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, green cargo shorts, blue boxer shorts, black low profile sneakers, and white socks. His eyes are green, and his hair is brown.
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.
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 until it re-charges. 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.
His name, "Ben," is to create a rhyming effect between his first name and the number Ten.
- Ben is 7 seconds younger than Gwen
- Ben Tennyson (Original Version)