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

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

Rex: He is aggressive and reckless, Rex prefers to smash anything that gets in his way, much to Providence's annoyance. However, he eventually begins to show more discretion and consideration. Rex has also shown a selfless side to his personality and he is also a friend to Ben