Eunice

Eunice aka The Unitrix is a female "Human" from The Transmogrification of Eunice. The Unitrix is a prototype Omnitrix which can absorb alien DNA in the device separately one for each species intended to store the DNA in separate containers. Unlike the Omnitrix and Ultimatrix, this has its own life (Eunice). The Unitrix can only store the DNA of one species, as Azmuth stated he intended to originally have a separate Unitrix for each species. Ben had a big crush on her.

Backstory
She is the Unitrix created by Azmuth, which is a prototype of the Omnitrix. Sunder was hired by Azmuth to recapture her. During the scuffle with Sunder in a muddy area, Azmuth arrived and cleared things up. He stated that Eunice was actually a Unitrix, a prototype of the Omnitrix when Azmuth wanted to preserve alien DNA. Following a brief argument, Ben allowed Azmuth under a compromise to take Eunice with him as one his his assitants as azmuth stated he can use a hand on taking care of Primus.

Azmuth states that when Gwen touched the pod containing the Unitrix, her human DNA was absorbed, and then randomized (which explains why she has blonde hair) creating Eunice's humanoid body.

Appearance
Eunice's mobile form is a beautiful teenage human girl. She has shoulder-length blond hair with a single bang, and bright green eyes, like Ben and Gwen. When they first found her, she was completely nude, then she wears only Ben's bright green long-sleeved jacket. Then Afterwards she dons a pale pink tank top, white shorts, and brown flipflops, which she borrowed from Gwen.

In her technology form she is the Unitrix, a core similar to the Omnitrix and Ultimatrix.

Powers and Abilities
As a prototype Omnitrix, the Unitrix (and therefore Eunice) is capable of storing and recalling DNA of different species. Unlike the later versions like the Omnitrix and Ultimatrix, it is not connected to the Codon Stream nor Primus, limiting it to a single DNA sample. Eunice was also shown to be able to absorb DNA and powers of several animals (a rabbit, a bear, and a snake) and then to manifest traits of these animals (greater jumping ability, increased strength, and abnormal flexibility respectively) without changing form. The powers and abilities she absorbed from aliens and animals only last for ten minutes.

In addition, local wildlife seemed to be attracted to her to the point where normally shy animals would gather around her, and render more dangerous animals (like a bear or snake) docile towards her and others (this capability was likely included by Azmuth as a way for the Unitrix to easily obtain DNA samples from them likely to protect her and the item from danger since its only temporary and the Unitrix can only contain one DNA sample).

Trivia

 * Unlike the Omnitrix and Ultimatrix, she is not connected to Primus nor the Codon Stream, as the Unitrix stores DNA samples that are taken by the device.
 * As her mobile form is made of human DNA, it would technically make her as Azmuth's first human assistant, a possible replacement after Azmuth's former assistant Albedo went rogue and possibly for his need of new assistants.
 * Eunice is one of the few characters to be shown partially naked, similar to Kevin each time he reverts from a mutant to normal. Although in Eunice's case, she was actually fully naked whereas Kevin always had something on him bottom half.
 * Eunice bears a resemblance to Jennifer Nocturne, though being younger and more beautiful, with bright green eyes and not blue.
 * There is a possibility that because of the intent of the Unitrix more than one device of the same kind could possibly exist and their could be others in existence maybe other prototype models as well.
 * As the human DNA being sampled and stored she has in a way technically fullfilled Azmuth's original function for the Unitrix. So you can say Eunice is now a preserver for the human race. Despite the device being an prototype model of the Omnitrix even though the Codon Stream already has Human DNA being preserved in it.
 * It was confirmed by Dwayne McDuffie that whatever she absorbs, she only has the thing's powers for 10 or so minutes, much like the Omnitrix and Ultimatrix.
 * Dwayne said that we will see why Azmuth said that Eunice aka the Unitrix was so dangerous.
 * The reason the Unitrix landed on earth is because it was seeking a Omnitrix core like itself and the Ultimatrix technically has a Omnitrix core.
 * Despite the Unitrix having been created on Galvan Prime. Eunice as a person was born and created on earth.
 * Eunice is technically related to Ben and Gwen since she has Gwen's DNA. This was said by azmuth explaining that the Unitrix sampled then randomized Gwen's DNA into her own unique human DNA and created Eunice.
 * Eunice has Gwen's DNA but does not have Gwen's anodite powers or appearance as she is an artificial lifeform that became human and her body doesn't contain anodite life energy.
 * Eunice at the beginning, her origin was kind of similar to Supergirl's arrival on Earth. For instance, she appeared in a space pod, she had no clothes on, and she didn't know exactly what was happening.
 * Her blond hair could be the fact that Gwen's hair traits are Heterozygous Orange (Oo) leaving blond hair as the recessive gene.