Gwen looks the same as she did during Ultimate Alien because designs never changed when Omniverse happened. She wears her pink shirt along with a black skirt, stockings, and high heels, and her hair is tied. She may also wear her other Alien Force/ Ultimate Alien outfits.
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While on a summer vacation road trip with her grandfather and cousin, Gwen slowly learned how to use magic. She helped Ben fight villains. 5 years later, it is revealed that Gwen knows mana and it is revealed but she is of Anodite heritage. She made arch enemies of her own along the way, including Charmcaster and Hex. She developed a relationship with Kevin.
Ben 10 & The Master Assassins
Gwen does not play a key role in BTMA, she's a supporting character who helps Ben. She tries to convince Ben that the deaths are not his fault. In Mana of The Target, Gwen is targetted, however, she is one of the few targets that survives. She was devastated when Ben switches sides in Crisis Begins.
Crisis: Broken Days
Gwen becomes one of the leading characters in Broken Days. While Kevin believes Ben has completely turned evil, Gwen believes he can revert back.