Raichi Kuronashi, a central blonde-haired teenager with striking red eyes, initially sports a beanie, black hoodie featuring pink and blue accents, shorts, and sneakers. After a two-year timeskip, he wears a white t-shirt and updates his beanie with a white band replacing the purple. His final battle ensemble includes a white striped sweatshirt over a purple-and-white shirt, purple pants, fingerless gloves, and a purple beanie with orange stripes—a deliberate homage to another character's attire.

Calm and strategic, Raichi acts as the analytical counterbalance to his impulsive childhood friend Harubaru Hinode. Their shared history remains unexplored in the anime, yet he maintains unwavering loyalty and respect within their competitive dynamic. As a Darkus-attribute brawler, he partners with Destroy Munikis, which evolves into Zero Munikis, then Hollow Munikis, and finally Zeta Munikis after the longest evolution gap in the series. His signature technique is the "BakuTech Zero Gravity Spin."

Raichi co-founds Team Dragaon alongside Harubaru, Koh Grif, and Sho Grif. His tactical prowess yields a high win rate, though Harubaru defeats him in their first encounter. Key victories include battles against Zakuro; Sho and Koh Grif (tag-teaming with Harubaru); and his own doppelgänger. He also contributes to group fights against antagonists like the Shadow Sanjushi. A narrative divergence occurs in the Tavanel Cup arc: the manga depicts him leaving without farewells to Harubaru, while the anime shows him aiding Harubaru in testing the Jigen Dragaon. His final battle against Harubaru features his specialized white-and-purple outfit.

Notable plot details involve the Jigen Ring's creation; the manga reveals he crafts it using the key to their childhood apartment—a detail omitted in the anime. The anime also excludes their shared background. In a web-exclusive epilogue, Raichi joins Harubaru and Tatsuma to confront a mind-controlled Zakuro, helping free him through collective resolve.