Ben 10

Ben 10 is an American media franchise created by "Man of Action" (a group consisting of Duncan Rouleau, Joe Casey, Joe Kelly, and Steven T. Seagle) and produced by Cartoon Network Studios.

The franchise is about a boy who acquires a watch-like alien device called theOmnitrix that allows him to turn into alien creatures.

characters:

Benjamin "Ben" Kirby Tennyson, is the main protagonist of the series. He is a 10-years old (fifteen in Alien Force, sixteen in Ultimate Alien and Omniverse) child from Bellwood, who found the Omnitrix during his summer vacation with his grandfather Max and his cousin Gwen. 

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Gwendolyn Catherine "Gwen" Tennyson is Ben's ten-year old cousin (fifteen in Ben 10:Alien Force, and sixteen in Ben 10: Ultimate Alienand Ben 10: Omniverse).

In the original series, Gwen shares a love-hate family relationship with Ben. Before discovering her dormant magical and Anodite powers, she would help Ben by simply using her innate cleverness and intelligence. She is known to be a capable gymnast and martial artist and has received a black belt in taekwondo. Gwen is a very good student, especially in the episode "It's Not Easy Being Gwen", which shows that Gwen takes her education very seriously and in Ben 10: Omniverse, she is shown leaving for college.

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Kevin Ethan "Kev" Levin is an eleven-year old (sixteen in Ben 10: Alien Force, seventeen in Ben 10: Ultimate Alien-present) Human/Osmosian hybrid with the unique ability to absorb any type of matter or energy in order to utilize it in various ways.

Kevin was one of the antagonists during the original show due to absorbing various energies, an action that warps an Osmosian's mind. After accidentally absorbing energy, Kevin demolished his family's house, thinking that his stepfather, Harvey Hackett, had convinced his mother to throw him out. Running away from home, he eventually ended up in New York City and made a home for himself in the subway tunnels. 

Rook Blonko is a Revonnahgander from the farm planet Revonnah. He is a former Plumber, assigned to Ben by Max after Gwen and Kevin left.

He is a top Plumber Academy graduate, being a highly skilled fighter. He possesses many Plumbers' weapons and technology, such as the "Proto-Tech Armor" and "Proto-tool", a shape-shifting weapon that turns into a sword, bow, grappling hook, blaster, etc.

Rook is an extremely skilled fighter with advanced knowledge and training. But he is a By-The-Book cop with no actual experience, always treating Ben as a superior rather than a friend or a partner. He has limited Earth cultural knowledge and an inability to understand sarcasm, in contrast with Ben's wise-cracking, taught by experience personality. As a result, Ben was initially reluctant to accept the collaboration, even feeling it was forced by Max, but starts warming up to him eventually. Rook, on his side, is well-aware of Ben's status as a hero and admires him for it. He does not use contractions.

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Maxwell "Max" Tennyson is the sixty-year old (sixty-five in Ben 10: Alien Force, sixty-six in Ben 10: Ultimate Alien and in Ben 10: Omniverse) paternal grandfather of Ben and Gwen. Despite his age, Max has shown on multiple occasions to be highly athletic and a formidable fighter. He takes his grandson gaining superpowers and super-abilities in stride and supports Ben in any way he can. Max was once in the United States Army, had been in an astronaut program, and was a Plumber and has been through his share of scrapes; Ben and Gwen didn't know of this at first, believing him to have been a literal plumber.