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Ben 10
Gwendolyn "Gwen" Tennyson is Ben's cousin. She's voiced by Meagan Smith, and future Gwen is played by Tara Strong. Although Ben does not like her and has nicknamed her "freak", she still helps Ben whenever he needs help. She has a huge interest in magic and she doesn't even know how big relation she has with magic. She first knew about it when she used Hex's staff in the episode Tough Luck even when Hex said that only a master magician like him is able to use his staff. She even stole Charmcaster's spell book in oreder to learn more magic.
Ben 10 Alien Force
Gwen at the age of 15 in ben 10 Alien Force,
In the sequel to the series Ben 10 alien force Gwen's hair has grown darker and much longer than in the original series. Her lips are more full and visible then when she was 10 and she has earned black belt and is undefeated in her school. In addition to her physical change she now wears a blue shirt and black skirt with tights and apparenly grown out of her tomboy stage. She is now more calm and mature and doesn't pick on Ben as much. Recently, the new Ben10 alien force episode reveals that Gwen doesn`t use magic, but instead her grandmother, Verdona is an alien, and so is she.
Relationships
Kevin Levin is a former enemy turned ally at the start of the Alien Force series. The death of Magister convinced him to join Gwen and Ben to finish the alien conspiracy case they were working on in search of their Grandfather. Gwen and Kevin have a mutual crush on each other and care deeply for one anothers safety. As seen in the episode Kevins Big Score when Kevin changes back from his monster-like form the two share a tender embrace. Also in the episode All The Glitters Kevin becomes jealous when Gwen goes on a date with Mike Morningstar, a new villan that steals girls' energy, although Gwen went out with Mike beecause Kevin wouldn't ask her out.