Eunice

Eunice, otherwise known as the Unimatrix, is a living prototype Omnitrix created by Azmuth. She can absorb and contain DNA of various different species and use their abilities. She is a close ally of Ben's team and currently works as Azmuth's system.

History and origin
While still in her Unitrix form, her pod crashed into Earth and was discovered by Ben, Gwen and Kevin. When Gwen touched the pod, it cut her hand and sampled her DNA, randomized and created Eunice. This made her somewhat a genetic copy/clone of Gwen only that her hair was blonde, explaining why she has blonde hair instead of red/orange. The pod then opened to show a beautiful, and completely naked blonde girl, that of which became Eunice.

Eunice later gained consciousness, and Ben gave her his jacket to cover herself so she wouldn't be seen naked. They went to the forest and asked her who she was, but she couldn't remember anything only that her name is Eunice. She and Ben started to bond very quick and started liking each other (remember, Ben recently broke up with Julie until later on in Season 2). She went back to the car with Gwen to give her some proper clothes (a simple pink tank top, white pants and sandals).