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In General
- Greater-Scope Villain: For the original Moe! Ninja Girls volume, they're (sometimes directly) involved in nearly every single problem the Ninja Seeking Club encounters, even before they're officially introduced.
- Nebulous Evil Organisation: The organization has multiple goals that don't seem connected save for causing mayhem and destruction, such as releasing the Nine-Tailed Fox and Yamato-no-Orochi, or assisting the Rappa's coup on the Fuma clan.
Yatagarasu Assassin
Masked
Unmasked
A member of the organization that abducted Tengge's body for experimentation. His first actual appearance is in Season 16, in which his civilian identity is revealed to be the ski instructor of the resort town Ochatomizo and Mizaki are both taking field trips to. Season 17 also reveals that he's a teacher at Ochatomizu, which is how he gained control of YTG8.- Arc Villain: Of the Book of Tengge, having played a part in Tengge's torture in order to uncover an artifact she hid.
- No Name Given: He's only referred to by his titles, even in his civilian identities.
Dark Myu
A More than Mind Control version of Myu that seeks vengeance against evildoers, drawn out by Yatagarasu agents, and the embodiment of a desire that has existed since the death of a friend during her youth. For tropes pertaining to both versions of Myu, see her section in the "Ninja Seeking Club".
- Declaration of Protection: There is also a Dark Fuu, who's not brainwashed; rather, she knows that Myu's desires are at least partly genuine instead of solely affected by outside influences, and tags along to protect her (as well as try to prevent her from causing unnecessary casualties).
- Evil Costume Switch: Her outfit, secretly gifted to her by the Yatagarasu, is mostly black, with sheer material exposing her stomach and legs.
- Knight Templar: Dark Myu's modus operandi is to punish ninja that she believes have escaped justice. The fact that many of these criminals are in possession of things the Yatagarasu want is just her being Necessarily Evil.
- More than Mind Control: Myu genuinely did have a secret desire to gain enough power to judge and punish others due to a childhood incident, but the Yatagarasu use their brainwashing techniques to uncover and exploit it.
- Necessarily Evil: Considers herself as such, when it's pointed out by the Ninja Seeking Club that determining who's deserving of her punishments makes her prideful and malevolent.
Kato Kankuro
A ninja from Myu's past, and the source of most of her present-day trauma. The events of the Book of Darkness reveal he's a member of the Yatagarasu.
- Alliterative Name: Kato Kankuro.
- Arc Villain: Of the "Book of Darkness" arc.
- The Faceless: He's never shown at all during flashbacks to Myu's youth. In the present, his portrait is just the silhouette of last arc's Yatagarasu Assassin.
- Karmic Death: Survived a death by burning years ago, but when the Ninja Seeking Club destroys the Scroll he stole, his summoned Beast bursts into flames, falls on top of him, and reduces him to ash.
- Kill It with Fire: He's presumed to have died this way, when he and Itsuki were trapped within a burning shack. He survived, but due to his misdeeds, a flaming beast burns him to a crisp.
- Master of Disguise: Managed to perfectly pass himself off as a much older, and unscarred, man while overseeing Dark Myu's assassination training.
- Not Quite Dead: Supposedly perished in Myu's childhood, taking Myu's friend Itsuki out with him...but when Hotaru tries to channel his spirit using his recovered old weapon, she can't, and comes to this conclusion. It's revealed in the arc's finale that he's been the one brainwashing Myu.
- Scars Are Forever: When he reveals himself in the present, half his face is covered in burn scars due to Itsuki's explosive sacrifice years ago.
- Summon Magic: He still has the Beast Seal Scroll he stole years ago, and summons a giant crow beast during the arc's finale.
- Would Hurt a Child: Attempted to kill a younger Myu, who was just playing hide-and-seek when she accidentally witnessed him stealing one of the village's Beast Seal Scrolls.
Masamune Sendo
His "Book of Rival Swords" appearance
A Yatagarasu member obsessed with destroying the Kamuy using his own sword, the Maguy.- Adaptational Heroism: He did not go off the deep-end in the RPG storyline, continuing to become Sakurako's swordsmithing apprentice.
- Always Second Best: His motivation for fighting against Kazuki is this, as his blade will never outshine Kazuki's unless it's victorious in combat.
- Arc Villain: Of the "Book of Rival Swords" arc.
- Came Back Wrong: After his defeat at the end of Season 24, which includes the Maguy (which he had mentally bonded with) fracturing, his next appearance has him solely devoted to killing Kazuki and Sakurako with little awareness for anything else around him.
- Evil Mentor: To Setsuna, lending her the Maguy and pointing her towards retired ninja to "help" her on her quest for vengeance.
- Eye Scream: After unleashing the power of the Maguy and coming back wrong, his eyes become permanently bloodshot, and the area around his left eye is covered in veins.
- Killed Off for Real: In the visual novel's Season 26, after Kikuko strikes a fatal blow on him.
- More than Mind Control: The Maguy's rivalry with the Kamuy, combined with Sendo's own malcontent towards the Kamuy, leads to their spirits fusing in Season 24's climax rather than Sendo simply being controlled by the Maguy's spirit.
- Power at a Price: He eventually learns to channel his life energy through the Maguy in order to release a powerful burning smoke, but requires constant healing for his body to avoid decaying.
- A Pupil of Mine Until He Turned to Evil: He used to be Sakurako's pupil, but the thought that he'd never be able to craft a blade stronger than the Kamuy drove him mad.
- The Rival: The Maguy was originally created a thousand years ago to specifically counter the Kamuy and, like the Kamuy, has its own spirit that considers the Kamuy its rival.
- Treacherous Advisor: He's been manipulating Setsuna to attack innocent ninja, including blaming Kazuki for her father's crippling, to further his own ambitions. The Ninja Seeking Club even theorize that it was a Yatagarasu ninja that dueled Setsuna's father to spark the whole conflict.
Fake Negoro Leader
A nameless member of the Yatagarasu that kidnaps the real leader of Negoro village and poses as him during the Ninja Summit, with the goal of delaying them until it's too late to foil their latest plan.
- Depraved Homosexual: When he traps Ricka and Kazuki with shadowy tentacles when they attempt to spy on him, he admits that he's less interested in Ricka's body than in Kazuki's, who reacts with disgust.
- Human Popsicle: When Kurenai sees him using shadow tentacles to bind Ricka, she freezes all of the moisture inside of his body, reducing him to this state and making him suffer without killing him.
- Hypnotic Eyes: When Myu and her mother get a vision of their village being attacked during the Ninja Summit, he uses this technique to knock them unconscious and prevent them from warning the other leaders.
- Out-Gambitted: He attempted to manipulate the Ninja Summit, but it turns out the entire event was secretly a ruse to bait potential Yatagarasu infiltrators like him.
Sheea
- Elite Four: She's considered one of the "three legs" that are the Yatagarasu's top agents.
- Evil All Along: She's thought to be a completely normal civilian that, in Season 24, got wrapped up in the latest incident by accident...right up until she reveals she's been with Yatagarasu from the start, tries to kill Akari, and then flees with a wounded Sendo, broken Maguy, and the last orb needed to summon the Yamato-no-Orochi.
- The Farmer and the Viper: Even after her treachery is revealed, some members of the Ninja Seeking Squad believe that her past kindness wasn't entirely an act, and are willing to spare her life. And every time, once she's given a chance to recover, she escapes in order to further Guten's ambitions.
- Killed Off for Real: After being spared in Season 27, and surviving a major wound from a berserk Kazuki in Season 30, she's ultimately devoured by Orochi later in the latter season.
- No Full Name Given: At no point in the original Visual Novel is Sheea's last name revealed.
- Obfuscating Stupidity: Her clumsiness was mainly a ruse in order to cast away suspicions.
- People Puppets: During the battle against the Scarecrow Corps at the end of Season 25, she uses her jutsu to control their limbs, forcing them into shooting each other.
- Treacherous Advisor: In Chapter 4 of Season 26
, Sendo asks what her relationship with Iroha is. Sheea states that Iroha's actually a descendent of the Yabu ninja family that she first met during an undercover mission, and Sheea tricked her into believing she was an agent of justice and that her family had sworn to support the Yatagarasu. - Two Aliases, One Character: To deceive the Ninja Seeking Club, she introduces herself as Suzu Sagisawa.
- Walking Spoiler: Her civilian identity is introduced in Season 20, but her true nature isn't revealed until the very end of Season 24.
- Was It All a Lie?: Is asked this by Akari when the younger girl is kidnapped by the Yatagarasu, asking if she truly felt no joy interacting with the club as her cover identity.
Hakua
Hakua with his face mask on
A blue-haired, male member of the Yatagarasu, who mainly wields daggers.- Blood Knight: When in battle against the MEA, he absolutely slaughters them, decapitating some soldiers to mess with others before killing them as well.
- Demonic Possession: The Yamata-no-Orochi uses him as a temporary vessel in the final season.
- Elite Four: He's considered one of the "three legs" that are the Yatagarasu's top agents.
- Psycho Supporter: He's devoted to Guten, rubbing against him like a loyal dog before slaughtering their enemies, and sports a maniacal grin if fighting without his face mask.
Kokua
- Elite Four: He's considered one of the "three legs" that are the Yatagarasu's top agents.
- Killed Off for Real: After being sealed in a dimensional rift in Season 27, he returns in Season 30, only to end up devoured by Orochi to renew its power.
- The Lost Lenore: When confronted by Kazuki's father in Season 27, he admits to not having the will to kill the Ninja Seeking Club. When asked if he's a parent, he only replies "I was." In Season 30, he states that he had a wife and son and is eager to join them as he lets himself be consumed by Yamato-no-Orochi.
- No-Sell: When the MEA attempt to kill him, he doesn't even flinch from their bullets, and effortlessly tears them apart with his bare hands in retaliation. Later, when the Club confronts him, the Kamuy can't pierce through his skin and Enju's daggers shatter against it.
Iroha Yabu
Iroha's Yatagarasu uniform
Iroha in a casual outfit
A high-ranking member of the Yatagarasu, who was manipulated by Sheea into believing they fight for a just cause.- Desperately Looking for a Purpose in Life: In the story that Sheea tells about how she met Iroha, Iroha was a descendant of a long-forgotten ninja clan, inheriting Healing Hands and hoping it meant she had a higher purpose...which let her be easily manipulated by Sheea.
- Elite Four: She's not one of the Yatagarasu's "three legs", but she shows up in the same Season where they are formally introduced and helps contribute to their bloodshed via empowering a broken Sendo.
- Feuding Families: The Yabu and the Kashiwa, Nanao's ancestors, are said to have feuded for generations, continuing to the present with Iroha being The Rival to Nanao. Although the prime motivation behind it is the Yabu being Always Second Best, as the Kashiwa had better control of their powers to the point of using a Vampiric Draining version of it, old records in Iroha's house state that the feud also involved being the first to claim desserts or rare wall scrolls (mirroring how Iroha agitates Nanao).
- Healing Hands: She's capable of using healing techniques, which she uses to keep Sendo alive after his duel with Kazuki leads to the Maguy (and his bonded spirit) shattering.
- Heel–Face Turn: After her defeat, she's shown to be much friendlier with the Ninja Seeking Club, providing aid in Season 30 and even bonding with Nanao after they apply to the same medical university.
- The Rival: After first witnessing her in action via the MEA's surveillance, Nanao recognizes her as a girl that had antagonized her when she first moved to town, popping up whenever Nanao was about to purchase the last croissant in a bakery or rare copy of a book to take the item and buy it before Nanao could. However, this aspect is toned down after Iroha's Heel–Face Turn and becoming friends with Nanao.
Divine Emperor Guten
Guten's Yatagarasu uniform
Guten in public
The leader of the Yatagarasu.- Animal Motif: Fitting for the head of an organization named after a three-legged crow, he has a cloak of black feathers and a belt insignia that looks like a crow's head.
- Bad Boss: In Season 30, he willingly lets all of his top subordinates be Killed Off for Real via Orochi devouring them for power, which he then sacrifices to combine with his own.
- Belated Love Epiphany: In the True End of Season 30, he doesn't realize that his lifetime of ostracization had finally ended, and he had gained the actual love and respect of Sheea, Kokua, and Hakua, until the spirits of his underlings reach out to him one last time before they're completely consumed by Amatsu-Mikaboshi. It's this realization that leads to him releasing Kazuki from the fusion and letting him re-seal the god.
- Big Bad: Of the original Moe! Ninja Girls volume, as every previous member or ally of the Yatagarasu that the Ninja Seeking Club fought reports to him.
- Chekhov's Gunman: His first appearance is early in Season 25, posing as a civilian, before his identity is revealed at the end of that same season.
- Dark and Troubled Past: He reveals his full backstory during the climax of Season 30: he was born to be Amatsu's vessel, but only had a portion of the god's power. He was feared by his village and abandoned in the woods as an infant, when he was found by the Yatagarasu. He grew up as a part of the organization, but they feared him as well, sending assassins after him when he was just a child, but he was able to kill all threats against him and take charge of the organization.
- Evil Cannot Comprehend Good: In the Happy End of Season 30, due to his own lifetime of hardship, Guten can't believe in Kazuki's own memories of good times with the Ninja Seeking Club and desire to protect humanity, which prevents them from fully fusing and lets Kazuki escape.
- Evil Is Not a Toy: During the events of Season 27, the Ninja Seeking Club prevent him from using Akari to command the Yamato-no-Orochi. This leads to the ancient beast blasting Guten through a wall before trying to go on a rampage, though Guten lives and is still strong enough to put up a fight against the Club before being (briefly) apprehended afterwards by the MEA.
- Omnicidal Maniac: His ultimate goal, as revealed in Season 30, is to reform Amatsu Mikaboshi, who desires nothing less than the destruction of the world, having been denied a presence in it and his being shattered by the more benevolent gods.
- Power Floats: Guten is powerful enough that, when he finally faces the Ninja Seeking Club in Season 27, he is able to hover in midair without even invoking his Reality Warper powers.
- Reality Warper: While ninjutsu in the Moe! Ninja Girls setting must be preceded by an incantation, all Guten needs to do is say one-word phrases like "tremble" or "burn" (which, respectively, causes an earthquake and turns boulders into flaming meteors), and the narration describes it as nature itself bending to his whims.
- Reincarnation: In the climax of Season 30, he combines Yamato-no-Orochi, himself, and Kazuki's inner darkness to reincarnate into Amatsu Mikaboshi, a Shinto god. Inside of Amatsu, he then tells Kazuki how he was born to be the god's host, but only incarnated with half of his power, with the rest going to Kazuki when he was born.
- Worthy Opponent: He's impressed by Kazuki during their confrontation in Season 27, to the point of offering a genuine We Can Rule Together offer. For the rest of the Club, however, he doesn't hesitate in trying to kill them.
Yamato-no-Orochi (Spoilers)
Orochi possessing Akari's body
Orochi's true form
The multi-headed serpent of legend, whose revival is thought to be the culmination of Guten's master plan, but is later revealed to merely be the penultimate step.- Demonic Possession: It's first summoned by Guten using a kidnapped Akari and Sendo's Maguy sword as tools in order to control the beast, causing its initial form to be that of a possessed Akari. In Season 30, due to weakness after being trapped between dimensions by the Ninja Seeking Club, it possesses Hakua until growing tired of Guten, devouring the body as well as those of Kokua and Sheea to regain its true form.
- Sealed Inside a Person-Shaped Can: When Guten summons him in Season 27, he uses Akari and the Maguy sword as a conduit, as the power of the Izumo weakens Orochi just enough for Guten to take control of it. When the Ninja Seeking Club remove the sword, Akari returns to normal, but it also allows Orochi to rampage in its true form until the club can seal it between dimensions.
- Unwitting Pawn: When it returns in Season 30, it believes that Guten is once more underestimating his strength, and devours all of his top lieutenants to re-empower itself before taking on Guten himself. Then Guten, with ease, sacrifices Orochi in order to achieve his true goal: reincarnating into Amatsu Mikaboshi.
Amatsu-Mikaboshi (MAJOR Spoilers)
- Omnicidal Maniac: In the original volume, after its spirit is reunited, its goal is the destruction of the universe it was denied from interacting with.
- Walking Spoiler: Its mere existence not only spoils the Yatagarasu's volume-long machinations, but also the plans of the Black Mage Guild in The College Years.
- Who Wants to Live Forever?: When Amatsu makes an appearance in The College Years, it's tired of the world after having already been beaten in the original volume, and would prefer that Kazuki becomes a deity in its place.
