Ben Tennyson was a normal ten-year-old kid until he found the Omnitrix, a powerful watch-like device that allows him to turn into ten different aliens. Though immature and clumsy, he uses the Omnitrix to stop evil, but that doesn't stop him from using it for his own personal needs.
Ben wears a black and green shirt with the number 10 on the top left corner, dark green cargo shorts, blue boxer shorts, black low profile sneakers, and white socks. His eyes are green, and his hair is brown. He wears the Omnitrix around his left wrist.
During water-based activities, he wears a green swimsuit.
In The Sound and the Furry, he wore a white hooded jacket with green stripes on both arms.
In Dreamtime, he wore green pajamas.
Ben is childish and cocky, and likes to have fun. He doesn't like to do lots of cleaning. His reckless behavior sometimes leads to consequences, such as Ben awakening the Hydromanders when splashing on Niagara Falls as Cannonbolt. Besides his childish behavior, Ben is heroic and caring, willing to help and save anyone in need.
Ben is not into as many fandoms as Gwen, and usually teases her and geek culture. Despite his brattish and indifferent demeanor, Ben by far is anything but ignorant; having guessed straight away just what exactly child star Michael Morningstar truly is by just a few glances.
Ben is afraid of squids, more specifically, tentacles. He has grown the courage to use them as Gax, but the fear is still there when he's a human.
Ben can be bored very easily, and is not good with math.
The Omnitrix: A powerful device that allows Ben to transform into 10 different aliens with a variety of different skills and powers.
Whenever the Omnitrix times out, Ben is left powerless unless he switches into a new alien form. In addition to gaining the selected alien's powers, he gains its weaknesses. The Omnitrix also mistransforms at times, sometimes choosing an alien not fit for the situation.
Benjamin is a name from the Hebrew name בִּנְיָמִין (Binyamin) which means "son of the south" or "son of the right hand" going back into the Tanakh (called the Hebrew Bible by Christian scholars), a name of one of the sons of Jacob. His name, "Ben," is to create a rhyming effect between his first name and the number Ten. Also, his surname is a reference to 'Ten' of Ben 10.
- Ben is 7 seconds younger than Gwen.
- Old Ben being voiced by Yuri Lowenthal in The 11th Alien: Part 1 is a reference to how teen Ben was voiced by Yuri in the original continuity.