Characters from Kaiten Mutenmaru.
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Debut: Chapter 1The main protagonist of the entire series. His name derives from the Japanese word for "additive‐free food".
Debut: Chapter 2Mutenmaru's childhood friend.
Debut: Chapter 1A living granary capable of transforming into a Kura Sushi restaurant.
Kura Shishi no Mikoto
Kura Shishi no Mikoto
Debut: Chapter 86A fiery lion spirit sealed in one of the cards belonging to Mutenmaru's father. He becomes Mutenmaru's partner when the boy finds his card.
- Playing with Fire: He gives Mutenmaru's katana fire powers by possessing it.
Debut: Chapter 86A mermaid princess who's dreamed of adventuring because of her lifelong confinement at the hands of her well-intentioned father, King Ocean. Her singing has magical powers, including the ability to heal injuries. Her name derives from the Japanese words for "sea" and "mahi-mahi".
- Beautiful Singing Voice: Mutenmaru describes her singing voice as angelic.
- Friendless Background: She had no friends because of her lifelong confinement until she met the Isle Whale.
- Girl in the Tower: King Ocean locked her away in the strongest tower of her home since her infancy to protect her from the likes of Sick, who almost abducted her for her strong potential.
- Our Mermaids Are Different: She's a mermaid who can change into a human. As a princess, she can sing the Songs of Healing and Destruction.
- Really Royalty Reveal: The Tritons reveal her to be King Ocean's daughter.
- Tyke-Bomb: King Ocean ordered her lifelong confinement because Sick almost abducted her in infancy to utilize her great powers as a mermaid princess.
Debut: Chapter 92A female water spirit sealed in one of the cards belonging to Mutenmaru's father. She becomes Umimi's partner after the mermaid's song awakens her.
Debut: Chapter 86A simple-minded Cat Girl who loves freedom and fighting the strong. She's the leader of the Cat Thieves.
- Bare Your Midriff: She usually wears a bikini top and shorts.
- Blood Knight: Her favorite things include fighting the strong, which is why she joins Mutenmaru's group on a quest to rid the world of monsters empowered by the Abominable Crystal.
- Cat Girl: She looks human but with the ears, pupils, claws and tail of a cat.
- Cleavage Window:
- Her Qipao in the Casino arc of Journey of Light has a diamond-shaped window exposing her cleavage.
- Her outfit in the Whitoy Town arc of Wonderland exposes the top half of her chest.
- Facial Markings: She has red markings around her eyes.
- Playing with Fire: She uses fire-based attacks.
- Qipao: The Casino arc of Journey of Light features Siam in a red qipao with a Cleavage Window and one huge slit on each side.
- Sexy Cat Person: She's a curvaceous Cat Girl who dresses skimpily.
- Who Wears Short Shorts?: She wears a pair of tiny shorts in her usual clothes.
- Zettai Ryouiki: She wears short shorts and thigh-high stockings in her usual clothes.
Debut: Chapter 86An orphan turned aspiring hero themed after ninja.
Debut: Chapter 86 (partial appearance), Chapter 103 (full appearance)A magical young bear capable of human speech. His personality changes depending on the outfit.
Debut: Chapter 86 (partial appearance), Chapter 110 (full appearance)A robot chef working at the restaurant Corale in the town of Europia. Once a soldier called Tetsujin Unit 1, he's grown beyond his programming thanks to a blind old woman who mistook him for her son Granchio and taught him humanity.
Tsubukante and the Four Additive Demons
Debut: Chapter 3 (partial appearance), Chapter 4 (full appearance)The main villain of the first season. His name is an anagram of the Japanese word for "additive".
- Wouldn't Hit a Girl: When Kurara demands Mutenmaru back, Tsubukante says that he won't hit a girl.
Debut: Chapter 86The main villain of the second season. A mysterious man who spreads the Abominable Crystal to turn people into monsters. His surname derives from the combination of Valac, a demon from the Ars Goetia, and Parachloro-phenol.
- Alliterative Name: Sick Solitude.
- Classy Cravat: He wears a simple cravat that his feathers conceal until he assumes his human disguise. He wore a different cravat as a child to emphasize his noble birth.
- Died Happily Ever After: Purified by Mutenmaru, Sick returns to his human self as he reunites with Anne in the afterlife.
- Family Theme Naming: Sick has neglectful parents in Pain and Yamai Solitude, the latter of whose name means "illness" in Japanese.
- Hellish Pupils: He has rectangular pupils in his human disguise.
- I Just Want to Be Free: In the past, he wanted to be free like a bird flying in the sky.
- Locked Out of the Loop: As a child, he was kept ignorant about the tyranny of his parents over Throne and how it displeased the townspeople. This contributed to the tragedy that would befall him.
- Lonely Rich Kid: Sick had neglectful parents in Pain and Yamai Solitude, the aristocratic tyrants of Throne, and only one friend in Anne, a kind-hearted commoner his age.
- Names to Run Away from Really Fast: Sick Valachlorophenol is the main villain of the second season. The official Twitter account implicitly confirms that his surname partly derives from Valac, a demon from the Ars Goetia.
- Sins of Our Fathers: As a human, Sick had nothing to do with the tyranny of his aristocratic parents over the town of Throne. However, the poverty-ridden rebels didn't care and still targeted him during their burning and loot of his entire house, even killing his commoner girlfriend for getting in their way beforehand.
- Sole Survivor: He was the only survivor of the Solitude family after the rebels killed his transformed parents for their decadence and tyranny.
- Technicolor Eyes: His human disguise has green scleras and yellow irises.
- Tragic Villain: His soliloquy in Chapter 163 reveals that as much as he knew his actions would only make Anne sad, he could not stop himself from going mad with hatred.
- Uptown Girl: Gender inverted. Sick was a young aristocratic boy in love with Anne, a kind-hearted commoner his age.
- Was Once a Man: He used to be an ordinary human boy before turning into a monster out of despair.
- White Sheep: As a child, he was the only decent and sane member of the Solitude family, unaware that his parents were decadent tyrants.
- Wistful Amnesia: He seems to only remember about his human life that he found an Abominable Crystal as a child when he had everything taken away. That doesn't stop him from going berserk whenever Mutenmaru mentions Anne and, as stated on Twitter, whenever he reads about his past in the webcomic. If his soliloquy in Chapter 163 is any indication, though, part of him do remember Anne enough to know his actions would only make her sad.
- Would Hit a Girl: He beat Anne when his butler caught them on a date. He's apologetic about having to hide their relationship that way, though.
- You Gotta Have Blue Hair: He has green hair in his human disguise and as a child.
Eryth and Ritol Morte
Eryth and Ritol Morte
Debut: Chapter 86A pair of sisters that accompanies Sick.
- Amazing Technicolor Population: They have pale blue skin, which had a natural light tone when they were children.
- Bare Your Midriff: Eryth wears a midriff-baring top in Journey of Light.
- Hair Decorations:
- Eryth wears cross-shaped pink hairpins.
- Ritol wears a pink headband with frills on the top and ribbons on at the ends.
- Identical Twin ID Tag: They look identical except for their expressions, hairstyles, outfits, and weapons.
- Morphic Resonance: They always keep the direction of their bangs and the color of their clothes no matter what form they take.
- Sinister Scythe: Eryth wields a large red scythe.
- You Gotta Have Blue Hair: They have dark blue hair, which are pale blue in their disguises and when they were children.
- Zettai Ryouiki: Eryth wears thigh-high boots with a miniskirt.
Debut: Chapter 110A powerful monster with the personality of a playful child.
Debut: Chapter 110Tetsujin's war comrade turned foe.
- Chekhov's Gunman: Astar is introduced as Tetsujin's comrade who mocked the latter's dream to become a chef. Several chapters later, he's revealed to have been hired by Sick.
Debut: Chapter 116Astar's companion.
Debut: Chapter 121The corrupted form of Umimi Sheela. She wields the Song of Destruction against any threat to her freedom, perceived or otherwise.
Debut: Chapter 93The young CEO of Megadis, a major company that creates costumes for heroes.
- Ascended Fanboy: He was an adoring fan of the legendary hero Master Megalo as a child. He starts out as a dark example of Heroic Wannabe, but Star of Hope reveals that he's become a proper hero as Anchor Gill to atone for his crimes.
- The Atoner: He starts working as a real hero to atone for his crimes as the Corrupt Corporate Executive of Megadis.
- Chocolate of Romance: The official Twitter account of the franchise reveals that as Anchor Gill, he gets considerable amounts of chocolates every Valentine's Day.
- Corrupt Corporate Executive: As the CEO of Megadis, Crocell oversees the creation of not only costumes for heroes but also monsters in Megapolis for monetary gain and ultimately to Take Over the World as the strongest hero. Thankfully, he grows out of it.
- Engineered Heroics: He is seen in the television promising to wipe out monsters in Megapolis with costumes he creates for heroes as the CEO of Megadis. When Mutenmaru's group and Shinobu infiltrate Megadis to verify Father Brasse's suspicion, Crocell reveals that he's the one who creates monsters in Megapolis with the help of Thia to keep heroes fighting.
- Good Eyes, Evil Eyes: He used to have round, bright blue eyes — which he gradually regains after Mutenmaru purifies him — with implications that he only got narrow, angular dark eyes after exposure to the Abominable Crystal turned him into the Corrupt Corporate Executive of Megadis.
- HeelFace Turn: He goes from the Corrupt Corporate Executive of Megadis to a proper hero long after his purification.
- Sixth Ranger: Star of Hope reveals that he's joined the Anchor 4 as Anchor Gill to redeem himself.
- Take Over the World: He reveals to Mutenmaru's group and Shinobu that he wants to purge the world of weaponry, armed forces, and nations under his rule as the strongest hero.
- Used to Be a Sweet Kid: He was an adoring fan of Master Megalo as a child and, even in adulthood, he seemed to be a normal scientist until he was introduced to the Abominable Crystal. He regains his conscience after Mutenmaru purifies him of the Abominable Crystal in his hero costume as Master Megadis.
- Would Hurt a Child: He brutalizes Mutenmaru repeatedly in their duel, with implications that he would have killed the little samurai if not for the intervention of Sister Meer and Father Brasse.
Keiji, Mackerel, and Komai
Keiji, Mackerel, and Komai
Debut: Chapter 94The first people Mutenmaru's group meet in Megapolis. They all work as police officers.
Sister Meer and Father Brasse
Sister Meer and Father Brasse
Debut: Chapter 95A pair of clergy people who care for orphans. They used to work in Megadis until they found something wrong with Crocell.
- Dual Wielding: Meer wields a pair of whips in combat.
- Eyes Always Shut:
- Sister Meer only opens her eyes the moment she comes to Mutenmaru's aid.
- Father Brasse never opens his eyes.
- Miniature Senior Citizens: Father Brasse is so old that he barely comes up to Sister Meer's chest.
- Whip It Good: Meer wields a pair of whips in combat.
Thia Venta Zoa
Thia Venta Zoa
Debut: Chapter 95An eccentric scientist working in Megadis.
Debut: Chapter 97Thia's ten-year-old sister.
Debut: Chapter 86 (partial appearance)note , Chapter 98 (full appearance)A blue-haired, horned boy also known as the cocoon of the Devil. He's born from and feeds on the Abominable Crystal.
- Anti-Antichrist: Kid is meant to cause The End of the World as We Know It as the cocoon of the Devil. With the help of Mutenmaru, he narrowly averts his own fate by purifying himself and the world as planned by Thia.
- Horned Humanoid: He has a pair of yellow horns right above the ears.
- Multicolored Hair: He gains white hair with blue highlights after purifying himself.
- You Gotta Have Blue Hair: He has dark blue hair.
Throne (All spoilers unmarked)
Debut: Chapter 155Sick Solitude's commoner girlfriend.
- All-Loving Hero: She was a kind girl who wanted peaceful solutions when the commoners planned a revolt against their oppressors, Pain and Yamai Solitude. She even believed that aristocrats were people and thus could be reasoned with — something she apparently learned from Sick, the innocent son of the Solitudes. Unfortunately, the rebels killed her in a blind rage for stepping between them and Sick.
- All There in the Manual: Her surname is only found in the her cards◊.
- Death of a Child: She was not even in her teens when the poverty-stricken rebels killed her in a blind rage for stepping between them and Sick, who had nothing to do with the tyranny of his aristocratic parents over the town of Throne.
- Exotic Eye Designs: She had cross-shaped pupils.
- Morality Chain: Her death, along with the corrupting influence of the Abominable Crystal, was the cause of Sick becoming the monster he is today.
- Only Friend: Sick described Anne's smile as the only source of light for him.
- Technicolor Eyes: She had crimson scleras with pale red pupils.
Pain and Yamai Solitude
Pain and Yamai Solitude
Debut: Chapter 156The aristocratic tyrants of Throne. They were also Sick's neglectful parents.
- Aristocrats Are Evil: Although Sick himself Used to Be a Sweet Kid, the poverty-ridden rebels targeted him solely for being the son of Pain and Yamai Solitude, the aristocratic tyrants of Throne.
- Foreshadowing: The portrait of them as a happy couple in Chapter 156 shows Abominable Crystals embedded in their rings. During the rebellion, it turned them into monsters.
- Four Eyes, Zero Soul: Pain was the spectacled tyrant of Throne who used the money of the town only for aristocrats.
- Parental Neglect: It's heavily implied that they were neglectful of Sick:
- Pain didn't want Sick involved in his business, so he coldly had their butler send the boy to his room. Sick promptly asked why Yamai never returned home, only for his butler to tell him that he didn't have to know everything. The butler had a good reason for keeping Sick ignorant since Yamai's card◊ reveals that she was away gallivanting to satisfy her unfulfilled desire and out of sloth.
- Sick told Anne that his bouquet for her had no one in his house to see it and that he would rather share her few simple sandwiches than eat luxurious food alone in his house.
- Sadist: Yamai's hobby was abusing the poor with her hounds.
- Used to Be a Sweet Kid: The portrait of them as a happy couple in Chapter 156 shows Abominable Crystals embedded in their rings, implying that the crystals corrupted them into the tyrants as the townspeople of Throne knew it. Pain's card◊ even states that he put much effort into the good of people before losing sight of it.
Debut: Chapter 89The ruler of the sea. He is also Umimi's strict father who has confined her since she was a baby.
- Papa Wolf: It's revealed that he's locked his daughter, Umimi, away to protect her from the likes of Sick, who almost abducted her in infancy for her strong potential.