Ruu, a half-elf of the Light Wing Race—renowned as the universe’s most powerful beings—wields superhuman strength and flight enabled by functional wings. Her yellow-blonde hair and brown eyes contrast her dual demeanor: she balances approachable cheerfulness in casual moments with ruthless combat prowess during conflicts. Driven by galactic wanderlust, she joins a martial arts tournament promising interstellar travel as the grand prize. Though uninvited, she disrupts the finals by effortlessly defeating opponents like Hammer Man and K.K., hurling them from the arena with devastating kicks. She spurns hollow victories, demanding genuine triumph through combat even when organizers prematurely name her champion—a testament to her fierce pride and unwavering principles.

While journeying post-tournament, she fiercely protects imperiled allies, confronting traitors and obliterating malfunctioning temple guardians to shield villagers. Though forming an alliance with a galactic prince and the grudgingly tolerated K.K., her rapport with the latter remains strained, marred by clashing temperaments and mutual suspicion.

Sparse familial ties surface through letters to her parents detailing cosmic adventures. Her attire echoes 1980s anime aesthetics, featuring a sleek swimsuit-like design. Her narrative arc concludes within the original OVA, with no expansions or continuations documented in subsequent media.