Gwendolyn Catherine "Gwen" Tennyson is a Human/Anodite hybrid Plumber, the paternal cousin of Ben Tennyson, and (along with Kevin Levin) was a front line member of his team during the first 3 shows. Gwen was first introduced when her parents sent her on a summer-long road trip with her Grandpa Max and her cousin Ben. She has, as Verdona refers to it, "The Spark".
In Ben 10: Omniverse, like her boyfriend Kevin, sixteen-year old Gwen is a recurring character rather than a main one, as she went off to an Ivy League college, but visits occasionally.
n the original series, Gwen had short orange hair held by a blue hair clip and green eyes and wore a blue shirt with a cat logo on her chest and white capris. She wears a blue hairclip in her bangs. Her lucky girl outfit is worn in Lucky Girl and Tough Luck.
In the first and second seasons of Alien Force, Gwen wore a white shirt under a dark blue sweater, black stockings under a black mini skirt, and black high heels. Her hair has also grown longer and is now down to her waist. 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 her Anodite form, she looks like a mini version of Verdona. At the beach, Gwen wore a black bikini. Later on, she wore a white one. In Ultimate Alien, Gwen's outfit is similar to her outfit from the first two seasons of Alien Force, but with a red sweater while her hair still is now slicked back in a ponytail.
In Inspector 13, Gwen is seen wearing a violet tank with a white skirt and tennis shoes.
In Omniverse, Gwen still has her ponytail, but it's much shorter. She now wears clothes similar to her Alien Force seasons 1-2 outfit, except she now wear long white socks that go up to her knees with black mary janes. She now also has freckles.
Later on, she has shorter hair, which is now orange again, with her blue hairclip, a light blue T-shirt with her cat logo on it, a blue plaid miniskirt and wears blue-tinted glasses. In her new Anodite form, her skin turns purple, but her hair remains the same length, but is now made of mana and is pink and her eyes also turn pink. Her glasses also become a blue mask and she now wears blue gloves and her shirt is a darker blue with a light blue stripe. Her shirt cuts off and reveals her midriff and naval. She also wears blue boots, a dark blue miniskirt with a light blue stripe and a belt. The cat logo on her shirt also becomes black with pink eyes.
11 year old Gwen in Omniverse looks just like she did in the original series except that she has freckles and her cat logo is now bigger.
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.
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 goodwill, 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 love for her cousin, Ben, became more clear in the future series 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.
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. However she is mainly nice to Ben in contrast to the original show where she was portrayed as sarcastic.
Powers and Abilities
Mana Manipulation and Energy Control
Gwen's magical powers are revealed to be of alien descent inherited from her grandmother Verdona, a member of a free-spirited alien race of pure energy beings known as Anodites, from the planet Anodyne. Verdona tells Gwen that, like herself, Gwen is also an Anodite; she has "the spark" and thus is able to freely manipulate and control mana.
Gwen can create energy blasts, shields and barriers. Her powers are mainly used like energy constructs, allowing her to make many different types of structures like, hammers, protective helmets, battering rams, beams to grab and throw enemies, stepping stones/platforms to carry her and others though air, safety nets; it also turns out Gwen can also synchronize her martial arts styles with her energy manipulation abilities.
Gwen has more mana-related powers: She can find any person she wants by detecting the traces of mana that he/she left. She can also absorb mana.
She also has the abilities of telekinesis, teleportation, heat vision, telepathy and healing living beings. She can also transform into an Anodite. In her Anodite form her powers are greatly enhanced, having demonstrated the abilities of flight and size alteration.
Magic and Spells
Gwen is seen using magic through casting magical, mystical spells, and reciting spoken incantations thus enabling her to use various magical powers and abilities.
In the original series and Omniverse flashbacks, all of Gwen's spells are said out loud, but, in Alien Force, most of her spells are used non-verbally.
On two occasions, Gwen used the five mystical Charms of Bezel to become a super heroine by the name of Lucky Girl. At first her power and ability drew from the luck-granting Charm of Bezel, which innately gave her complete and perfect luck in everything she did. While wearing the charm, any action she took would result in a chain reaction benefiting her original intent, but usually injuring Ben in the process. She later brought back her superhero identity in the episode Tough Luck after obtaining the legendary lost Keystone of Bezel, which greatly increased her natural abilities to superhuman levels rather than just affecting her luck. Both times, Gwen was forced to retire when the five Charms and Keystone of Bezel were destroyed.
Gwen claims that being self-taught in magic is not so easy as it looks. Trying to get into Yahwahtacsip she mistakes its name for "Wah Di Tah", saying that she knows how to read it but not pronounce it correctly.
Later Gwen begins to cast spells and recite spoken incantations again. Gwen is less knowledgeable than Charmcaster and Hex, having been self-taught, but she is also more powerful than Charmcaster until Charmcaster obtained the Alpha Rune, after which she was powerful enough to defeat Gwen with ease.
She has also learned to astral project through magic.
Athletics and Martial Arts
Gwen is a capable gymnast and martial artist. Even in the original series, she was occasionally shown to be quite good in hand-to-hand combat fights against enemies who had normal strength levels. She was part of her school's Jujutsu team. At the age of fifteen it is revealed that she has already received a black belt in Taekwondo.
When preferring to use her athletics during fights or when she cannot rely on her magical and Anodite powers, she is shown to be highly skilled in hand-to-hand combat.
According to Dwayne McDuffie on one of his forums, Gwen does martial arts, horseback riding, softball, skiing and cross country. Turns out that Gwen can also synchronize her martial arts styles with her mana manipulating abilities. Gwen is shown creating a whip of mana energy and using it as a weapon along with her fighting skills. When Kevin asks her how she learned it, she states remembering it from an old movie.
Knowledge and Intelligence
Gwen is shown to be very intelligent and knowledgeable. Before discovering her dormant Anodite powers, she would often use her superior intellect to help Ben solve problems. She 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.
In Back with a Vengeance, Gwen switched the Omnitrix with a bomb, saving both Ben and the world, showing her cleverness.