which comes in handy when piloting a ship that requires at least three arms to run properly. Gluto wears a suit that allows him walk on legs for better mobility. His only naturally distinct features are his three eyes and two antennae-like tentacles.