Mana Manipulation and Energy ControlEdit
In the episode What Are Little Girls Made Of?, Gwen's magical powers and abilities are actually 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, the supernatural Force-like life energy that is present in all living beings throughout the universe. Verdona offered to take Gwen with her to Anodyne and teach her how to master all her powers and abilities (which would require about 75 years), but Gwen prefers to remain on Earth.
Her powers are mainly used like energy constructs, allowing her to make many different types of structures like, platforms, portals, shields, slides, beams, ropes, blasts, chains, cages, safety nets, barriers, bridges and energy bolts. She also possesses a variety of supernatural, magic-related powers and abilities such as telepathy, telekinesis, teleportation, dowsing, clairvoyance, levitation, spell-casting, mental detection, memory control-and-manipulation, energy manipulation, mana manipulation and, time travel (through spells).
In the two-part season two finale War of the Worlds when Kevin's life was threatened by a Highbreed commander, an enraged Gwen unleashes her dormant inner Anodite self for the first time and easily defeats the commander in mere seconds with an exceedingly strong and powerful blast of pure mana energy. Kevin begs her to try to shut it down but she refuses, saying that she thinks she can defeat the entire Highbreed fleet all by herself. Kevin reminds her that her paternal grandmother said that it would take at least seventy-five years for her to fully master all her powers and abilities though Gwen argues that they do not have seventy-five years. Kevin further argues by saying that she will lose her humanity entirely, that she will not remember either him or Ben and assures her that Ben will find another way to win and wants her to come back to him because he cannot bear to lose her. Gwen then reverts back to her human form and embraces Kevin. It's been comfirmed by Dwayne that if she was fully trained, she could easily stop the invasion, it is unknown if she could of without being fully trained.
In Hit 'Em Where They Live, when Zombozo threatens to make Ben suffer by endangering his mother Sandra, a furious Gwen unleashes her inner Anodite self for the second time and shows that she can grow to huge heights. It is unknown if Gwen can use this power and ability in her human form. Though this time she appears to have gained some control over the transformation as she does not appear to be overwhelmed by all of that power like the first time but it is through willpower she has been able to control it. This could mean that as years pass as Gwen learns to control her inner Anodite self she will gain more and more control over the transformation until she is able to control it entirely, meaning that she will be able to switch between both her human and Anodite forms at will. Gwen seems to only unleash her inner Anodite self when she is under a great deal of emotional anger.
In the episode Where the Magic Happens, Gwen claims that she feels much, much stronger and much more powerful in Ledger Domain, Charmcaster explains to her that all of the magic in the universe flows through Ledger Domain to all other worlds and planets such as Anodyne. It is clearly evident that she becomes exceedingly stronger and more powerful because when using her newly enhanced Anodite abilities she is able to produce much more mana than usual and can cause random outbursts of amazingly powerful mana explosions. For instance, one eye blast unleashed a wave of mana that destroyed whatever it hit, leaving only her allies unharmed. Her shields are also much stronger than usual capable of withstanding much greater force.
In the second season of Ben 10: Ultimate Alien, Gwen is shown to be a stronger Anodite than before. This is confirmed by Verdona, who says her powers are "developing nicely" considering her lack of formal training. In result to her well developed powers, Gwen has also gained the ability to do astral projections of herself (Source: "Ultimate Sacrifice"). Meanwhile in meditation, Gwen can allow her "inner-self" to project out of her body. As preformed before, she can use this ability to deep into the Ultimatrix. Her inner self takes the form of a full anodite.
Magic and SpellsEdit
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 all of Gwen's spells are said out loud to activate her magical powers and abilities, but in Ben 10: Alien Force, most of her spells are said 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 an Rube Goldberg-style chain reaction benefiting her original intent, but usually injuring Ben in the process (probably because this was part of her intent). She later brought back her superhero identity in the episode Tough Luck after obtaining the legendary lost Keystone of Bezel, which greatly increased and heightened 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. Five years later in Ben 10: Alien Force, despite fifteen-year-old Gwen's current preference for direct forms of mana-manipulation-and-control, she is still able to use magic in the more traditional sense. It was later revealed that what she and others all originally thought of as "magic", was actually her natural power and ability to control and manipulate a supernatural substance called life energy otherwise known as mana, chakra or chi, meaning that Gwen has always had an innate affinity for magic. Gwen mentions to both Charmcaster and Kevin in In Charm's Way that she still has Charmcaster's old spell book, and is looking through it constantly to find a cure for Kevin's mutation.
In the episode Time Heals, Gwen borrowed the spell book known as The Archamada Book of Spells (the only spell book mentioned, seen and used in the original series) in an attempt to use a time-traveling spell that will take her back to the time when Ben and Kevin tried to hack the Omnitrix, resulting in Kevin's present rock-like form, hoping to return him to his human form. However she returns home only to discover that her time-traveling resulted in both Hex and Charmcaster ruling the world. After finding and freeing Ben she recasts the time-traveling spell to return everything back to the way it was. Back in her room she puts The Archamada Book of Spells away on her shelf and is apparently not willing to use it for some time.
In the Ultimate Alien episode, Hit 'Em Where They Live, Gwen said to Charmcaster that she is much, much more proficient at magic than ever before, having have had more study, training and practice in the innumerable power levels,ways, and types of magic. In the episode Fused, Gwen uses an unusually strong and powerful nonverbal teleportation spell which envelops her, Kevin, and Ben (using AmpFibian) in a swirl of magical mystical pink-and-magenta energy to escape from Aggregor. However, the strength and energy required to cast this particular spell seems to exhaust her pretty quickly.
In Where the Magic Happens, Gwen claims that being self-taught in magic is not so easy as it looks. Trying to get into Yahwahtacsip she mistakes it's name for "Wah Di Tah", saying that she knows how to read it but not pronounce it correctly.
From Map of Infinity onwards Gwen begins to cast spells and recite spoken incantations again. Gwen is however less knowledgeable than Charmcaster and Hex, having been self taught. On the other hand, Gwen is much stronger and much more powerful than both Charmcaster and Hex. Hex could only use the Archamada Book of Spells with the help of the Charms of Bezel, while Gwen could use it on her own, proving that she is much stronger and much more powerful than Hex and Charmcaster combined.
She has also learned to astral project through magic. And she can summon her spell book to her.
Athletics and Martial ArtsEdit
Gwen is a capable gymnastic 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 were not too strong and powerful. When she was possessed by Ghostfreak, she was used to her martial arts skills combined which pretty much says that she is exceptionally good. At the age of fifteen it is revealed that she has already received a black belt in taekwondo and has even started teaching Ben.
When preferring to use her athletics during fights or when she cannot rely on her magical and Anodite powers like in In Charm's Way, she is shown to be quite nimble, agile, precise and quite skilled and experienced which is shown several times through the course of the series. Also during the Two-part episode War of the Worlds second part. It was seen when she fought the DNAliens hand to hand that she is phsically strong with after each blow they flew several meters and were knocked easy. It was also seen in It's Not Easy Being Gwen that she has a pretty strong physically when she broke through 8 straight boards.
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. In the episode Ben 10,000 Returns, Gwen is shown creating a whip of mana energy and using it as a plain weapon along with her fighting skills. When Kevin asks her how she learned it, she states remembering it from an old movie.
Knowledge and IntelligenceEdit
Gwen is shown to be very intelligent and knowledgeable. Before discovering her dormant innate magical and Anodite powers, she would often use her "brains" to help Ben. 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. She is straightforward and very brave despite the circumstances.
In the Back With A Vengeance, Gwen switched the Omnitrix with a bomb, saving both Ben and the world, showing her cleverness. Gwen is also highly intelligent enough to pronounce the spells accurately and correctly in an instant, with the spells being hard to pronounce as they are all from the Latin language. Gwen has a strong commitment to herself resulting her to manifest her knowledge, magical and physical abilities. She also shares traits with Ben, she would stand up for what is right and fight for it and may act a little naive (such as trusting Charmcaster in the original series, resulting her being tricked).