Reki Kyan is a cheerful and energetic high school sophomore whose world revolves around skateboarding. He sports spiky red hair, amber eyes, and a lithe build, typically accessorized with an Egyptian blue headband featuring white detailing, a red wrist sweatband, and skater street fashion, often highlighted by a yellow hoodie. His facial expressions are highly expressive. Naturally sociable, Reki connects easily with others who share his passion, frequently using casual physical contact with friends. He works part-time at Dope Sketch skate shop, where he designs, customizes, and repairs skateboards. His mechanical aptitude and keen observation allow him to tailor boards to individual skaters, like crafting a specialized board with a swiveling front truck and foot-clip modifications for Langa Hasegawa to accommodate snowboarding skills. Reki also analyzes terrain and opponent styles to strategize races. His passion began when a childhood friend taught him skateboarding; despite lacking innate talent and learning tricks slowly, Reki developed a deep love for it. He continued skating even after this friend suffered a serious accident. Reki later discovered and participated in "S," an underground skateboarding race in an abandoned mine. He introduced Langa to both skateboarding and "S," forming a close bond while teaching him the fundamentals. Reki's self-doubt escalates as Langa's natural talent allows him to rapidly excel and surpass Reki's experience. Public perception labeling Reki as merely Langa's "lackey" or "the redhead sidekick" intensifies his feelings of inferiority. After a traumatic, humiliating loss to Adam in a race, Reki spirals into depression and anger. He isolates himself, avoids friends—especially Langa—quits "S" by surrendering his entry pin, and abandons skateboarding entirely. During this period, he validates self-harm, accepting physical attacks as deserved. Reconciliation sparks when Reki observes Langa racing and instinctively cheers for him, revealing his enduring concern. He gradually acknowledges his desire to skate alongside friends rather than watch from the sidelines. A pivotal moment comes when Reki crafts a new board for Langa, painting "FUN" on its underside to symbolize skateboarding's core purpose. This act aids Langa in a critical race and catalyzes Reki's emotional recovery. He repairs his friendship with Langa, explicitly committing to "skate infinitely together." Post-reconciliation, Reki demonstrates renewed confidence in skating and board-making. He strategically employs rain wheels and environmental awareness during a rematch against Adam, competes without self-deprecation, and openly expresses joy regardless of outcomes. His self-perception shifts: he accepts compliments more readily, takes pride in his mechanical skills, and no longer measures his worth against others' talents. The series concludes with Reki preparing for a one-on-one race against Langa, insisting on no concessions. His philosophy solidifies around finding happiness through shared passion over competition, summarized in his declaration: "I know what my happiness is!"