Chisei Kuzuryū, known as Yasha, is a founding member of the hip-hop unit Buraikan. He has ochre hair with blonde streaks and purple eyes, standing 178 cm tall with a slender, muscular build. His appearance features multiple tattoos on his left cheek, neck, right arm, left shoulder, and left leg. He typically wears a black tank top, a gold-and-purple-accented jacket off-shoulder, baggy black pants with similar accents, one purple sock with black-gold stripes, and white-black-gold sneakers. His accessories include various chains, belts, and a Phantometal necklace. Before music, he was a professional basketball player from age 19 to 22. At 24, he co-founded Buraikan with Haruomi Shingu. The unit acquired Phantometals at 27, popularizing Phantom Live. His Phantometal is a gold chain necklace with an eastern dragon pendant, activated by kissing it to summon a gold eastern dragon phantom surrounded by lightning. Approximately ten years ago, during a performance, he collapsed due to Phantometal corrosion and died despite Haruomi's "metal kiss" mind-dive attempt. His physical death is confirmed, with his age listed as "28". The Chisei appearing in present interactions is a corporeal phantom illusion manifested and sustained by Haruomi, inspired by Kanata Yatonokami's ability. This phantom operates independently, capable of physical interaction and speech. Personality-wise, he maintains a strict schedule: sleeping 4 AM–10 AM, songwriting 3 PM–7 PM, and nighttime activities like basketball or gym workouts. He uses "ore" for himself and calls Haruomi "Shura" or "partner". He nicknames Hajun "48" (Yonpachi). His hobbies include motorcycle driving; his favorite foods are hamburgers and Haruomi's ramen, though he dislikes bony foods like fish. Character hashtags include #Overwhelming Genius and #ShuraIsTheTreasureIFound. The phantom manifestation reappeared publicly a decade after Buraikan's disappearance, notably during Paradox Live, attributed to interactions with cozmez enabling Haruomi's projection. Haruomi's aged appearance contrasts with Chisei's unchanged look. Visual cues like lacking reflections in early music videos and phantom-specific effects in performances align with his non-living nature.