*Helen (ヘレン, Heren?) is a character that appears in the Sonic X anime series and its comic series published by Archie Comics. She is one of Christopher Thorndyke's closest friends, and one of the few humans who readily accepts Sonic the Hedgehog and his residential friends from the beginning. Helen was born with a condition that restricts her to a wheelchair and has spent much of her life as a paraplegic.

Helen is a young human girl with peach skin, wavy blonde hair with bangs, and aqua eyes. As a teenager, Helen wears a long-sleeved orange dress alongside a brown belt with a golden buckle, a white pearl necklace, and dark blue heels. She also has her hair tied into a high ponytail by an orange hair tie, and sometimes wears a white lab coat while in her lab working with Danny, Frances, Chuck, and Chris before he went to Sonic's world.

Six years after Sonic and his friends, along with Eggman and everything else from Sonic's world, returned to their world, Helen had taken up work alongside Chris to get the portal to Sonic's world working again to go visit him. In that time, she had gotten a car specially designed for her from Chuck Thorndyke due to her paraplegic condition. One day, while Chris was working on the portal, the two of them drove over to meet up with Danny and Frances to reminisce about their adventures with Sonic and his friends.

As a teenager, Helen's personality is a little more outgoing. She acts more sarcastic and is a bit more excitable when speaking with Chris.

Over time, Helen has acquired scientific knowledge that could compete with Chris' skills. Helen started working in a large computer company, where she was involved in programming and machine building.

Because of her paralyzed legs, Helen has limited physical skills, which forces her to ride in a wheelchair.*