Hellfire Flame

Black hair juts upward in spikes whose tips curl back down, framing an angular, sharp-featured face marked by heavy brows and a dark patch over the left eye. Tall and solidly built, he dresses in a sleeveless black top and trousers layered under a white vest with a spiked collar and a flame motif, finished with dark arm warmers and guards over the forearm and throat.

Shifting into his monster shape sharpens his teeth into fangs, floods his skin with throbbing veins, tips his hands with claws, and wraps his whole body in living fire. After being cut apart, resurrected, and jolted back to life, pale horizontal scars remain etched across his chest and arms.

Composed and level-headed by nature, Flame generally follows the lead of his partner Gale Wind. He nurses a deep resentment toward Flashy Flash, whom he blames for the graduation massacre known as The End. As he lay dying, he confessed the bitterness that drove the two of them to embrace monsterhood: raised as assassins who existed only in darkness and treated as instruments rather than people, they wanted just once to stand among the rulers and plunderers, and he wept as he spoke.

He holds open contempt for the Heavenly Ninja Party, branding them mindless robots who surrender every decision to their master. Losing to Flash stung, yet the hero's remark that he simply lacked training pushed him to train harder with Wind for a rematch. He later mocked the Ninja Party as fools for imagining sheer numbers could ever bring Flash down.

Trained in the same village as Speed-o'-Sound Sonic and finishing atop the celebrated Golden class with Gale Wind, Flame is an elite speedster whose reflexes and pace rival Sonic's own. He and Wind fight as a seamless duo, covering one another and overwhelming targets with barrages too quick to follow. His signature element is fire: his touch runs scorching enough to ignite objects, and he can wreathe his fists or his katana in flame, the blade even spitting small fireballs. Among his named techniques are the burning kick Flame Blade Kick, a rapid multi-slash of fire, a body-replacement trick using a wooden decoy, and a move named for the joro spider.

Classified as a Demon-level threat in human form and an S-Class criminal, Flame becomes far deadlier as a monster, climbing to Dragon level and briefly forcing a holding-back Flashy Flash to take him seriously. Having swallowed a monster cell, he can slip into that form and back at will and gained a lengthened lifespan, though he insists only those in full control of their bodies keep their human shape. In monster form his strength cracks concrete effortlessly and shrugged off Brave Giant's Gigavolt Smash.

He first surfaces ambushing Sonic in a forest, introducing himself and Wind as senior ninjas and pitching the Monster Association's plan to seize power and kill Flash. The pair later corner Flash inside the association's base, and once outmatched they unleash their Dragon-level monster shapes, pressuring the hero severely before he grows serious and cuts them both in half. Phoenix Man reanimates their corpses to fight Brave Giant, but Child Emperor's electric counter shocks them loose. They wake fully alive afterward, only for Saitama to knock them out, and Child Emperor delivers the S-Class criminals to the Hero Association. Later, during the Neo Heroes era, the two resurface, tangle again with Flash and Sonic, and are eventually subdued and left bound in their own razor wire alongside the Heavenly Ninja Party.