Ben 10 Fan Fiction Wiki
Ben 10 Fan Fiction Wiki

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Gwendolyn Tennyson
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General Information
Species Human
Home World Earth
Residence Bellwood
Age 10
Affiliations Team Tennyson
Occupations Student
Heroine (part-time)
Powers and Abilities
Abilities Enhanced Intelligence
Enhanced Gymnastics
Equipment Laptop
Relatives Frank Tennyson (father)
Natalie Tennyson (mother)
Carl Tennyson (uncle)
Sandra Tennyson (aunt-in-law)
Ken Tennyson (older brother)
Ben Tennyson (cousin)
Max Tennyson (grandfather)
Verdona (grandmother)
Ben (great-great-grandfather)
Jedediah Tennyson(great-grand-uncle)
Nicknames Freak/Doofus/Big Butt/Dweeb (Ben)
Gwenny (Natalie)
Cuz (Ben)
Pumpkin (Max)
Voice Actor Ashley Johnson
First Appearance The Rising Hero

Gwendolyn "Gwen" Tennyson is the sister of Ken and paternal cousin of Ben. She is an human from the planet Earth in Ben 10: Tales of the Omnitrix. She first appears in The Rising Hero. She is founding member of Team Tennyson.


Gwen is a girl with short red hair, green eyes, and fair skin. She has blue shirt with a cat logo on her chest, khaki capris. She has blue and white converse-like shoes. She also wears a blue hairclip to pin her hair to the left side of her face.


Gwen is a remarkably smart and quick-witted girl who is the mastermind behind nearly all of her cousin's plans of defeating villains. She plays an active role as the brains of Team Tennyson. She is also wise beyond her years and often gives Ben advice.

Although she and Ben have many disagreements, Gwen often finds a way to get along with him. She is respectful and friendly towards people in general, but she is not afraid to make sarcastic comments towards whom she is arguing or disagreeing with.

Gwen can be a bit tomboy-ish because of how she acts and speaks sometimes. Even though she is usually confident about herself, she still has insecurities about not being useful to Team Tennyson.



Ben 10: Tales of the Omnitrix

Powers and Abilities

Gwen is quite skilled in gymnastics.

Gwen is shown to be a bit of computer and tech wiz as well. She has her own laptop which she uses to research enemies she meets.


Since Gwen is a mere human, she is susceptible with most human weaknesses and is at a major risk when going against a powerful opponent.


All Episodes.


  • Gwen's favorite flowers are yellow roses.
  • Gwen does not yet know her major.
  • Gwen hates mushrooms.
  • Gwen had her own plans for a summer vacation. It was Max who convinced her mother to push her to go on the road trip.
  • Gwen has 4.2 GPA, she is the president of the Computer Club, treasure of the Science Society, volunteer at several local charities, and a member of her school's Jujutsu team.