He has a humanoid robotic appearance and is a bit taller than Ultimate Humungousaur. He has a green and white body with large cylinders on his arms and near his wrists, that are full of a green liquid with dark green spheres, these spheres are constantly moving. He has a head that is similiar to Egghead's head(from the Ant Man comics) but thinner and is a armored helmet. He has the same liquid on his Omnitrix or peace symbol-shaped chest.
Nuclear Winner: A massive blast of energy that can easily knock out Negative Ultimate Spidermonkey along with other enemies and devastate the surrounding areas.
Atomic Energy Blasts/Balls: He can create atomic blasts from his hands. The way he creates the blasts is by chanting "HAA-MEE-NA HAA-MEE-NA HAA-MEE-NA!" but he does not have to chant every time he does a attack but does so for some attacks so he can focus his power. The blast is capable of destroying most of it's surroundings.
Heat Generation: He is able to activate the Omnitrix/peace symbol on his chest and the cylinders on his arms to melt nearby objects, such as Ultimate Spidermonkey's Webs.
Energy Formation: He is capable of creating energy
In another timeline, Atomix was first mentioned in the original series episode Ken 10 as one of Ben 10,000's aliens. To Ken's disappointment, it was not one of the aliens in his Omnitrix given to him by Ben.
He is seen in the new advertisement for the new season of Omniverse.
The way he charges his powers is based on Goku's Kamehameha chant from the series Dragon Ball, but the chant sounds something like the "Homina Homina Homina" exclamation of Ralph Kramden from "The Honeymooners".