Langa Hasegawa grew up in Canada, learning snowboarding from his father Oliver starting at age two. After Oliver's death from unknown causes, Langa lost his passion for snowboarding. He moved to Okinawa, his mother Nanako's hometown, becoming emotionally detached, described as a shell of himself due to grief.

Physically, Langa has sky-blue hair often likened to snow, aqua-blue eyes, and a taller-than-average build. He typically wears a Japanese high school uniform—a black or white dress shirt with beige blazer and striped tie—always paired with light purple sneakers. His casual wear consists of baggy clothing like dark pants and blue coats, frequently chosen by his mother, such as the sleeveless shirt she selected for their Miyakojima trip.

Personality-wise, Langa presents a reserved, stoic demeanor, speaking minimally and displaying air-headed distractibility. Yet during skateboarding or snowboarding, he exhibits intense determination and near-reckless abandon, prioritizing thrill over safety. His Canadian background causes unfamiliarity with Japanese customs, struggling with seiza sitting or mistiming bows. After his father's death, he proactively sought part-time work to support household finances, demonstrating stubbornness and work ethic. He dislikes traditional Japanese toilets and performs Western Christian gestures before using restrooms.

Langa's snowboarding skills enabled rapid mastery of skateboarding after Reki Kyan introduced him to the sport. In his first "S" race against Shadow, he duct-taped his feet to the board to simulate snowboarding bindings, leveraging his existing abilities to win unexpectedly. His signature Backside Rodeo move provides aerial boosts during races. At "S," he earned the alias "Snow" for his hair color and snowboarding-inspired style, quickly gaining recognition as one of the strongest competitors.

Relationships are central to his growth. Reki Kyan became his first friend in Japan, teaching him skateboarding fundamentals and sharing the ethos that skateboarding should prioritize "fun." Langa grew deeply attached to Reki; their temporary separation caused him to lose enthusiasm for skating until reconciliation. When his mother asked if he "liked" Reki, Langa blushed and confirmed romantic feelings. He expressed confusion when she used female pronouns ("her?"), implying his attraction was specifically toward Reki. His bond with his mother Nanako is supportive; she offered advice during his conflict with Reki and assists with daily choices like clothing.

Langa's development features rediscovering joy through community. Initially drawn to skateboarding's adrenaline, he realized his passion depended on sharing experiences with others, especially Reki. Seeing "FUN" painted on his board during the final race against Adam pulled him from a detached "Zone" state, prompting him to prioritize camaraderie over victory. He concluded that happiness derives from meaningful connections over individual achievement.

Notable moments include fainting at the sight of blood during practice, consuming an entire platter of hamburgers while ignoring Adam's entrance, comically role-playing as Joe to "protect" Reki from Shadow at the beach, waiting hours in the rain during his fallout with Reki, and performing a flying hug-attack to reconcile after defeating Adam. These scenes highlight his blend of earnestness, obliviousness, and loyalty.

Langa's narrative also involves honoring his father's legacy. During the Adam race, he envisioned Oliver guiding him down the track, symbolizing his return to sports as tribute, not escapism. This completed his emotional healing, integrating past passion with present relationships.