As a Fusion, she must take the form of her host, Gwen Tennyson. The only differance is her Fusion Matter Skin, Dark Green Hair, Red Eyes, Dark Blue-Green Shirt, and no ponytail.
Fusion Gwen was created by Fuse to assiant Fusion Ben in the space port; she also has another fusion location. Given her assignment, Fusion Gwen locates Ben Tennyson and studies the Omnitrix/Ultimatrix Progress Rate and at the right time, she steals a alien DNA sample when Ben transforms into a transformation. However, on her way to deverie the samples, Gwen drops the samples and the Hero's mission is to recive and return the samples before Fusion Gwen returns to retrive them. She then blocks the entrancce to Fusion Ben's Lab to convince the Hero that she had the last sample, the Swampfire Root. After the Hero defeats her, they then retrive the sample as it was formed into a Swampfire Nano.
- Unlike Gwen, She seems to lack Mana making sense on how she traveled to Fusion Ben's Hideout instead of traveiling there using Magic
- A similarity to Gwen and Fusion Gwen is that they are both sensetive and friendly on how Fusion Gwen took to blame to for the samples and caught the Hero off guard on Fusion Ben's projects
- Unlike Gwen and Kevin, She doesn't seem to show any intrease or contact with Fusion Kevin, probally since Fusion Kevin is a Fusion of eleven year old Kevin instead of 17 or 18 year old Kevin