Royal Ripper

Royal Ripper (キリサキング, Kirisakingu; Viz: King the Ripper) was a member of the Monster Association and an infamous monster.

Appearance
Royal Ripper is a humanoid monster wrapped almost completely in bandages, having exposed only his right eye and his long dark disheveled hair. Over his wrappings, he wears a worn out tattered black dress and flat black shoes. Instead of hands, he has a pair of long and sharp straight blades that he sometimes uses to scratch the floor in a menacing manner.

Personality
Royal Ripper is a sadistic monster with a very strong drive towards torture and killing. He is shown to get excited over cutting apart anything, enemies as well as allies. He experiences intense sadism towards children and Black Sperm was not surprised when Royal Ripper disappeared with Busaiku, remarking that "He couldn't hold back his urges." Phoenix Man describes him as an "a one-of-a-kind psycho who kills for pleasure," so much so that even other monsters avoid going anywhere near him.

He is very psychotic, yet childish, refering to his fellow monsters with honorifics in a rather playful manner. Although he enjoys toying with his opponents, he can easily be overwhelmed by his killing instincts as shown when he attacked a distracted Garou from behind and continued to viciously slash at him despite the latter already being down.

Royal Ripper is considered sadic and violent even among monsters. He even states to Tareo that he doesn't care for the Monster Association, as his only goal in life is to slaughter other creatures.

Monster Association Arc
He attempted to murder Narinki's Private Squad before Do-S stopped him. He and Bug God are sent by Gyoro Gyoro to follow Garou and investigate his actions.

Royal Ripper confronts the Hero Hunter when he questioned whether he was truly a monster. As proof of Garou being a monster, Royal Ripper demanded Garou to murder Tareo. However, Royal Ripper's urges for killing children soon take over, ultimately resulting in Royal Ripper and Bug God fighting Garou.

Despite Royal Ripper and Bug God's best efforts, Garou managed to fend them off. However, Sludge Jellyfish took Tareo hostage, distracting Garou and allowing Royal Ripper and Bug God to attack. After cutting Garou severely, Royal Ripper is stopped by Bug God. Believing Garou to be dead, Royal Ripper leaves with Bug God and Sludge Jellyfish, with Tareo as a captive.

Royal Ripper takes Tareo to the Monster Association base and puts him in the same cell as Waganma. He tells the two to play nice, and momentarily leaves in order to regain his strength. He eventually returns to the cell, and chooses Tareo to torture for his pleasure. After threatening the boy, he decides to begin the torture, but is interrupted by Garou. Garou breaks through the wall and quickly kills Ripper by punching off his head and using the Whirlwind Iron Cutting Fist to rip his body apart. After his death, his bandages are used by Garou to wrap his wounds up.

Abilities and Powers
Being a demon level threat, Royal Ripper is a rather powerful monster. In the webcomic, Royal Ripper, Bug God, and Senior Centipede managed to injure Bang and Bomb, two upper echelon martial artists, which is quite an impressive feat. It is stated by Garou that Royal Ripper, along with Bug God and Senior Centipede, all have capabilities on par with S-class heroes, demonstrating that they are upper-class Demon-level mysterious beings. With the combined efforts of Bug God and Senior Centipede, the three managed to put Garou in a near-death state, although Royal Ripper and Bug God were injured, and Senior Centipede was killed during the battle. They also admit if they had fought Garou one-on-one, it would have been a difficult battle. That testament is later proven true, as he is killed in a single strike by Garou when he is prepared to torture Busaiku.

Physical Abilities
Immense Speed & Reflexes: Being a Demon-level monster, Royal Ripper is naturally fast. Royal Ripper managed to land an attack on Garou despite the latter having the surprise element. Royal Ripper is able to swiftly kill the monsters attempting to attack Narinki's Private Squad. Royal Ripper managed to sneak behind Garou, while the latter was distracted, and land a serious slash.

Enhanced Strength: Along with Bug God, he was able to defeat Garou and put him in a near-death state.

Enhanced Senses: Royal Ripper is capable of smelling the presence of humans near him.

Bone Reallocation: Royal Ripper has been shown to reallocate his joints and bones to have movement with more degrees of freedom. This allows him to move his blades more freely while making his blade arms less of an inconvenience.

Fighting Style
Expert Swordsman: Royal Ripper is extremely skilled with the blade. He makes multiple erratic slashes in combat.

Trivia

 * He is known as an urban legend monster in the Hero Guide book and he shows up at dawn to assault children.
 * He was killed by the technique that is very similar to Nanto Suichō Ken  (南斗水鳥拳, South Dipper Waterbird Fist, also translated as South Dipper Waterfowl Fist) used by the character Rei in Fist of the North Star series.
 * ONE stated that Royal Ripper's inside is nothing like that of a normal human, but a mixture of hair, blood, and gauze.
 * In the original webcomic, he was sent by the Monster Association, together with Senior Centipede and Bug God, to save Garou from the incursion perpetrated against him by Bang and Bomb (and also Genos that was fighting him at the scene). After Garou was appointed by the Association to kill 100 humans to prove his monsterish nature, Bug God, Royal Ripper, and Senior Centipede followed the human monster to watch over his actions; when they discovered that Garou didn't want to abandon his humanity and was also defending a child, Busaiku, they attacked him and tried to kill the child.