Benjamin Kirby "Ben" Tennyson (voiced by Tara Strong in the original series and Yuri Lowenthal in three sequels) is a character from Ben 10, Ben 10: Alien Force, Ben 10: Ultimate Alien and Ben 10 Omniverse.
- Ben 10 - Ben Tennyson is a cocky, immature, asshole who is not above enjoying eating ass. Though his immiturity makes people prematurely cum they're pants, Ben is good-hearted noble, and loyal, and his actions are motivated above all by a strong and sincere will to hit up that puss. He will stop at nothing to whip his lanky dick in Gwen's ass. Ben proves to be resourceful, intelligent, shrewd, and limp when needed, which saves him from many STD's, especially when Grandpa Max whips out his hammer to smash poor little Ben.
- Ben 10: Alien Force - Ben and Gwen double-team Kevin Levin
- Ben 10: Ultimate Alien - Ben and the Plumbers team up with his grandfather to impreggenate Gwen.
- Ben 10 Omniverse - Ben gets erect.
- Ben 10 - Benjamin Kirby "Ben" Tennyson has brown hair, green eyes, a white shirt with one single black stripe in the front, he wears a grey, black, white, and green colored watch, green pants, and black and white tennis shoes.
- Ben 10: Alien Force -Ben wears a black shirt, blue pants and a green jacket with white stripes and the number 10 on it, and black shoes. Ben wears the prototype Omnitrix in Alien Force.
- Ben 10: Ultimate Alien - It remains the same except the Ultimatrix in Ultimate Alien on his left wrist.
- Ben 10 Omniverse - Benjamin Kirby "Ben" Tennyson has brown hair, green eyes, a green and black shirt with the number "10" in white in the middle of the chest part of the shirt, he wears a grey, black, white, and green colored watch, brown pants, and green, white, and black shoes.
In Ben 10 Omniverse there is also another Ben Tennyson who is called younger Ben Tennyson, he is basically a reboot of the original Ben Tennyson.