Gwen Tennyson

Gwendolyn "Gwen" Tennyson is the female protagonist in the Ben 10 franchise. She is the paternal cousin of the franchise's titular protagonist Ben Tennyson and a main member of his team.

She was voiced by Meagan Smith in the original series, Ashley Johnson in the following sequels, and Montserrat Hernandez in the reboot.

Appearance
In the original series, Gwen had short red hair held by a blue hair clip and green eyes and wore a purple one-piece swimsuit with a light blue diagonal stripe across her midriff in A Small Problem and a teal green one in Divided We Stand.

In Alien Force, her hair had grown longer and was down to her waist when let loose. In What Are Little Girls Made Of?, she wore a white bikini, though in In Charm's Way, she wore a black bikini.

In the reboot, Gwen is a girl with short red hair, green eyes, and fair skin. She wears a spaghetti strap one-piece swimsuit colored sky blue, with heart-shaped bumps where the straps meet (crossing over her breasts as well). She also wears a sky blue hairclip to pin her hair to the left side of her face.

Personality
In the original series, Gwen is portrayed as an intelligent, mature but usually stubborn and smart-mouthed when it came to talking with Ben. Her quick thinking and good instincts give her an edge in dealing with dangerous situations. However, she's sometimes too trusting with people who want to exploit her good will, leading her (or others) into harm's way.

As she got older, she became even more mature, as well as becoming more caring and sympathetic. Her affection towards her cousin Ben became more clear as well.

Gwen is willing to forgive villains for their wrongdoings, the most notable being Kevin, if she believes they've changed for the better. Although her intelligence and knowledge have only increased since the original series, she's not completely free of her naivete, and can be arrogant at times as well.

Despite being far more mature and reasonable than Ben and Kevin, Gwen is somewhat hotheaded and can lose control of her mana if angered enough.

Gwen occasionally prioritizes things incorrectly, seen when she put more importance on Ben arriving to Julie's tennis match on time than stopping the Forever Knights' armed robbery of a museum.

In the reboot, 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.

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 is quite forgiving, considering she was more worried than angry at Ben for running away.

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.

Gwen has an adoration towards science, things from the 80s and 90s eras, space, and geek culture.