|Relatives|| Ben Tennyson (cousin)|
Max Tennyson (grandfather)
|Voice Actor||Montserrat Hernandez|
Gwen is a red-headed girl with green eyes and wears a white shirt under a blue shirt with a cat face on it. She wears brown cargo shorts and wears blue and white striped socks. She has blue and white shoes.
Fights with Ben a lot, and is a bit tomboyish. When she is not fighting against him, she tries to help him. Sometimes she helps him and fights with him at the same time.