Atomix is a humanoid nuclear energy-based life form inside a containment suit which boosts his abilities. His body is made up of bones that are covered with nuclear energy. The containment suit has a mask with two grey nodes, a black suit that covers his torso, neck, and most of his head, with two holes on his neck and one big hole on his torso. His shoulders and upper arms are covered with armor which forms two holes on his pecs with green fins projecting on each side above his collarbone and has one reactor on each shoulder. His biceps are made up of mechanical elements that exchange energy between his shoulders and lower arms which are connected on the back of his upper arms. There are two smaller reactors on his forearm and a green metal ring with rivets. The thighs and parts of his pelvis are covered with his containment suit with two green stripes on his thighs which are connected by tubes to his knees. The lower leg is contained in his containment suit with two holes on each side. His feet and knees are entirely mechanical.
The Omnitrix symbol is located on his waist.
- Nucleokinesis- Atomix can generate and manipulate nuclear energy using his hands, which can do an extensive quantity of destruction to its surroundings.
- Heat Generation- Atomix is able to melt nearby objects using the heat from his nuclear energy.
- Nuclear Immunity- Atomix, being an alien that produces nuclear energy naturally, is immune to the effects of said energy.
- Enhanced Physicality- Due to his advanced and heavily built containment suit Atomix's strength, speed, and durability are vastly superior to many of Ben's other transformations.
- Flight- Atomix is capable of flight, even being able to travel in the vacuum of space.
- Transmutation- Atomix can manipulate and alter the matter of an opponent using his nuclear energy.
- Space Survivability- Atomix can survive in the vacuum of space.
- Atomization- Atomix can atomize his opponents with his nuclear blast.
- Radioactive- Atomix can release and sense alpha, beta and gamma particles.
- Containment Suit- Atomix wears an advanced containment suit that strengthens his abilities.
- Overexertion- If Atomix uses too much of his energy, he can grow weary.
- Overconfidence- Atomix is boundlessly overconfident and can induce an utter meltdown.
- Prypiatosian-B- Atomix's cousins the Prypiatosian-B tend to feed on Prypiatosian-A nuclear energy to survive.
- In Chapter 6: Weightless, Ben considered transforming into Atomix to contain the collapsing Dwarf Star, but decided against it due to already being transformed as NRG.
- In Chapter 8: Risen, with no other choice, Ben activated the Powerhouse Playlist and transformed into Atomix to fight against Planet Buster.
- In Chapter 10: Again, Atomix is seen in a flashback of an alternate timeline alongside Danny, Clockwork, and Professor Paradox battling Divinity.
Atomix's race are the Prypiatosian-As from the planet Prypiatos. The Prypiatosians used to have the most industrious mega cities of the Andromeda galaxy. Due to an unspecified conflict, however, atomic war broke out. The entire surface of the planet was irradiated and almost overnight it started to affect its inhabitants, creating mutations resulting in two notable subspecies: the Prypiatosian-As and the Prypiatosian-Bs.
To avoid further genetic damage some citizens moved underground and rebuilt their prosperous society, this time with a protective layer of lead surrounding it to keep back any radiation from leaking in. However, these Prypiatosians were still receiving some low levels of radiation which were just low enough so that their DNA was able to adapt to it as fast as it was mutating, resulting in a new species that can manipulate energy. After a few generations of it being hardwired into their DNA, they now need it to be sustained and adapted to be able to generate it, creating their own independent source. These Prypiatosians became the Prypiatosian-A subspecies.
- As a subspecies of Prypiatosians, he is genetically linked to NRG.
- While NRG's containment suit is meant to suppress his powers and protect those around him, Atomix's containment suit is meant to amplify his powers for a combat-heavy experience.
- Atomix's 5YL design, especially his upper arms, was inspired by the robot designs that appeared at the start of the episode "The Galactic Enforcers", in the original Ben 10 series.