Flashy Flash is a human male hero affiliated with the Hero Association, initially ranked S-Class 13 and later confirmed as S-Class 10. He possesses feminine features, sharp blue eyes, and long ice-blonde hair secured by two matching star-shaped hairpins. His attire consists of a dark blue bodysuit with metallic bracers, upper chest armor, a white cape adorned with eight-pointed stars, and a chain around his waist holding his sword sheath. He stands 172 cm tall and weighs 65 kg. His background traces to the Ninja Village, where he graduated from the 44th class, "The End," sharing a connection with Speed-o'-Sound Sonic. This intensive training shaped his belief that rigorous practice is the primary path to true strength, a philosophy he explicitly articulated to adversaries like Gale Wind and Hellfire Flame. He maintains a calm, serious demeanor but displays arrogance toward lower-ranked heroes, whom he perceives as weak and prone to causing collateral damage. He is unafraid to confront formidable figures like Tatsumaki, openly challenging her after insults or claims she stole his victories. Flashy Flash's primary abilities revolve around extraordinary speed and reflexes, enabling attacks within centiseconds. He demonstrated this by swiftly dispatching monsters invisible to allies like Shadow Ring and simultaneously combating two Dragon-level threats, Gale Wind and Hellfire Flame, in their monster forms. His combat prowess includes delivering powerful kicks that stun such foes, cleaving massive stone structures, and generating explosive force sufficient to devastate battlefields. He exhibits notable durability, enduring direct hits from multiple Dragon-level monsters with only minor injuries. In ancillary media, Flashy Flash appears in OVAs such as "The Murder Case That Is Too Impossible," where he attends a hot spring resort with other S-Class heroes. When questioned about his absence during the Dark Matter Thieves invasion, he states he was occupied fighting other monsters. During the murder investigation involving Zombieman, he expresses skepticism toward Metal Bat's alibi. In "Zombieman Murder Case 2," he vacations in a mountain lodge but encounters S-Class colleagues and Saitama's group. After Speed-o'-Sound Sonic attacks and events destroy part of the lodge, Flashy Flash remains detached, relaxing upstairs while others investigate. He also appears briefly in manga extras like "Owned Items," interrupting lower-ranked heroes' discussions to refocus them on missions. His hero name was self-proposed. He holds the distinction of being the first S-Class hero confirmed to single-handedly defeat a Dragon-level threat. Post-Monster Association arc, his rank increased to S-Class 10, reflecting his elevated status.