In the original series, Gwen had short hair and green eyes. As she has grown older, her red hair has grown longer and her eyes seem to have darkened.
In the series Ben 10, Gwen wore a blue shirt with a cat logo on her chest. Her lucky girl outfit is worn in Tough Luck and Lucky Girl.
In the first and second seasons of Alien Force, Gwen wears a white shirt under a dark blue sweater, black stockings under a black mini skirt, and black high heels. In the third season, she wears a red shirt paired with a black vest, gray pants, and black flats. Her hair is worn in a high ponytail.
In Ultimate Alien, Gwen's outfit is similar to her outfit from the first two seasons of Alien Force, but with a red shirt while her hair still is now slicked back in a ponytail.
In Omniworlds she wears the same clothes.
Her naive nature is toned down in Alien Force; she is now even more analytical. It is highly unlikely that she will get stupefied; she is also a quick thinker and an instinctive person. But at times she trusts others too quickly, and that may disadvantage her or even injure her, like in Too Hot To Handle. She can handle things well despite the conditions (such as when her magical powers were drained and Charmcaster hit her with a bolt of magical energy and she immediately reversed the spell though she had no magical, mystic power left yet she could hold herself). Gwen is at times shown to be very concerned with things such as her surroundings, the people around her and the ones who she cares about. She is very strong (physically and mentally) and well mannered, despite her inflating sarcasm and ego at certain times. Gwen is a very caring, compassionate person such as shown from her acceptance of Kevin's past and recent action, also saying she does not care about Kevin's appearance.
In episode It's Not Easy Being Gwen, it shows that Gwen takes her education very seriously. Showing to come home late at all hours of the morning and having to wake up at 5:30 am in the morning. When waking up so early she does a number of things before going to school. Such as jogging, practice French, school, and afterschool karate classes. It's also presumed that Gwen goes to private school since it shown that her usual clothing are actually a uniform at her school.
First 28 Episodes expect for Time Error.
Gwen is the only Anodite shown to use magic.
|Ben 10 Characters|
|Ben Tennyson | Tack|
|Gwen Tennyson | Kevin Levin | Max Tennyson | Chris | Julie Yamamoto | Manny Armstrong | Helen Wheels | Alan Abright | Jimmy Jones | Azmuth | Paradox | Cooper Daniels | Ship | Eunice | Sir George| Costin|
|Tetrax Shard | Colonel Rozum | Sugilite | Albedo|
|Hope | Argit | Hex | Simian | Baz-EL|