Rei Kurokawa manages and MCs at the fashion brand shop Prism Stone. He was once one of the era's three prominent male Prism Stars, competing fiercely against rivals Hijiri Himuro and Jin Norizuki for the Prism King crown. Rei withdrew from the tournament after Hijiri suffered a severe injury, believing Hijiri was his only worthy rival; this led to Jin becoming Prism King by default.

Specializing in charismatic street-style Prism Shows, Rei maintains ties to underground circuits. He holds a strong conviction to protect the vulnerable, demonstrated when he intervened to stop Alexander Yamato from being bullied. This act inspired Alexander to adopt Rei's street-style and strive to become the most charismatic street-style Prism Star.

Rei's influence extends to others; Kazuki Nishina sees him as a major inspiration, drawn to Rei's embodiment of freedom and independence. Rei later provided Kazuki with direct training. His personal philosophy champions authenticity, evident in his unwavering commitment to street-style performances despite facing disregard from judges.

Physically, Rei possesses long gray hair and green eyes, standing 173 cm tall. His birthday is August 8. His musical contributions include the song "EZ DO DANCE." Beyond performance, Rei also engaged in technical work, creating an android to facilitate interactions for another character.