Ben: He is a blend of youthful naivety, mischievousness, and heroic growth teenager. Initially, he's a playful, sometimes selfish teen who uses his Omnitrix powers for fun and sometimes to fight evil. However, as he matures, he develops into a responsible hero who is willing to put others before himself and he is the cousin to Gwen

Kevin: He is a rebellious and somewhat sociopathic teenager, with a tendency towards anger and impulsive behaviour. He later develops a more positive outlook and becomes a loyal and caring member of Ben's team, though his lawless, delinquent side occasionally resurfaces and he is the boyfriend to ben's cousin "Gwen". and he also has loves his car

Gwen: She is is a smart, sarcastic, and witty teenager who is often the voice of reason and strategy to Ben's impulsive actions. She is also a powerful magical user with a strong bond with Ben, serving as his confidante and partner in their adventures and she is the cousin to Ben and the girlfriend to Kevin*

Albedo: He is arrogant, self-centered, ambitious, and bitter. He is also uncapable to accept Ben's right to being the wielder of the Omnitrix, thinking that he is just an unworthy human. and he looks like Ben but he has red eyes and white hair and he often struggles to get back into his true form

Mad Ben: He is is extremely bloodthirsty, megalomaniacal, sadistic, spiteful and power-mad towards his subjects in his dimension; he reacts with extreme aggression and threats whenever anyone else at all so much as talks to him and he is alternative timeline of Ben

Nega Ben: He is evil, [DJW 2] possesses an "emo" personality, and is very negative and gloomy. He finds everything to be "lame", although he is by no means inactive, and can still be very vicious and dangerous and he is an alternative timeline of Ben but emo and evil

Bad Ben: He is sadistic enjoyment of being evil. He actively seeks out ways to inflict pain and suffering on others, often using his Omnitrix abilities in cruel and destructive ways. He is a contrast to the hero-oriented Ben Tennyson and enjoys playing mind games and withholding and he is a alternative timeline of Ben but evil and with black hair