* Eli Samuels: Eli is 18 years old, 6′9″ (201 centimeters) tall. Hes an A student, and is the salutatorian in high school. His mother has Huntingtons disease, which he could have too.
* Jonathan Samuels: Jonathan Samuels is Elis father, who loved his wife. He has a problem with Eli working at Wyatt Transgenics, because of things that went down in the past. He is initially completely unwilling to tell Eli anything about his mother's relationships with Dr. Wyatt.
* Dr. Quincy Wyatt: Dr. Quincy Wyatt is a famed geneticist, who is considered to be on par with Mendel, Watson, and Crick. He offers Eli a job. He displays an unexplained interest in Eli.
* Vivian Fadiman: Vivian Fadiman is Elis girlfriend and Valedictorian at his high school. All she wants is to be part of his life and she supports him in everything he does. Its hard for her to understand why Eli hides major parts of his life from her. Eli is devoted to her, though they do go through some rough times.
* Kayla Matheson: A year older than Eli, he gets to know her via Dr. Wyatt. He is attracted to her because of her beauty and athleticism.
* Ava Samuels: Ava Samuels was Elis mother and lived in a nursing home because of her Huntingtons disease. She had a mysterious connection with Dr. Wyatt.