A smart and once-popular 15-year-old who became blind, forming a deep connection with Bobby, sharing a unique bond over their feelings of invisibility.

Bobby’s mother, a literature professor at the University of Chicago, who reevaluates her relationship with Bobby after a significant revelation.

Bobby’s father, a physicist at FermiLab, who approaches Bobby’s condition with scientific curiosity and works with others to find a solution.

Alicia’s father, an astronomy professor, who collaborates with David to solve the mystery of Bobby’s invisibility.

Alicia’s mother, an English Literature degree holder, who learns to grow and adapt to Bobby's unusual situation.