Nanomech

Nanomech first appeared in the live-action movie Ben 10: Alien Swarm, when the Omnitrix absorbed the DNA of the Alien Chips.Nanomech live in hive planet and his species is nanomechion .Nanomech is about a millimeter tall, can shrink and grow larger, has green wings, as well as one large green eye, carbon/silicon-based mechanical body, and triangular three-pointed feet. He is also the alien used to destroy the queen of the hive. The Omnitrix symbol is on his chest. Kevin describes Nanomech as "not like anything Ben has turned into before." This is because Nanomech is part drone, part human, and he's a hive mind-based organism. Nanomech is a unique creation of the omnitrix, a fusion of the biomechanical DNA of the alien chip with Ben.

He will finally make his first cartoon series appearance in Ben 10: Ultimate Alien. His appearance has changed as his legs are thinner, has boot-like feet, his neck and shoulders have also changed and there aren't as many wires on his body, probably because the live-action movies make the aliens in the animated series more detailed. He is 1 of the 12 aliens in Ultimate Alien.

Abilities
Nanomech can fly, can shrink to microscopic size, he can grow to human size, produce wire-like tentacles from his back, and fire green electricity from the tentacles and his hands. He is also shown to adapt to any enviroment he's in. When Nanomech is touching someone, he can shrink them too. He is noticeably more humanoid than the other drones (possibly an Omnitrix modification, as it alters DNA in order to achieve the form of a new species, and may have fused the cybernetics of the drones with Ben's own DNA in order to transform), and The Queen added he was stronger than the others. Note: When Ben transforms into Nanomech, he shrinks, then his Nanomech skin covers his body. It is currently unknown why this happens. This is different from Grey Matter from which he changes then he shrinks.Also note that he might have regenerating abilites.