Rei Kurosaki is an esper, initially presented as a normal girl with latent psychic potential before Kenji Mitsuura recruits her for the Awakening Lab. She sports light orange hair and brown eyes, typically dressed in a pink track jacket and black sweatpants. Her primary ability is clairvoyance, manifesting as light blue psychic energy, enabling her to predict near-future events and identify optimal pathways, though her initial accuracy rate was approximately 62%.

Polite and good-natured, Rei becomes easily flustered around boys she finds attractive, like Ritsu Kageyama and Teruki Hanazawa. At the Awakening Lab, she enjoyed demonstrating her abilities. Her involvement there led to abduction by Claw's 7th Division, where she saw Kaito Shiratori apparently murdered, an event that deeply traumatized her. Learning Kaito survived restored her composure, allowing her to leverage her clairvoyance and guide Ritsu Kageyama and fellow kidnapped espers through the 7th Division's hideout to escape.

After these events, Rei continued refining her abilities under Teruki Hanazawa's guidance, significantly improving her accuracy. During Claw's world domination attempt, she navigated former 7th Division members and other espers through the organization's headquarters' sewer system until encountering Ryo Shimazaki of Claw's Ultimate 5. Later, she observed the city's destruction by ???% alongside other Awakening Lab members. Her final appearance shows her attending Arataka Reigen's birthday party.

Rei's clairvoyance evolved from predicting playing cards to navigating complex, unfamiliar environments. Her character development highlights increased resilience, transitioning from distress during captivity to determined leadership during escapes.