All spoilers regarding Volumes 1 through 7 are unmarked.
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Mamoru Sakazaki
Mamoru Sakazaki
Basara's homeroom teacher, and the first teacher he meets upon transferring in.
- Adults Are Useless: Initially averted when he talks down Donoue's gang for going after Basara in a fit of jealousy regarding Yuki and Mio, in volume 1, but played straight in volume 4. Not only does he see Donoue prepare to strike Rikka and do nothing about it, but when Basara interferes to restrain Donoue, and Donoue draws a box-cutter, intending to use it, Chisato and Nanao have to deal with it, and then Sakazaki tells him to be cautious around Chisato.
- Asshole Victim: Killing the real Sakazaki is usually an unforgivable act, but the guy had it coming, considering the fact that he at least tried to rape a female student. Chisato turned a blind eye to the killing as a result and no one misses him when Chisato finally blows him up to protect Basara.
- Bodyguard Crush: Completely one sided. Being tasked by Heaven to be Chisato's subordinate and protector, he developed twisted and unrequited feelings for Chisato. She turned a blind eye to it until he decided to go after Basara. Even worse for him is that after Chisato vaporizes him, she proceeds to have sex with Basara as a means of also healing him.
- Character Death: He gets disintegrated by Chisato.
- Cool Teacher: At first, he seems like a teacher beloved by students and faculty alike.
- Crazy Jealous Guy: He just can't take it when his target of affection says "no."
- Dead All Along: It turns out that he was killed by Ornis and impersonated him until he gets exposed by Basara and Chisato.
- Didn't See That Coming: Basara getting up and slamming him through several walls, after his arm was cut off, took him by surprise.
- Dirty Coward: When Basara proves able to deliver a decent fight, he uses Kurumi as a hostage.
- For Your Own Good: He tries to claim that killing Basara is in Chisato's long term best interests. Chisato strongly disagrees.
- Hoist by His Own Petard: Sakazaki manages to combine this with Saying Too Much. Him accusing Chisato of being suspicious is what tips off Basara.
- Humans Are Insects: He views humans as "eternal slaves of the gods" and of no significance.
- Kneel Before Zod: After revealing his true form, he demands Basara kneel before him, Basara wisely refuses.
- Light Is Not Good: He is a "god" from heaven and attacks with light, but he's utterly monstrous.
- Manipulative Bastard: He fights by hiding behind people.
- People Puppets: He can control people and channel magic attacks through them.
- Terrifying Rescuer: In Burst, he explodes the real Sakazaki as the man was preparing to rape Rikka.
- Too Dumb to Live: It's not very wise to accuse Chisato of being suspicious or use students as People Puppets.
- Yandere: He was fixated on "protecting Chisato's beauty" to such an unhealthy level that he was perfectly willing to endanger the school, and then try to kill Chisato herself for being insulted at the idea, and protecting Basara.
Chisato Hasegawa
Chisato Hasegawa
Voiced by: Yuu Asakawa (Japanese), Wendee Lee (English)
The extremely beautiful school nurse, Hasegawa had kept a distant eye and a friendly ear for Basara. Her advice to him, even when he purposefully kept her in the dark about his dealing with demons and the heroes, was always spot-on. Later on, it becomes apparent that she has much more than a passing interest in the young Basara.
See her page here.
Nanao Tachibana
Nanao Tachibana
Voiced by: Asami Tano (Japanese), Laura Stahl (English)
A student who serves on the school's newspaper club.
See her page here.
Yahiro Takigawa
Yahiro Takigawa
Keep an eye out for him.
Voiced by: Tomokazu Sugita (Japanese), Ray Chase (English)
The only male student to hang out with Basara and not try to harass him due to being immediately targeted by the school idols Yuki and Mio when he transferred in.
- Big Bad Friend: He's actually Lars, an agent of Zolgia, and responsible for most of the demons going after Mio early in the story.
- Blindfolded Vision: When he wears a mask, that mask doesn't have slots for his eyes, yet this doesn't affect his vision in any way.
- Casting a Shadow: In addition to "puppet demons," he can unleash darkness-based attacks in some very creative, and explosive, ways.
- The Dog Bites Back: He gets back at Zolgia at the end of volume 3.
- Double Reverse Quadruple Agent: Let's just say he's got his fingers in a lot of pies.
- Enemy Mine: For a while with Basara. While they're not exactly allies, they do have similar goals and interests.
- Forgiven, but Not Forgotten: Yuki makes crystal clear at the end of Volume 3 that while she understands Lars's earlier actions and antagonism were a Necessary Evil, and she accepts it, she still can't bring herself to forgive him for hurting Basara. Mio is shown to share the same sentiment but doesn't voice it out loud.
- Impaled with Extreme Prejudice: He gets stabbed by Zest after he warns her that the demon lord was growing suspicious of Zolgia's actions. She impales him with her fist, then sets his corpse on fire. His death is subverted when it's shown to be one of Lars's puppets that was "killed" by her.
- Information Broker: In the anime, Basara buys information on the demon world from him by treating him to fancy meals in high-class restaurants.
- In-Universe Catharsis: He settles the score with Zolgia for his involvement in his hometown's destruction.
- It Amused Me: The primary reason he hangs out with Basara at the start is because he thinks it's amusing.
- The Legions of Hell: He can summon and control presumably non-sentient low-level demons just about anywhere whenever he wishes. This includes artificial mimic bodies which allows him to fool enemies into thinking he's been "killed."
- The Nicknamer: He calls Basara "Basacchi." (Basara+Ecchi) Basara doesn't seem to mind.
- One Degree of Separation: He was raised in the orphanage where Mio's human adopted parents worked. He took their deaths... poorly.
- Saying Too Much: Basara is able to sniff him out because he accidentally drops quite a few hints regarding his true nature, such as being startled at the appearance of "demon puppets" that normal humans can't see.
- Stealth Mentor: All his antics and antagonism at the start, especially the breaking speeches, and presumed evil-gloating? All for the sake of making Mio more effective at fighting Zolgia without "technically" betraying his master, who he wants vengeance on.
- White Mask of Doom: He wears one every time he's in combat as "Lars."
- Wild Card: He is no longer directly antagonistic towards the Tojo Household but he supports the Demon Lord Faction which puts him at odds with them.
- You Have Outlived Your Usefulness: Lars suffers this from Zest after he brings Basara to her in exchange for Mio. She promptly impales him with an attack, then sets him on fire. Lars however was apparently prepared, as he reappears later none the worse for it.
Shohei Donoue
Shohei Donoue
Voiced by: Hiroki Eto (Japanese), Grant George (English)
The leader of a gang of delinquents that takes an immediate dislike to Basara because Basara caught the eye of both Yuki and Mio upon transferring in.
- Break the Haughty: Chisato forced him to publicly bow and apologize to Rikka for assaulting her and threatening the festival.
- The Bully: He certainly acts like one. He's quick to lash out or resort to violence against junior students when things don't go his way.
- Crazy Jealous Guy: He's very jealous of Basara due to the latter's relationship with Mio.
- Delinquent Hair: Especially in Japan. He's got blonde hair, combed into a prominent spike at the center of his forehead.
- Entitled to Have You: To Mio. He thinks that if he's overtly "too friendly," she'll immediately fall head over heels for him. He refuses to accept how utterly wrong he is.
- Hair-Trigger Temper: He gets angry at even the slightest provocation.
- Instant Fan Club: He is the self-proclaimed leader of the "Princess Mio" fan club.
- Mugging the Monster: When Nanao comes to check up on him, to ask him to return to school, he attacks Nanao and knocks off the kid's glasses, only to notice too late that Nanao's eyes turn blood red.
- Never My Fault: During the festival, Donoue sneaks around behind the accounting and student president's back to order custom-made expensive fireworks purely to spell out the kanji for Mio's name when they explode in the night sky, and then hides the invoice. When he's called out on it, he blames Rikka by calling her "selfish."
- They Just Dont Get It: He's so completely baffled by Mio telling him off, that he's convinced himself he's simply not in her face enough, and repeatedly fails to comprehend that his very "persistence" is a huge part of why she doesn't like him.
Rikka Kajiura
Rikka Kajiura
Voiced by: Yu Shimamura (Japanese), Deneen Melody (English)
The school council president.
- Attempted Rape: In the anime's rendition of Chisato's flashback, Sakazaki pins her down to a school desk, rips off her clothes, and tries to rape her before Ornis shows up and kills him.
- Beleaguered Bureaucrat: She has to put up with Donoue, who not only recruits a gang and threatens to sabotage the festival for failing to get his way by being insistent on using fireworks despite 1.) going over-budget buying them without permission and 2.) not displaying any knowledge in setting them up safely, but initiates violence upon her when she refused to buckle to his extortion and flat-out told him "no means no."
- Butt-Monkey: The poor girl just can't get things to go well for her, for any length of time. Not only does she suffer a great deal during the sports festival, thanks to Donoue and Sakazaki, but in the volume 6 side-story Christmas Celebration, she suffers two humilating draws from the "misery lottery" game that is part and parcel of the celebration tradition originally orchestrated by Jin when he was a student at school. The first is walking around without underwear until the celebration is over. The second is getting her chest rubbed by Basara for five minutes. It shouldn't surprise anyone what the result is. What's worse is that it's revealed over the course of that chapter, that the rest of the sports festival committee is ribbing her into it because she drew the exact same lots last year during that celebration, and refused to participate, defying "the curse" of the game, where refusing to participate will cause the next sports festival to go poorly.
- Curtains Match the Windows: Black hair and eyes.
- Student Council President: She's the leader of Hijirigasaka's student council.
Shiho Aikawa and Chika Sakaki
Shiho Aikawa and Chika Sakaki
Voiced by: Misato (Shiho) and Saeko Zogo (Chika) (Japanese), Jeannie Howard (Shiho) and Cindy Robinson (Chika) (English)
Mio's classmates and closest friends prior to meeting Basara.
- Brainwashed and Crazy: They get controlled by Zolgia and then Ornis to pursue Mio and Basara respectively.
- Flat Characters: They are Mio's human friends... and that's all here is to know about them.
- Locked Out of the Loop: They don't have any idea of the supernatural shenanigans surrounding Basara, Mio, Yuki, or their school.
- Muggle Best Friend: They are ordinary humans with no supernatural ability, and are the closest people to Mio prior to Basara.
- Nice Girl: They're both gentle and kind. Their friendship with Mio is genuine.
- Those Two Guys: They are always seen together, even when apart from Mio.
