Alan Albright Friends

Ben is the boy who found the Omnitrix, a device used to transform into different alien beings.

Cooper is one of Ben's allies and is the grandson of one of Max's plumber friends.

Gwendolyn Tennyson is the better half of Ben 10's team. She is the brains, and he is the brawn. As Gwen has gotten older and matured more, she has become romantically attracted to ex-con Kevin Levin whom is now her boyfriend, she is considered a extremely powerful spellcaster.

One of the plumbers' kids with Human/alien descent

Kevin is Ben's enemy in Ben 10, absorbing the Omnitrix' powers. However he returns as Ben's ally in Alien Force.

Max is Ben and Gwen's grandfather. He is a member of the plumbers; a group of people who protect the earth from alien threats.

one of the plumber kids ally to Ben now he is dead.