Armodrillo

"Or better yet, let me break it up for you!" - Armodrillo in The More Things Change: Part 2  

Armodrillo is a Talpaedan from the planet Terraexcava in the Andromeda Galaxy. He was obtained when Ben scanned Andreas in the Ben 10: Ultimate Alien episode Andreas Fault. He first appeared in Hero Time where he helped Captain Nemesis defeat some robots. He reappeared in the second Ben 10: Omniverse episode The More Things Change: Part 2 where he defeated Psyphon's lackeys before getting poisoned by Psyphon. Armodrillo was voiced by Dee Bradley Baker in Ultimate Alien, but was replaced by John DiMaggion Ben 10: Omniverse.

Gutrot

"But hey, my gas is just as good as your gas" - Gutrot in Animo Crackers

Gutrot first appeared in the Ben 10: Omniverse episode Animo Crackers where he defeated future and present Animo. His was first used by Nega Ben in the episode And Then There Were None, where he fought against Build-A-Guy. Gutrot is voiced by Rob Paulsen. His abilities and appearance is based on the Pokémon Koffing, Derrick Wyatt's favorite Pokémon.

Appearance

Gutrot is a bulky humanoid alien that wears a green hazmat-like suit. He has a window that shows his gassy innards on his stomach. He has large four fingered hands in white gloves and has nozzles on his shoulders, arms, head, back and backside. He wears the Omnitrix symbol on where his mouth would be in a fashion similar to a gas mask.