Gwen (voice of Megan Fahlenbock) is The Goth Girl.
Gwen joined TDI because the money would make life a lot easier for her mother. By choice, she is the loner of her school. She fears being buried alive. She had a crush on Trent, but in "Search And Do Not Destroy", she sees him kissing Heather causing Gwen to dislike Trent.
The original character designs show Gwen as a redhead, wearing a brown t-shirt and blue jeans.

French Name: Joëlle.