Kaoru Sakurayashiki rigorously separates his professional life from his underground skateboarding alias, Cherry Blossom. He sports long sakura-pink hair, golden eyes, and a pale complexion. Outside "S," he dresses traditionally in a navy-blue kimono, gray and yellow obi, white tabi socks, zori sandals, and silver-framed glasses, often carrying a fan. A purple wristband connects him to his AI assistant, Carla. As Cherry Blossom, he ties his hair in a high ponytail and wears a sleeveless white hakamashita kimono with purple accents, hakama pants, a black armband bearing a cherry blossom emblem, bandaged wrist-guards extending into gloves, a black balaclava mask, and reinforced zori sandals. His high school appearance featured shorter hair covering his right eye, multiple ear piercings, and a lip ring. He owns Sakurayashiki Calligraphy, specializing in AI-assisted calligraphy. His shop boasts traditional Eastern decor with maroon walls and plum flooring, displaying awards for Artificial Intelligence Calligraphy. He declines job applications from minors and occasionally works off-site, holding client meetings at Kojiro Nanjo's restaurant or conducting public demonstrations. His calligraphy expertise informs his analytical skateboarding style. Publicly, Kaoru presents as a calm intellectual, treating clients politely. Privately, he exhibits a prickly demeanor, especially toward childhood friend Kojiro Nanjo (Joe), with whom he frequently argues. He becomes intensely competitive during "S" races, utilizing Carla to optimize performance and record data to surpass rivals like Adam. Despite his aloof exterior, he genuinely cares for friends, advising Reki Kyan and Langa Hasegawa on skateboarding and collaborating with Kojiro to support them. He reacts violently to breaches of his identity separation, assaulting Joe for using his real name at "S" and slapping Reki for calling him "Cherry" publicly, stemming from a desire to protect his reputation. His skateboarding is enhanced by Carla, an AI-integrated board he developed. Carla calculates optimal angles for jumps and turns, records performance metrics, responds to vocal commands, and transforms into a longboard mode ("Type: Long") for speed. His logical, data-driven approach contrasts with other skaters' instincts. He leverages extensive knowledge of skateboarding and adjacent sports, quickly identifying Langa's snowboarding background and replicating Adam's "Love Hug" to demonstrate counters. As a founding member of "S," he ranks among its top competitors, using Carla’s precision for complex stunts. Kaoru shares a longstanding friendship with Kojiro since kindergarten. As teenagers, they skated with Ainosuke Shindo (Adam), forming the original "S" trio. Kaoru challenged Adam to a "beef" (race), forging a close bond. Adam's subsequent violent behavior and abrupt departure for America caused Kaoru lasting betrayal, fueling his desire to defeat Adam at "S." Childhood clinginess and fear of solitude contributed to Carla's creation; she now manages his sleep schedule with lullabies. Kaoru shares a complex dynamic with Kojiro, blending rivalry with deep mutual trust, often discussing "S" matters at Kojiro's restaurant. He mentors Reki and Langa, recognizing their potential. His history with Adam involves unresolved conflict from their fractured friendship and Adam’s destructive actions. Personal preferences include disliking childcare, favoring carbonara and Italian cuisine, and fantasizing about a space honeymoon. He would meticulously plan romantic gestures using Carla’s research capabilities.