Atrocian

Atrocians are a small fat blob-like alien species from an unknown planet.

Anatomy
Atrocians resemble anthropomorphic potatoes covered in warts with short and stubby limbs.

Although Atrocians are traditionally yellow, they can come in other colors, including pink, blue, purple, and green.

Powers/Abilities
Atrocians are extremely durable, making them immune to physical and energy attacks, heat, and acid.

Weaknesses
Atrocians do not appear to be built for combat, and are effectively punching bags for other beings as a result.

Society
The Atrocians are unable to clean up after themselves, so their Insectoid neighbors evolved as a natural sanitation solution to the Atrocians' garbage problem.

Omnitrix Transformation
The Omnitrix's Atrocian representative is named The Worst, who first appeared in the Omniverse episode "Outbreak" when Blukic and Driba tried to repair the Omnitrix. The Worst solely appears in Omniverse.