A twelve-year-old with extraordinary intelligence, Luke becomes a leader among his peers at the Institute, using strategy and kindness to influence those around him.

A ten-year-old telepathically gifted boy, Avery is smaller than his age but significant in power within the Institute's hierarchy.

The unyielding Administrator of the Institute, Mrs. Sigsby is dedicated to its mission, overseeing the operations and maintaining control.

Maureen works at the Institute driven by personal circumstances and reveals complexity in her interactions with the children over time.

Annie is a homeless woman who shows belief in and advocacy for those she cares about, recognized for her distinct attire and conspiratorial mindset.

As Security Chief and ally to Mrs. Sigsby, he underestimates the children at the Institute, viewing them through a controlling lens.

Kalisha acts as a nurturing figure for her peers, especially for Avery, providing comfort and connection amongst the children.

Nicky is a resilient and spirited member of the friend group at the Institute, noted for his determination and his close bond with Kalisha.

George is known for his humor and ability to lift the spirits of the children around him at the Institute.

Two kind children in Luke's group, known for their supportive and friendly nature, with Iris being the first lost to Back Half.