Ben tennyson

Benjamin Kirby Tennyson, more commonly known as Ben or Ben 10, is the main character in all three of the Ben 10 series: Ben 10, Ben 10: Alien Force, and Ben 10: Ultimate Alien.

He is first introduced in the episode And Then There Were 10, where he finds the Omnitrix and then, throughout the series, learns to use the powerful alien device, including the responsibility of wielding it, to become a true hero.

It should be noted that Ben is three-quarters human and one-quarter Anodite (though Anodites have no DNA).

Original series
Ben was originally a typical ten year old boy, who grew up in Bellwood, who was unpopular and bullied in his school.

However, his life changed the day he went on summer vacation with his grandfather, Max and his cousin, Gwen. A short time after they left Bellwood, Ben went on a walk through the woods in which they were camping, and witnessed the crash of a strange capsule from space. This capsule happened to contain the Omnitrix, a powerful watch-like device, who fixed itself on Ben's wrist.At first scared, Ben soon discovered that using the Omnitrix, he was now able to transform into ten super-powered alien creatures. Unable to remove the Omnitrix, he eventually learned to use the device(though with relative problems) in order to become a super-hero. Though he occasionnally arrested ordinary criminals, he was quickly led to also fight super-villains, starting with Dr. Animo, Kevin 11, and ultimately Vilgax, a vicious alien warlord who wanted to get the Omnitrix for himself. Ben in Alien ForceDespite being very immature and occasionnally using the Omnitrix for minor selfish purposes, Ben proved to be a valuable wearer for the Omnitrix, defeating Vilgax several times(though mostly due to the help from Gwen and Max) and saving people several times.

During this series, Ben's favorite alien is Fourarms, showing his tendency to favor brute force over well-thought plans.

Kai Green
Kai Green is a girl of Navajo descent and the granddaughter of Wes Green, a former Plumber and a long time friend of Grandpa Max. She appears in the episode Benwolf where Ben catches a glimpse of her dancing and is immediately smitten. At the end of the episode, Ben attempts to establish a relationship with her but is immediately rebuffed when he learns that she had just admired him in his alien form. In the alternate future she is Ben's wife and has two children with him; a boy named Ken and a girl named Gwen.

[edit] Julie Yamamoto
Julie Yamamoto is an Asian-American Japanese student and the teenage tennis player who its Ben's current love interest. She first appears in the pilot episode of Alien Force as a crowd attendant to Ben's soccer match. At the end of the two-part season two finale War of the Worlds, Ben and Julie get close to kissing, but decide against it as Gwen, Kevin, and Max were all looking on. In the series premiere of Ben 10: Ultimate Alien, Ben and Julie share their first kiss; although technically, Julie kissed him on the cheek. It said that Ben and Julie will be kissing often throughout the series as their affection for each other grows.

[edit] Elena Validus
Elena Validus is one of the Plumbers' kids and a former member of Ben's soccer team. She is mentioned by Gwen as Ben's first crush (though this contradicts what was seen in the original series as Ben met Elena when he was thirteen while he met Kai when he was ten). Ben had to convince his soccer team mates to let her join. She appeared in the live-action film, Ben 10: Alien Swarm.

[edit] Jennifer Nocturne
Jennifer Nocturne is a famous film actress who appeared in the episode of Ultimate Alien, Hero Time, when she had an instant crush on Ben when he saved her life. Later she tried to make up a relationship with Ben just for publicity sake and make a better career for herself (Eventually leading to Ben's first on-screen kiss with her). Later on, she was captured with Julie by Captain Nemisis who had become the supervillain Overlord. When Overlord had the two of them hanging from a statue, he gave Ben the option to only to only save one of them before blasting the cord holding them. Without a hesitation, Ben turned into Goop and saved Julie while Kevin and Gwen saved Jennifer. After Ben defeated Overlord, Jennifer, impressed with Kevin's heroics in her rescue, tried to make a move on him, but was threatened to back off by Gwen.