Original name: NRG
Faname: Furnace/Pandora

Obs: My version of the omnitrix recognizes her animal DNA and make her aliens look like animals too, like cats for example. This is important to tell.

This one wasn't so hard, I decided to make the armor look more humanoid so the armor would not be the exact same.
NRG is a radioactive alien capable of feed of pure energy to make it bigger and stronger.
It's said NRG (originally named P'andor) was a criminal, so dangerous that he was sealed in a super hard armor. Ben scans the alien and the omnitrix it makes an armor for safety of everyone nearby, but ben can still use the powers.
In omniverse, NRG have a handle on the head to easily leave the armor, and also a suit for the alien inside to prevent his dangerous properties to harm the others close and also prevent Ben from starting an feeding frenzy (as far as I know).