Helen Wheels is a Human/Kineceleran hybrid and a former Plumber's kid. She was originally an Amalgam Kid created by the Rooters but went on to become a Plumber. She is a close friend of Simon Masterson, as well as his main love interest.
She looks like a regular Kineceleran with light blue skin, three fingers instead of claws, and white eyes. She wears a standard Plumber suit.
Young Helen looked similar to her teenager appearance but she had a bigger head and eyes and lacked elbow spikes.
Helen's human form was only seen for a short time. She had flipped-up, spiky light blue hair and wore the Amalgam Kids' outfit. She also had light blue eyes.
Helen is smart, brave, kind, nifty, and level-headed, though at times she usually tries to act rational and wise, making her mostly a mirror image of Gwen Tennyson, as well as an older sister figure for younger Plumbers such as Cooper and Alan. She is shown to be devoted to Max, willing to help him when he was seemingly attacked by Ben.
Helen shares a love-hate relationship with Manny. While Manny is usually hot-headed, aggressive and enjoys using violent methods, Helen is usually more careful and less aggressive, causing occasional arguments. On the other hand, she stated that they worked better teaming together than with other Plumbers, and shows true concern when seeing him injured or in danger.
Helen was actually born as a human who was taken to the Null Void by Servantis. He used Kevin's powers and a Kineceleran to create Helen's current form. She, along with Manny, Alan and Pierce formed a group, named Amalgam Kids and they were used by Servantis to do "nasty things". After they failed in their ultimate mission, their memories were completely wiped by Servantis.
Years later, Helen became part of a team of young Plumbers apprentices, the Plumbers' Helpers, which included her, Pierce and Manny. However, they had little knowledge of the technology they used, and Pierce was sucked by a Null Void Projector they had confused with a disintegrator weapon. Believing that Pierce was dead, Helen and Manny continued the work, capturing many kinds of aliens they confused for criminals and sending them into the Null Void.