Chimera Sui Generis

Chimera Sui Generis, also known as Chimerans or Vilgaxians, are a species from the planet Vilgaxia.

Anatomy
Chimera Sui Generis are a green-skinned humanoid species with long squid-like tendrils on their heads. Most females have them on their head, while males have them on their chin or all around their head to resemble hair or beards, respectively.

Powers/Abilities
Chimeras have incredible strength, agility, and durability. They can project powerful laser beams from their eyes, though only Vilgax and his genetic copy Gax have displayed this ability.

Chimeras have the ability to transform into large octopus-like creatures at will, though it would likely be useful only in water-based environments. They also have shapeshifting arms that can transform into powerful tentacles.

Chimerans are possibly quite intelligent, as Myaxx was one of Azmuth's assistants and helped him make the Omnitrix and the cloaking field for Xenon. Meanwhile, Vilgax displays high levels of expertise with the Omnitrix and has vast army of drones that he may have built himself.

Chimerans can to speak to and through their own DNA, which was allowed Vilgax to talk to Upgrade when he was merged with Rojo.

Omnitrix Transformation
The Omnitrix's Chimera Sui Generis representative is named Gax, who first appeared in the reboot episode "Omni-Tricked: Part 1".

The Omnitrix from the original Ben 10 continuity contained Chimera Sui Generis DNA obtained from Vilgax. However, Ben Tennyson was unable to discover this form because the power surge on the Chimerian Hammer removed the DNA sample from the Omnitrix during the original series episode "Secrets". While Ben wore the original Ultimatrix, it did not contain Chimeran Sui Generis DNA.