Beast King

Towering and heavily muscled, Beast King takes the form of a humanoid lion complete with a thick mane and a swishing tail. His five-fingered hands end in sharp claws, and his padded feet each carry four toes. Over a black shirt he drapes animal pelts across his shoulders and wraps a leopard-print cloth at his waist, cinched by heavy chains and a belt whose buckle is shaped like a lion's head. Bands ring his wrists and ankles while bracers guard his upper arms, all of which he smashes off once his fury takes over.

Beast King is a creature of noise, forever roaring and bellowing his way through a fight. He carries himself with towering arrogance, boasting of his standing as the House of Evolution's second-mightiest fighter, and grows steadily more rattled as Saitama's baffling strength and calm refuse to give him the fear he expects. His comrades mean nothing to him, and he waves off cutting down Slugerous and Frog Man as simple jungle law. The anime paints him with a streak of patience, content to let Saitama brush the dirt from his clothes before they clash.

After Saitama instantly wipes out Mosquito Girl, Dr. Genus grows curious about the human specimen and dispatches Beast King with Armored Gorilla, Kamakyuri, Ground Dragon, Frog Man, and Slugerous to drag him back for study. Saitama shreds the ambush and, though Ground Dragon pins him into the concrete, frees himself the moment Beast King taunts him with threats to gouge out his eyes. The insult sends the lion into a wild slashing rampage that accidentally kills Slugerous and Frog Man, and even after bulking up his strength he is gutted by a barrage of the bald hero's punches. His death scatters Ground Dragon in flight and shatters Armored Gorilla's nerve, driving him to plead for his life. Later, a flock of birds descends on his remains and mutates from feeding on his entrails.

As a Demon-level threat, Beast King wielded staggering power, capable of splitting entire buildings with his claws or with nothing more than the shockwaves those slashes threw off, and his speed let him rip out multiple cuts in a blink. Rage triggered a transformation that swelled his muscles until his clothing tore away and stripped him of all restraint, even overriding Dr. Genus's commands. His claw work took shape as Lion Slash, a flying strike that sliced through stone and flesh at range, and its escalation, Lion Slash: Meteor Shower, buried opponents under a storm of blows. His entire duel with Saitama lasted only fifty-eight seconds.