Ben Tennyson is the titular protagonist of the Cartoon Network series of the same name, and the love interest of Lori Powers. He has brown hair and green eyes. In the original version, as an 11-year-old, his outfit is composed of: a white short sleeved shirt, green pants and black and white shoes. In the Alien Force series, his outfit is composed of: a green long sleeved jacket under a black shirt, blue jeans and black and white shoes. In Omniverse, his main outfit is composed of: a black long sleeved shirt, blue jeans and white shoes. He is previously voiced by Tara Strong in the 2006-2008 cartoon, and is currently voiced by Yuri Lowenthal (the man behind Scott Lawton from Accidentally Adventures) as of Alien Force. At his age, he is 16-years-old.
- Sandra and Carl Tennyson (Parents)
- Verdon and Max Tennyson (Grandparents)
- Natalie and Manny Tennyson (Aunt and Uncle)
- Gwen Tennyson (Cousin)
- Lori Powers (Love Interest)
- Being perfect to Lori Powers
- Going hero
- Using his omnitrix.
- Being called off
- Ruining his attitudes
- Breaking his omnitrix