Kiera's younger sister, known for her outspoken nature and loyalty, who supports Kiera by keeping her secret and defending her against external challenges. She plays a critical role in assisting her sister throughout the story.

Kiera's game moderator and online friend, based in Paris, who works alongside Kiera to maintain and develop SLAY. Claire provides crucial support and companionship for Kiera in both personal and game development endeavors.

Kiera's boyfriend, whose initially affectionate demeanor masks more rigid and controlling ideologies. His character unfolds significant challenges and tensions in Kiera's life.

Kiera's affluent and well-meaning in-person best friend, who sometimes struggles with understanding issues related to race. She represents themes of privilege and the personal growth required to overcome it.

Harper's younger brother who exhibits entitled and immature behavior, often misunderstanding issues around race. His presence in the story adds to the nuance around privilege and the development of discriminatory views.