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, white socks, and black low profile sneakers. His eyes are green, and his hair is brown. He wears the Omnitrix around his left wrist.
Ben is childish and cocky, and likes to have fun. He doesn't like to do cleaning. His reckless behavior often lands him in trouble. Besides his childish behavior, Ben is heroic and caring, willing to help and save anyone in need.
Ben is not into nerd culture as much as Gwen, and usually teases her and geek culture. Despite his bratty and indifferent demeanor, Ben is, by far, anything but ignorant.
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.
After Kevin Levin started bullying him, he apparently developed a fear of public restrooms and prevented him from eating lunch for around 3 months.
Ben can get bored very easily, and is not good at math and science.
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.