Helen Wheels

Helen is a rogue Plumber kid that is part-Kineceleran and part-human, which suggests one of her parents were human and Kineceleran. She is the younger sister of Pierce. She and her partner, Manny, a Tetramand, capture many kinds of aliens that they believe that are not worthy to be on earth. They have also captured a DNAlien.

History
After capturing a DNAlien, their "alien scanner" points out three aliens which turn out to be Ben, Gwen, and Kevin. They believe them to be aliens so they set fire to a truck in hopes to see whether or not they are aliens. They then capture Kevin in hopes of leading Gwen and Ben to them. After a fight Helen realizes they are not the enemy and that they have been sending plumber kids into the Null Void, so Helen and Manny decide to enter the Null Void.

Her first appearance was in Plumbers' Helpers. She then reappears alongside Pierce and Manny in Voided working with Max Tennyson trying to stop DeVoid, who turns out to be Ben's old enemy Dr. Animo. Then along with the help of Ben and Max they defeat him. She then reappears in "War of the Worlds" alongside Pierce, Manny and Grandpa Max to help Ben defeat the Highbreed threat, once the threat is over she becomes a pupil of Max. In Season 3, she makes another appearance in Above and Beyond where Ben is supposedly attacking Grandpa Max, But it is actually a test for them.

Abilities
Being of an part-Kineceleran heritage, Helen has come into the superhuman speed of a Kineceleran, (at about a half of the speed and power.) Helen had appearently spent most of her earlier life in human for and had been oblivious to her true heritage until some time prior to the events of Plumbers' Helpers. After finding herself with Manny Armstrong, (a human/Tetramand hybrid,) and her adoptive brother, Pierce, Helen started hunting down DNAliens.

While Helen now predominantly resembles a Kineceleran, her human roots do shine through; while full-blooded Kineceleran stand and move like a small bipedal dinosaur, Helen stands more upright like a human. When not moving at superspeed, Helen moves like a roller skater.

Helen has also learned how to use her speed to her own and her team's advantage beyond the obvious; during the climax of Above and Beyond, in conjunction with Alan Albright, Helen helped to restrict Ben-as-Humongousaur's movements and range of vision by using the airflow produced by her superspeed to fan Alan's flames.

Trivia

 * She is Pierce's adopted sister (as revealed by Dwayne McDuffie) though it is unknown how they met or what happened to their parents.