Eunice

The Unitrix (Uni- means one, in contrast of Omni meaning all) also known as Eunice is a prototype of the Omnitrix created by Azmuth which can absorb, contain and recall the DNA of different species.

Eunice was first introduced in "The Transmogrification of Eunice", when Azmuth lost her, and he hired Sunder to find her. When Ben, Gwen and Kevin met her, Ben got a crush on Eunice, and so as 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, created when he wanted to preserve alien DNA. Following a brief argument, Ben allowed Azmuth, under a compromise, to take on Eunice as one of his assistants on Galvan Prime, Azmuth also states that when Gwen cut her hand trying to open the pod containing the Unitrix, her human DNA was sampled and then randomised it (which explains why she has blond hair) creating Eunice's human form.

In her true form, she is a cylinder core, similar to the Omnitrix and Ultimatrix, however, the core resembles a container instead of a watch, but does feature a control dial that, when pressed down, turns it to its mobile DNA form (in this case, Eunice). As a prototype Omnitrix, the Unitrix is capable of storing DNA of different species, unlike the Omnitrix and Ultimatrix, she is not connected to the Codon Stream or Primus, limiting it to a single DNA sample. Eunice was also shown to be able to absorb DNA and powers of several animals and then to manifest traits of these animals without changing form, the powers and abilities she absorbs from aliens and animals last for about ten minutes. There is also a green rectangle on the back of her neck and when Sunder pressed it, it turned her back to the Unitrix.

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, possibly to protect her and the item from danger since it's only temporary and the Unitrix can only contain one DNA sample. She also received an upgrade to have a one way link subspace link to Primus for uploading DNA samples. However, having the link active can cause parallel signal interference which could cause the Ultimatrix to lose its connection to Primus until it's shut off.

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