Flashy Flash is a 25-year-old male human, born March 11th, standing 172 cm (5'7½") tall and weighing 65 kg (143 lbs.). He possesses feminine features, sharp blue eyes, and shoulder-length silver hair adorned with two eight-pointed star-shaped hairpins. His attire consists of a dark blue bodysuit with metallic bracers and upper chest armor, complemented by a distinctive white cape secured by a black star-shaped pin. A chain around his waist anchors his sword sheath. Originating from the brutal Ninja Village, he endured 72-hour training cycles with only 6 hours for sleep, focused solely on lethal techniques. As part of the 44th Graduation Class, "The End," he trained alongside Speed-o'-Sound Sonic. During childhood, they collaborated to eliminate a monster, and Sonic later proposed overthrowing the village's corrupt leadership. Flashy Flash acted alone, slaughtering the entire village—instructors and students—except for Sonic, ending the 44th generation. His failure to eliminate the prior generation led to the Heavenly Ninja Party. He escaped the village and enrolled in the Hero Association. Ranked 13th among S-Class heroes, Flashy Flash specializes in weapons-based combat. His Hero Association ratings are Power (10), Speed (10), Intelligence (6), Popularity (8), and Fighting Ability (9). He suggested his own hero name and focuses on eliminating high-level threats. During association meetings, he maintains a calm, serious demeanor, intervening in conflicts like those between Tatsumaki and Metal Bat. He exhibits arrogance and confidence, dismissing lower-ranked heroes as liabilities and openly challenging Tatsumaki over stolen kills and disputed superiority. He firmly believes rigorous training is the sole path to true strength, a philosophy stated to foes Gale Wind and Hellfire Flame as they perished. He rarely respects peers but acknowledges Shadow Ring's ninja skills, possibly due to shared background. He harbors particular animosity toward Sweet Mask, criticizing his arrogance despite displaying similar traits. He initially underestimated Saitama, attacking him twice for evasion, but later begrudgingly acknowledged his skill. His combat abilities are defined by extreme speed and reflexes: moving at near-light speeds creates shockwaves and afterimages. He executed the Hundred-Eyes Octopus’s eye slashes instantaneously and killed monsters faster than A-Class ninja Shadow Ring could perceive. He effortlessly matched human-form Demon-level monsters Gale Wind and Hellfire Flame, facing pressure only after their Dragon-level transformations; their three-way combat generated explosions appearing in slow motion. He later held his own against Platinum Sperm and Garou, contributing to light-trail formations during high-speed aerial combat. His strength and durability include stunning Dragon-level opponents with kicks, destroying caverns through collateral damage, withstanding simultaneous assaults from two Dragon-level monsters with only minor injuries, enduring prolonged exposure to Cosmic Fear Garou’s radiation beyond most S-Class heroes’ tolerance, and surviving attacks from Platinum Sperm and Garou. He masters ninjutsu with unparalleled precision. Ultimate techniques are **Flash Slash** (decapitating foes before reaction), **Flash Fist** (high-speed punches), and **Flash Kicks** (rapid stunning kicks). Other maneuvers are **Flowing Shadow Feet** (afterimage-assisted strikes), **Spinning Top Slide** (evasive spin), and **Wind Blade Kick** (momentum-driven flip kick). He possesses unrevealed forbidden techniques deemed too lethal. Webcomic-exclusive abilities include hurricane creation via sword-spinning (**Sky Ripping Scattered Flash Slash**). Enhanced senses allow him to estimate Saitama's weight (70 kg) through footsteps and fight effectively in darkness. His primary weapon was the katana *Instakill*, used to defeat Dragon-level threats until destroyed in a cave-in. He acquired a replacement sword, later broken by Saitama during sparring. Saitama subsequently gifted him one of two Legendary Demon Swords stolen from the Ninja Village Leader. He also wields a kunai as a secondary weapon. His waterproof cape repels liquids like monster blood. Key feats include being the first S-Class hero confirmed to solo a Dragon-level threat (Hundred-Eyes Octopus), simultaneously killing Dragon-level monsters Gale Wind and Hellfire Flame via *Flash Slash* while statued in slowed time, fighting Platinum Sperm and Garou in a triple battle creating visible light trails across the sky, sparring with Saitama while evading initial contact using techniques like *Spinning Top Slide* and *Flowing Shadow Feet*, and clearing criminal organizations and bounty hunters during downtime. Weaknesses include his cape compromising stealth and risking hindered movement. Powers vary between media: webcomic iterations include hurricane creation, absent in manga/anime. He was buried under rubble during Tatsumaki’s battle with Orochi-Psykos due to a lost communicator, immobilizing him despite his speed. He often underestimates opponents, delaying decisive actions against foes like Hundred-Eyes Octopus or Gale/Hellfire. He suggested his own hero name. Creator ONE initially avoided confirming his relationship to Sonic, though illustrator Yusuke Murata later clarified their shared Ninja Village background. He is the only S-Class hero to dodge at least one attack from Garou.