Ben: Ben is the wielder of the Omnitrix (Prototype) (later the Ultimatrix and then the Omnitrix), which gave him the power to modify his own genetic code in order to turn into various alien creatures, literally making him an alien shape-shifter. Traditionally, he could only transform into 10 aliens at the beginning of both the original series and Alien Force, but he later gains additional forms by either unlocking them or by scanning the DNA of aliens he meets. At the end of the original series, his arsenal included twenty aliens, while his current complete list is sixty-three aliens discovered. When transforming into an alien, Ben gets all the creature's features, including its appearance, voice, all of its unique and special abilities and powers, strengths and weaknesses. In addition to transforming into aliens, the Ultimatrix includes what is referred as an "evolutionary function," that allows Ben to evolve his aliens forms in order to get upgraded version of themselves, referred to as Ultimate Forms.
Gwen: Mana Manipulation and Energy Control, Magic and Spells.
Kevin: Kevin has the ability to absorb the energy and matter of anything (excluding certain materials). Energy Absorption, Matter Absorption.
Ben 10: Alien Force
Plumbers, Fighting Vilgax, the Forever Knights, and Protecting the Earth from Aliens.
Ben 10 Alien Force-Ben 10 Omniverse
Will Fight the Team Avatar (The Last Airbender).
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Ben's team is the team Ben forms after his grandfather, Max Tennyson disappears. Without his grandfather's guidance, he assembles a team under his grandfather's last orders to him. This team assists Ben in his duties to defend Bellwood from hostile alien activity in extension the Earth and other places.
The team eventually disbanded when Gwen had gone to college and Kevin went to live in the same town as her.