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Main Cast
Tetsuo Takahashi
Tetsuo Takahashi
A biology teacher at Shibasaki High School. Takahashi was always interested in working with demi-humans but was never allowed to do so due to their rarity and lack of government aid. As luck would have it, he'd encounter four demi-humans at the very school he works at, and so he interviews them to gain a better understanding of demi-humans.
- Alliterative Name: His first and last names both begin with "T".
- Audience Surrogate: He's primarily the one who'll ask the questions the viewers are probably asking, being the interviewer and all.
- Beady-Eyed Loser: He noticeably has dot-like pupils with barely any iris, and Hikari sometimes makes fun of him for being a bit older than most.
- Buxom Beauty Standard: Subtle hints reveal him as such a person.
- He finds hugging Machi's body as crossing the line of professionalism and very inappropriate behavior for a teacher.
- Whenever Satou uses her Living Aphrodisiac powers, he tries to advert a Male Gaze to her chest.
- When Satou gave him an official taste of her seduction powers during an interview during Episode 9, he was able to conceal the effect it was having on him. However, when she decided to not "cheat" for his affection and earn it fairly, she zips up her jacket and accidentally gets her boobs caught, revealing how large they are in the process. Upon seeing this, he loses his composure and almost has a total breakdown.
- Satou appears to have realized this preference and attempts to capitalize on it during the Beach Episode to flirt with him. Once she reveals her bikini, he has a few Male Gaze moments.
- He secretly enjoys seeing women in clothing that accentuates their bust, such as tank tops and form-fitting aprons.
- Chick Magnet: Kyouko and Sakie have things for him, and both Hikari and Yuki have been flustered around him a couple of times.
- Cool Teacher: Students consider him among the most sociable teachers. He isn't afraid to have frank conversations with his students and doesn't mind discussing sensitive topics. For example his conversation with Hikari concerning a vampire's sex drive (particularly whether blood-sucking is as Hemo Erotic as stories and legends portray it as), without entering the realm of harassment or having ulterior motives.
- Covert Pervert: He's just as affected by Satou's Succubus-ness as any other dude, he's just better at hiding it. Also, it's implied he believes in a Buxom Beauty Standard.
- Foil: He and his old friend Souma are complete opposites. Souma has a handsome appearance and works at a university, a job far more prestigious than a high school teacher, but he's a big oddball behavior-wise. Takahashi more thickly built and is a high school teacher, but he connects easily with his students.
- For Science!: How Machi and Satou try to trick him into romantic situations. Neither are bold enough to do it on their own initiative, so Hikari and Ugaki respectively push them.
- Genius Bruiser: Not that there's fighting here. Takahashi, however, is very muscular for a biology teacher. You'd think he wrestled pigs growing up or something. Machi is particularly fond of his arms.
- Gentle Giant: For a simple biology teacher, Takahashi's huge. Even Hikari's first words after meeting him are to just point and say "You're huge!" That said, he's a very decent guy.
- Heroic Build: He's a Nice Guy who genuinely wants to learn about, and befriend, the monster girls. He also has the physique of a god.
- Hunk: Satou and Machi seem to think so. He's admittedly rather built for a simple biology teacher.
- In-Series Nickname: Students call him "Tetsu-sensei." Due to what "Tetsu" means (iron), fan-translation translates that to "Ironman." In both cases, it lampshades his Genius Bruiser nature.
- Insecure Love Interest: Kurt deduces Takahashi hasn't made a move on Sakie because he's insecure about his feelings for her. He's clearly attracted to her physically and mentally (she's even an embodiment of several fetishes) but makes up excuses to not pursue her.
- Intergenerational Friendship: He's closest to Hikari (considering he calls her by her first name, allowing which is a sign of endearment in Japan). That said, they're Just Friends due to him being a teacher and several years older.
- Male Gaze: While good at hiding it, he's not able to resist Satou's seductive powers. Whenever she loses control of them in his presence, he will helplessly steal a glance at her bosom and curves. One of the reasons Satou likes and appreciates him is because he actually makes an effort not to act upon the urge and maintain an air of civility between them, which most men are unable to do.
- Muggle: He's the only pure human member among the main cast.
- Nerves of Steel: On the contrary to Satou's assumption, her seductive aura does affect him. However, he's just really good at hiding it. As a bonus, his name contains the Japanese word for "Iron".
- Nice Guy: A good teacher who always has his door open for his students, who makes the demi girls feel welcome and relaxed, who has gradually made them less ostracized, who has become a dear friend to them, and a person with integrity to rely on. This, of course, is the main reason Satou likes him and wants to be with him. The guy's just awesome.
- Not So Above It All: Satou thinks he's immune to her natural charms. He isn't really, he just has a world-class poker face.
- Oblivious to Love: Machi and Satou are crushing hard on him, but he's completely unaware of it. He's also not quite sure whether he likes Satou back, as the lustful effect that she produces interferes with his rational thinking; still, he considers her a friend and colleague. He seems to be under the mistaken impression that Satou enjoys using him as a platonic test subject to experiment her succubus powers on because he's been suppressing how much of an impact they have on him.
- Perma-Stubble: Sports a thin goatee at all times.
- Reasonable Authority Figure: He may be interviewing the girls, but he's also their teacher and still manages to keep a hold of his authority.
- The Reliable One: For the Demi girls and Satou. Deconstructed in episode 11 when it is wondered if he is going too far or making the girls dependent on him. Reconstructed in the same episode where it is shown he isn't going too far, and showing that being reliable is inspirational to the other students.
- Running Gag: In the anime, whenever the girls hear Takahashi say something that gets their hearts racing, the words echo again in their head, but sounding more baritone and sensual each time it's repeated. It doesn't help since his voice actor is Junichi Suwabe, who is known for his deep and suave voice.
- Science Hero: He uses his expertise in biology and The Scientific Method to help the students and Satou feel at ease about their unique abilities. Rather than base his judgment on prejudicial or tragic mythological tales, he attempts to ground them on actual facts. With the exception of Satou, the demi-humans are mostly harmless in their current condition.
- The Smart Guy: He is a biology teacher. Despite the general public's lack of knowledge of demi-humans, his already existing knowledge of human physiology also proves quite useful.
- Smoking Is Not Cool: Takahashi smokes on very rare occasions, so far smoking only one with Ugaki after his last one years ago. When Hikari smells it, however, she's instantly revolted by it.
- Spiky Hair: Which Takahashi notices he has in common with Machi.
- Stern Teacher: Invoked. He has almost no conditions regarding the demis approaching him for help, but he does not abide that they get bad grades, as Hikari finds out.
- Tall, Dark, and Handsome: His imposing figure is one of his defining features, commanding respect out of the demi girls, and causing Satou to like him as a man.
- Thinking Out Loud: Takahashi has a bad habit of doing this, sometimes at the worst moments.
- Vague Age:
- He's called an old man by Hikari and Sakie notes the age difference between her and him is greater than her and the girls (24 vs 16ish). Whether this leads him in his assumed thirties is unknown.
- Kurt has stated Takahashi's age is not quite 10 years apart from Sakie, though the insinuation indicates it's close. Sakie was confirmed as 24 in a previous chapter.
Hikari Takanashi
Hikari Takanashi
A vampire girl. Hikari is a very hyperactive girl who often causes trouble for the other characters.
- Agony of the Feet: Hikari usually pitter-patters around her house in bare feet in casual clothes. She learns the downside of this when she stubs her pinky toe on a table leg.
- Ambiguously Gay: In addition to the stuff mentioned in Les Yay over in YMMV, Chapter 43 has Hikari become outright drunk off Sakie's seduction, which would normally only work on men, due to vampires naturally linking the processes of eating and fulfilling sexual desires.
- Animal Motifs: Housecat for her playful nature, her hairstyle even makes her look like she has cat ears and when especially mischievous her face becomes cat-like. Also, as can be expected, the vampire bat.
- Annoying Younger Sibling: Inverted. Hikari is the older twin, but her twin sister Himari is irritated by her irresponsible and carefree attitude. Himari still loves her, of course.
- Book Dumb: Her grades are simply awful, to the point that as early as Chapter 3, Takahashi has to pay a visit to the Takanashis just to discuss her grades.
- Character Tics: She sometimes has to nibble on things or people (without breaking the skin) to appease cravings to bite stuff.
- Childish Older Sibling: She's energetic, carefree, and almost completely reliant on her more mature younger twin sister Himari for self-care.
- Cuddle Bug: She is very fond of hugging Yuki, even before they become friends. This is due to the fact that Yuki is naturally cold, providing a refuge from the heat. It later becomes a less self-serving effort from Hikari, as the girls grow mutually fond of each other.
- Curtains Match the Window: Yellow eyes to match her blonde hair.
- Cute Little Fangs: Well, she's a vampire, sure, but this also indicates her bubbly personality.
- Daywalking Vampire: Defying the vampire archetype, Hikari does not perish when exposed to sunlight, although it stresses her out and she does actively try to stay in the shade as much as possible.
- Foolish Sibling, Responsible Sibling: The easygoing, irresponsible, and Book Dumb older sister to contrast her studious and reliable younger twin sister Himari.
- Friendly Neighborhood Vampire: For the most part, she doesn't look or act like a vampire other than a few quirks regarding light and heat. She's a very friendly and nice girl overall.
- The Gadfly: Oh yes. Whether it's glomping Kusakabe, looming up behind Takahashi and pretending to bite him (the sharp points he feels are not her fangs, but two pencils), or messing with Machi's body while her head is on a date, er, experiment, with Takahashi, she does enjoy being the little prankster.
- Genki Girl: Hikari is almost never seen without being hyperactive to some degree or another. From the first hours of the morning to the end of the school day, she's energetic and demanding others be the same.
- The Glomp: It's her way of greeting people and showing enthusiasm. She actually feels uncomfortable when she's not allowed to do this with people she considers friends or family.
- Glowing Eyes: Gets these in any sort of flash photography. Takahashi speculates that vampires have the same additional reflective membrane in their eyes that most wildlife with night vision has, leading to this effect.
- Hair of Gold, Heart of Gold: A young, friendly, and cheerful vampire girl with bright blonde hair.
- Hurricane of Puns: Has a habit of making constant blood-related puns one after another, much to Himari's chagrin.
- Identical Twin ID Tag: She differs from her younger twin sister Himari only in the color of eyes and hair as well as the different hairstyles.
- Ironic Name: Due to the meaning behind "Hikari" in Japanese, Hikari is a creature of darkness named "light".
- Know-Nothing Know-It-All: Hikari acts like she knows plenty about sex and romance when talking with Machi, but in reality, she has zero experience with either.
- Meaningful Name: Hikari generally means "Light" in Japanese. "Bright" would be an understatement for her personality. There's also some irony since vampires are almost always associated with darkness.
- Mukokuseki: Discussed even. She has blonde hair for some reason, likely a trait of being a vampire, which obviously stands out from the rest of her family. To make it seem like it's biologically feasible, her father dyes his hair blonde.
- Nice Girl: In droves. It's Hikari's enthusiasm and natural curiosity that brings Machi, Yuki, and Satou into Takahashi's office and counsel. She is the first to assure them that it's safe and worth it to be open to him. Due to her, Takahashi was able to approach the three other Demis with confidence.
- The Nicknamer: Usually gave them to her friends and teachers on the fly. Such as Macchi (or Macchy), Yukki, and Sakki (or Succey). But just plain "Sensei" for Takahashi.
- Non-Uniform Uniform: She wears brown socks, has a shorter skirt, doesn't button her collar, and leaves her blouse untucked.
- The Nose Knows: As a vampire, she has a sharper sense of smell than normal. It doesn't stop her from chowing down on garlic, and liver & onions; but she does get repulsed by the stench of tobacco on Takahashi after he's smoked a single cig with Ugaki.
- Not a Morning Person: Naturally, as the sun is rather unpleasant for her as a vampire.
- No Sense of Personal Space: She'll be up in people's faces without hesitation, and often hugs Kusakabe, with the added bonus of Kusakabe having a lower body temperature as well.
- Our Vampires Are Different: Hikari lacks all the stereotypical vampire traits except for the need to drink blood. Sunlight won't kill her, although it does weaken her. She has a reflection. She isn't repulsed by crosses, nor does garlic drive her away. She has enhanced senses, such as a strong sense of smell, but she isn't much different from a human otherwise.
- Polar Opposite Twins: Hikari and Himari are nothing alike whatsoever, right down to appearances. Their faces are the same, but Hikari is so expressive compared to Himari that it's almost impossible to tell.
- Shipper on Deck: She doesn't mind scheming ways for Machi to get closer with Takahashi.
- Sliding Scale of Vampire Friendliness: She definitively belongs to the friend end of the spectrum:
- Blood Requirement: While she does need blood, this is fulfilled by state-rationed blood packs, so no exogenous blood needed. (Friendly)
- Craving Type: Not discussed, but seems more animalistic than utility; she does bite on Yuki and Himari out of urges. (Friendly)
- Conversion: Does not convert. (Friendly)
- Superpowers: Slightly superhuman senses, particularly smell and night vision. (Neutral)
- Weaknesses: Intolerant, but not fatally so, to light and heat. (Towards either end of the spectrum)
- Appearance: Few differences from a muggle: her fangs are short enough to pass as Cute Little Fangs, and the pointy ears turned into triangular odango hair. (Neutral)
- Supernatural Gold Eyes: A vampire girl with golden eyes.
- Technically-Living Vampire: Hikari is a vampire born from humans, but her condition is treated similarly to a genetic disorder that makes her prone to anemia. She regularly drinks blood to sustain her biological well-being and has heightened senses, but is the same as a human otherwise.
- Theme Twin Naming: She named Hikari and her twin sister is named Himari. Their parents admit they wanted them to have similar-sounding names.
- Trademark Favorite Food: She loves Tomato Juice because it feels the most like drinking blood outside of her monthly pack. On a similar note, she loves liver and onions, because drinking blood so infrequently leaves her anemic and therefore she constantly craves iron rich foods. Finally, despite the vampiric stereotype, she's mentioned she loves garlic.
- Vampires Hate Garlic: Averted. Contrary to the popular belief about garlic driving vampires away, Hikari loves garlic because of its strong odor.
- Vegetarian Vampire: She receives blood packs on a monthly basis and does drink them, but she enjoys tomato juice and liver. She still feels the temptation to bite, though, so she often nibbles on her sister's arm to sate that urge.
- Weakened by the Light: Not to any harmful levels. She, like other vampires, is sensitive to heat in general.
- Your Normal Is Our Taboo: Whereas vamps in fiction feed for food, etc., Hikari's description makes it sound akin to a romantic or sexual act.
- Your Vampires Suck: Not that she takes it seriously. She's not harmed by crosses, and can easily eat garlic. The sun hurts, but vampires don't like heat in general. And a stake to the heart? Well, that would kill anyone!
Kyouko Machi
Kyouko Machi
A Dullahan girl. Machi is a sweet girl who falls in love with Takahashi.
- The Ace: Believe it or not, Machi is actually one of the best performing students in her own grade, being great at both athletics and academics. Headlessness may be an inconvenience to daily life, but is certainly no handicap in school.
- Animal Motifs: Teddy bear wearing a red scarf.
- Attack Its Weak Point: Not that it'll kill her, or anything like that. According to Machi, touching that weird flame thing where her head would be is very uncomfortable, akin to having her body pressed down.
- Awesomeness by Analysis: Machi is on a whole different level of variation of all the Demi girls, as her condition borders on the very fringes of science, even opening the possibility of fueling the research to understand the very fabric of the universe. She's a scientist's dream subject, so much that she even considers becoming a scientist to investigate herself.
- Bizarre Alien Biology:
- She has a totally functional neck. The problem is we never get to see it—from the outside, she's Losing Your Head, but a gastroscopy shows up completely normal. Takahashi's old friend, Souma, speculates that Machi's "neck" is actually a wormhole of sorts that connects the head and body.
- Takahashi explains to her that regular people compensate for the head-bobbing produced by the walking motion unconsciously by using their necks and that it is a part of the normal process of walking; in the case of Machi, he elaborates, she does these very same compensating motions with her arms, which functionally fill in for her lack of a physical neck by holding her head with them. This even includes the mechanics of head-tilting and environment awareness, and it's so fine-tuned that otherwise, she wouldn't even be able to walk. This, Takahashi explains, is one of the many aspects that make Machi so fascinating to study and interact with.
- In a conversation with Takahashi, Souma compares her to a dimensional door that could be utilized by other dimensionally related demis such as Yoko, Zashiko, or Kaoru. He compares the use to a game-breaking bug, that in the worst-case scenario the world itself would end. At the same time, she meets up with all of the said dimensional demis along with her friends and reality does indeed start changing as everyone present is now capable of interacting with Zashiko, her head becomes connected to her body by an actual neck, and the auras begin combining into an ominous "dead fish eye" color as noted by Kaoru.
- Boyish Short Hair: Has it out of necessity, as she has trouble holding her head if her hair is too long.
- But Not Too Foreign: Her mother is Irish while her father is Japanese.
- Cry into Chest: Having a detached head, she's able to do this to herself when crying.
- Cuddle Bug: Machi is fond of people holding her head, and is upset when her parents stop after she enters high school. Takahashi theorizes that, since Dullahans like Machi need their heads to be carried by either their body or by someone else, they naturally desire physical contact and affection.
- Damn You, Muscle Memory!: Unfortunately, Machi's body acts upon whatever she's seeing, even when miles away. One Potty Emergency causes her body to try and stand up when Machi sees a public restroom... except her body's stuck at Hikari's house.
- Expressive Hair: Somewhere between this and an Expressive Accessory, Macchi's flame frequently responds to her emotions. It shrinks away when someone makes her uncomfortable, and flares up like an explosion if she's agitated or surprised. Interestingly, it's not just artistic flair: Souma mentions that Takahashi has shared his observations of it happening and considers this behavior evidence of his theory that the physical phenomena of Macchi's neck are linked to human observation and intent.
- Hidden Buxom: To be fair, she is quite well-endowed & viewers can see that when she's taking a bath. However, in episode 9, Hikari & Yuki wonder why Machi wears a vest during hot summer weather. Machi explains that the sweat will make her undergarments show through her shirt. Machi lifts up her vest, cue watermelons.
- Huge Schoolgirl: She's pretty tall as she's about a head above her friends. As Takahashi imagines Machi with her head and body attached, she'd theoretically be rather tall, maybe about as tall as Satou.
- The Ingenue: She doesn't get any of the wordplay innuendos that occasionally get spoken, and she was oblivious to the obvious lies from Kurtz. She doesn't see anything wrong with a Teacher/Student Romance, though Takahashi could be twice her age.
- Last of Her Kind: Though not because Dullahans are dying out. Machi is simply one of only three known Dullahans in the entire world.
- Nice Girl: Machi is just pleasant to be around in general.
- Only Sane Man: Machi's behavior is the most normal out of the demi-girls, despite having the most glaring trait out of them.
- Silver Tongue: As shown in episode 11, Machi is very succinct and reassuring when giving words of kindness and praise towards Takahashi, even eliciting Yuki to unconsciously erupt in applause when she finishes talking.
- Smitten Teenage Girl: Takahashi is her first crush, so her actions around him are innocently adorable.
- Something Else Also Rises: When Takahashi calls her by her first name, the flame on her torso practically becomes a welding torch
. - Spiky Hair: Has the same hairstyle as Takahashi.
- Statuesque Stunner: She's absolutely adorable, that said, as Takahashi imagines, she'd be the tallest of the girls if her head was attached to her body.
- Super Drowning Skills: Zigzagged. She can swim just fine... as long as she isn't holding her head, seeing as she probably wouldn't be able to even tread water while holding it. She's even understandably a little afraid to put her head underwater. Machi even surmises that the old legends of Dullahan being unable to cross running water may in fact be because they didn't want to risk dropping their heads. Because if they did, they'd be screwed.
- Talking with Signs: She can write perfectly, even when her head is miles away, to communicate with whoever's with her body.
- Teacher/Student Romance: Machi has a crush on Takahashi, but he isn't aware of it.
Yuki Kusakabe
Yuki Kusakabe
A yuki-onna (snow woman). Kusakabe is initially a shy, withdrawn girl who doesn't particularly hang around people.
- Afraid of Their Own Strength: She fears her freezing ability will become so powerful, it will lethally freeze everyone and everything around her. An experiment by Takahashi proved her abilities are nowhere near that deadly and she has nothing to worry about for the moment.
- All the Other Reindeer: The other normal schoolgirls insult Kusakabe behind her back because they think that she's being full of herself. Thankfully, Hikari is able to sort it out.
- All Therapists Are Muggles: Her self-imposed social isolation was having a severe emotional impact. For this reason, Takahashi brought all the demi-girls together for a therapy session where they could share burdens humans wouldn't understand. He specifically cites Satou as the foremost authority for being a teacher, demihuman, and woman.
- Animal Motifs: Penguin.
- Closet Geek: She freakin' loves manga, especially gag and comedy manga. However, she tries hard to hide this from the others, with the only one even having the slightest idea being Satou-sensei.
- Covert Pervert:
- In episode 8/ Chapter 27, after she heard from Satou that the Josei manga Snow Love contains some mature scenes, she chuckled and said the following to herself, while publicly pretending a fly flew into her mouth:If it has dirty stuff like that, I should check it out.
- She desperately tries to suppress her laughter (anime) and blushes madly (manga) when Hikari describes Takahashi's arm as hard, thick, and hairy.
- In episode 8/ Chapter 27, after she heard from Satou that the Josei manga Snow Love contains some mature scenes, she chuckled and said the following to herself, while publicly pretending a fly flew into her mouth:
- Cry into Chest: Takahashi does this to help calm her down. That she got the opportunity made the other girls jealous.
- Empty Eyes: Kusakabe's eyes notably don't have pupils.
- Girly Run: Kusakabe runs this way in gym class, while Machi and Himari run a bit more efficiently.
- I Just Want to Be Normal: Kusakabe especially wishes she was just a normal human, rather than a demi.
- An Ice Person: She can reduce her surroundings to below freezing, cries frozen tears, and maintains no body heat.
- Leave Me Alone!: Because she's afraid of her own strength, she initially refuses to communicate with others.
- A Lizard Named "Liz": A yuki-onna whose name translates to "Snow Under-the-Sun".
- Logical Weakness: Anything that differs too much from her internal temperature, such as dry summer heat, obviously has some harmful effects on her, more so than Hikari. What's making it worse is she has far fewer sweat glands than muggles, which makes heat dissipation more difficult for her. Although she can take hot baths, she does note that she takes them shorter than average.
- Not So Above It All: Once she opens up thanks to Takahashi and the girls' efforts, she turns out to be just as nutty as everyone else.
- Oblivious to Love: She's unaware that Satake has a crush on her.
- Power Incontinence:
- Kusakabe unconsciously freezes the air around her whenever she's under heavy mental distress. She also unconsciously freezes the cold sweat from her feet, which causes the fear that she may catastrophically lose control of her powers and hurt people. Thankfully, Takahashi is able to figure out that such a thing is unlikely to happen.
- Brought up again in Episode 9 in an Anime-only segment where she goes to Takahashi to see if she can consciously invoke her cryogenic powers, rather than do so unconsciously under stress and negative emotion, such that she won't overheat so easily. Humorously, it doesn't work out quite so well.
- Shipper on Deck: She tries to help Machi get closer to Takahashi.
- Shrinking Violet: Yuki was very shy and withdrawn to the point of seeming aloof and arrogant. This perception is ultimately the real cause of her bullying. Thanks to Character Development she grows out of her shell.
- Silent Snarker: When she grows out of her withdrawal she develops into this, often snarking off the view of the cast (but not the viewers) over the wackiness of the situation.
- Supernatural Gold Eyes: A yuki-onna with amber eyes.
- Took a Level in Cheerfulness: After learning that her Power Incontinence was not horrifically dangerous, she opens up to the other girls, ultimately becoming happy and cheerful, which is lampshaded by those that didn't remember her being that cheerful.
- Visual Pun: Kusakabe emits cold vapors from her body as sweat, starting with her feet, whenever she feels nervous, which condenses into ice crystals. Yes, the resident Yuki-onna gets literal cold feet.
- Yuki-onna: She has fewer sweat glands (thus more adapted to colder climate), and, keeping in line with the yuki-onna legends' sad theme, would freeze her body fluids when under emotional stress.
Sakie Satou
Sakie Satou
A succubus. Satou is the newest teacher at the school, her field being math. Despite the stereotype, she is not a sex maniac in the slightest, and in fact very much wishes her sex appeal would just go away-not because she's prudish, mind, but she recognizes just how shallow the feelings she induces are.
- Above the Influence: Invoked. She could easily get Takahashi by appealing to his lust with little effort, but he happens to be a man she both likes and respects, which would make such an endeavor a bad choice. She strives to make him approach her out of his own volition and tries to take little steps herself, though there's very little that she can actually do about it without eliciting the lustful effect.
- Accidental Pornomancer: Does not really like the fact that she can induce lust on anyone around her.
- Alliterative Name: Her first and last names both begin with "S".
- Animal Motifs: A plain-looking teddy bear with its eyes closed.
- Attractiveness Isolation: Her relationship with Takahashi. He finds her incredibly attractive and intellectual, but wonders how much is due to her super pheromones. She worries about being too aggressive in courting him, as she wants him to love her through free will and not her powers.
- Beergasm: The third episode in the anime pays homage to Neon Genesis Evangelion with her saying Misato's Hard-Drinking Party Girl quote about beer while wearing a yellow tank-top and blue shorts.
- Blessed with Suck: Being a succubus certainly has its drawbacks. Just touching a human causes them to become instantly sexually aroused, so Satou lives far, far out in the countryside in a small cabin, completely alone. She wakes up every morning at 4 a.m. in order to have enough time to walk the several miles from her house to the train station (she has to take the earliest train to avoid as many people as possible), and at the end of the day, she takes the last train of the night (for the same reason). It's very difficult to stay awake due to having to get up so early but be unable to sleep until she gets home very late at night (as well as other reasons stated in the Erotic Dream entry below).
- Bullying a Dragon: She used Judo to stop bullies from harassing her as a teenager, and the close proximity forced said bully to make an absolute idiot of himself in front of the whole school.
- Buxom Beauty Standard: Fittin for a succubus, she has a fairly sizable chest, and men like Satake and even Takahashi can't help but stare at her buxom figure whenever it's not hidden by her baggy clothing.
- Consulting Mister Puppet: Episode 8 starts with her doing this with her teddy bear. Eventually, it turns out the teddy bear is a stand-in for Takahashi.
- Covert Pervert: Satou tends to let her imagination run wild—let's say, erotic—when it concerns Takahashi.
- Determinator: According to Kurtz, the succubi's Power Incontinence issues are serious enough that the government doesn't expect the average succubus to be reasonably productive members of the society, and a succubus as powerful as Satou is fully expected to live entirely on welfare. The fact that she earns her own living despite genuine inconveniences puts her into this trope.
- Eating the Eye Candy: She can barely contain her enthusiasm after seeing Takahashi in swim trunks.
- Erotic Dream: If Satou falls asleep, she induces these into those around her. And unlike her pornomancer abilities that only work on people who are attracted to females, it affects everyone. Because of this, succubi aren't welcome in apartments or high-concentration neighborhoods, and she is shown in the anime to live in a house where there are no other dwellings in sight.
- Forehead of Doom: Her intentional choice of unflattering hairstyle results in prominent forehead exposure. Takahashi also wills himself to keep his eyes locked on Satou's forehead whenever she shows more skin.
- The Glasses Gotta Go: Her need for corrective vision is authentic, but cannot wear contacts without increasing her allure. As if to emphasize this point, she temporarily takes her glasses off when trying to seduce Takahashi for a hug.
- Hates Being Touched: Because she can arouse people at the slightest touch, it's rather understandable that she try to shirk physical contact. However, she doesn't "hate" it per say, as she longs for both male companionship and meaningful contact.
- Hidden Buxom: She wears baggy clothes in an attempt to conceal her curves. She's so busty that doing so makes her appear above average, which still counts as a success since she's a lot bigger when relaxing in house clothes. During the Beach Episode, Satake falls out of a tree and goes unconscious after spying her in a bikini.
- Hot Teacher: She tries hard to avoid becoming one because her succubus nature might accidentally seduce her students. Despite her efforts, she has a secret fan club among male students.
- I Just Want to Be Loved: Satou-sensei is markedly lonely and her line of thought early in the series (resigned to be alone for the rest of her life at age 24) wouldn't be normal for an attractive young woman otherwise, but there's only so much that a lovesick succubus can do on that respect. Cue Takahashi-sensei... and for the first time, she's charging into the love battlefield.
- I Love You Because I Can't Control You:
- She desires to court Takahashi under the mistaken belief he's immune to her supernatural seduction. Her feelings become more sincere as she learns more of his kind personality and physique.
- After discovering he's not immune to her powers, she still finds his ability to resist and not immediately act upon the lust she induces exhilarating. From time to time she fantasizes how much of her power would it take to make him break down or submit.
- Irony: As Ugaki realizes, there's something certainly curious about a Succubus, a living embodiment of wanton lust, actually falling in love head-over-heels with a guy.
- Living Aphrodisiac: As a succubus, Satou has the natural ability to arouse people around her, even through slight physical contact. She's highly uncomfortable about it and tries to keep distance from other people because of it.
- A Lizard Named "Liz": A succubus (サキュバス, read as sa-kyu-ba-su) named Sakie. This gets discussed in Chapter 41. The similarity was a complete coincidence, and after it was discovered that she was a succubus, she was frequently teased about it as a child.
- Mark of the Supernatural: She's a succubus and has purple eyes to show she isn't normal.
- Nerd Glasses: She's inexperienced in romance, is a mathematician, and wears glasses for deliberately invoking less flattering nerdiness to limit her sexy aura.
- Nerds Are Sexy:
- She falls in love with Takahashi even more after hearing him deliver a scientific thesis on how her powers work.
- Her own intellect and constant attempts at downplaying her physical beauty also cause the trope to apply to herself.
- Nervous Wreck: To call Satou "jumpy" would be an understatement. Satou's liable to freak out at the slightest surprise.
- Paper-Thin Disguise: Invoked. She tries to appear as physically unflattering and plain as possible as to not elicit attention towards her appearance; it does work to a certain degree as long as people don't look too closely. However, people do find her to be gorgeous upon closer inspection, making her disguise somewhat iffy.
- Property of Love: Why she never pursued a romantic relationship with anyone. She is quite aware she can instantly cause men to enjoy her presence and obey her whims but does not desire a lover from Happiness in Slavery.
- Reluctant Fanservice Girl:
- While she dresses modestly to suppress her aphrodisiac effect, she's also embarrassed to show too much skin. Though she'll make an exception for Takahashi.
- In the opening, she tries to cover up a picture of herself in a seductive outfit.
- Reluctant Monster: While not to the point of I Just Want to Be Normal, she doesn't want to seduce anyone.
- Sensei-chan: She becomes this for the demi-human students.
- When asked how she refers to Satou, Hikari replies "Succey", prompting Takahashi to ask if they're best friends.
- She humorously considers Machi a secret rival for Takahashi despite the age difference between them. She's easily jealous how Machi gets more fawning attention than she does.
- She has the same interests in anime and manga as Yuki. They also share the same peculiar sense of humor in puns and innuendo.
- She Cleans Up Nicely: As a Reluctant Monster succubus, she actively tries to not clean up too much, because she knows it would graduate her from 'attractive teacher' to 'walking sexual apocalypse'. She's prepared to cautiously reconsider for Takahashi, though.
- Single-Target Sexuality: Takahashi is the only man she has romantic desire for.
- Single Woman Seeks Good Man: She picks up a crush on Takahashi after when she mistakenly believes that he isn't affected by her supernatural charm. After realizing he isn't as immune as she thought, she begins to find herself drawn to him because of his good nature and how he refrains from giving in to temptation.
- Sliding Scale of Beauty: She is between Level I (Divine) and Level II (World Class). Takahashi already considers her a 10/10 beauty, though the lustful effect she elicits is already "superhuman", to say the least. According to Ugaki, Satou is beautiful even among succubi.
- So Beautiful, It's a Curse:
- Being a succubus, she's sex appeal personified. This, unfortunately, causes a lot of problems for her because of what can happen if she loses control over her lust aura.
- Takahashi theorizes that succubi release powerful pheromones that are a source of Smells Sexy. Under this hypothesis, the artificial hormones also create a Beer Goggles effect. Ugaki points out that Satou is naturally beautiful and already a "ten" on the sexy scale. This results in her being one of the most powerful registered succubi in Japan, as it takes her up a notch in attractiveness.
- Succubi and Incubi: She's a succubus, but a prudish one, so while she's supernaturally attractive and has powers that make people lust after her, she actually resents them and tries to control them and downplay her sex appeal as much as she can.
- Succubus in Love: She falls in love with Takahashi at first because he is able to control himself despite her charm effect. After falling for his other attributes, she is more willing to use her succubus charm to win him over.
- Tarnishing Their Own Beauty: Due to being a succubus, even slightly attractive appearances make her arousing aura that much more effective. To suppress it, Satou wears a track jacket and pants and gives herself an unflattering hairdo. Even all that doesn't stop others from considering her to be pretty.
- Unknown Rival: To Machi for Takahashi. Even she admits it's very childish, considering the age gap between them and she has a tremendously unfair advantage as a succubus.
- Wham Shot: In-universe and twice in episode 9. She leaves Takahashi basically paralyzed when she removes her coat and glasses, letting her hair down; then, she unintentionally lifts up her breasts in front of him when zipping up her coat back. These go to demonstrate just how professional Takahashi is around her.
Himari Takanashi
Himari Takanashi
Hikari's human twin sister, the younger of the pair. She does a lot to put up with Hikari, which makes her helpful to Takahashi for learning more about living with demi-humans.
- The Ace: She's one of the very best students at school, ranging from first to second overall in standardized tests.
- Aw, Look! They Really Do Love Each Other: Though she is the first to raise her voice in protest to Hikari's behavior and the slack she has to pick up, there is little that Himari wouldn't do for her twin sister.
- Cloudcuckoolander's Minder: She is the first person that makes sure that Hikari does what she's supposed to do, though Hikari still manages to lag in spite of her efforts. Still, even when Himari moans and groans a lot on her twin's account, she is the first that comes to Hikari's defense if she feels that she's been wronged or hurt.
- The Cynic: Invoked. She tends to assume that the people that approach Hikari don't have the best intentions and would either harm or take advantage of her due to Hikari's Demi nature and natural kindness.
- Fiery Redhead: Inverted; despite having auburn hair (which is actually dyed to be fashionable) she's calm and coolheaded, especially compared to Hikari.
- Foolish Sibling, Responsible Sibling: The mature, hardworking, and model student younger twin sister to her older sister Hikari who is carefree and Book Dumb.
- Girlish Pigtails: Most often wears her hair in two pigtails hanging in front of her shoulders.
- Girly Run: During a dramatic scene in Episode 6.
- Identical Twin ID Tag: She differs from her older twin sister Hikari only in the color of eyes and hair as well as the different hairstyles.
- Idiot Ball: When Takahashi suggests that Hikari might need help with her hair because she doesn't have a reflection, she freaks out over her earlier rejection of her, never mind that she had seen Hikari's reflection before, which was lampshaded by Hikari herself.
- Mature Younger Sibling: Himari is levelheaded, serious-minded, and diligent, making it easy to forget that she's the carefree Hikari's younger twin sister.
- My Sister Is Off-Limits: She takes this frame of mind with Takahashi when she became suspicious of his curiosity with Hikari.
- Polar Opposite Twins: She and Hikari are nothing alike, right down to appearances. Their faces are the same, but Hikari is so expressive compared to Himari that it's almost impossible to tell.
- Security Blanket: Surprisingly, she's the blanket to Hikari, as Hikari nibbles on her to sate her vampiric biting urges.
- Theme Twin Naming: Her parents admit they named her Himari because it sounds similar to the name of her twin sister, Hikari.
- Token Human: Out of the main female cast, Himari is the only human out of them.
Side Characters
Yuusuke Satake
Yuusuke Satake
Yuki's male classmate.
- Audience Surrogate: Regarding the Girl Watching of the female cast.
- Butt-Monkey: To put it simply, the demis don't seem to notice him.
- Dogged Nice Guy: He likes Yuki a lot, though he's at his wit's end on how to approach her without sounding insensitive, making him practically out of boundaries.
- Hormone-Addled Teenager: Perversion is his defining trait.
- Jerk with a Heart of Gold: Can be insensitive and selfish, but is otherwise a nice guy.
- No Name Given: In the manga. In the anime, he was given the name Yuusuke, the first name of his voice actor.
- The One Guy: The only boy that has a recurring speaking role.
- Stating the Simple Solution: In episode 11, after much ado and spending a considerable time outside looking in, he and his friends realize that the way to approach the demis and become friends with them is to follow Takahashi's example and familiarize themselves with the "demi" aspect of Hikari, Macchi, and Yuki, and not try to ignore it like most people unwittingly do.
Ugaki
Ugaki
A detective working for the demi-human department, specifically handling succubi. He's also Satou's handler and more or less her father-figure
- Beleaguered Bureaucrat: Between being partnered up with a kid, trying to keep tabs on succubi who're unhappy with the additional surveillance, and having to deal with often ambiguous and hazy seduction incidents wherein determining the culprit is difficult, Ugaki's got it pretty tough.
- If You Thought That Was Bad...: He explains to Takahashi the precarious, extremely delicate, and poorly understood nature of succubi-related sexual crimes and how it's basically the bread and butter of his department. As a matter of fact, this is implied to be one of the reasons he took a special interest in the care of Satou and this partly explains why she's such a straight arrow in that matter.
- Large Ham: Ugaki seems to have a lot of fun approaching almost any conversation with the subtlety of a truck.
- Parental Substitute: To Satou. Satou even tells him that he was more of a father than her own.
- Shipper on Deck: Ugaki approves of Satou's infatuation with Takahashi and subtly tells him to take good care of her. He actually encourages Satou to let loose and seduce Takahashi with her powers. He justifies it morally as Satou and Takahashi are good people and would make a great couple.
Kurtz
A German boy working alongside Ugaki.
- Bad Liar: Makes a very distinctive face whenever he's lying. The anime takes this further with him speaking in a deeper, stilted voice that makes it even more obvious than it already is.
- Badass Adorable: A cute young teen that can even wrestle Ugaki.
- Bratty Half-Pint: He's a handful to work with, due to his immaturity.
- Expy: Kodansha Comics' translator's notes noted his design is basically a clone of Kitaro from GeGeGe no Kitarō, except that his hair was parted to the other side.
- Genius Ditz: He's exceptional at deducing people's emotional states and offering relationship advice.
- The Matchmaker: In a single evening he's able to bring Sakie and Takahashi closer together than they did on their own for a year.
- Oh, Crap!: The way you can tell he's lying is through his exaggerated facial expressions.
- Succubi and Incubi: Chapter 42 of the manga reveals his immunity towards the succubus' allure comes from him being an incubus, the male equivalent of a succubus, though his own alluring power is quite weak. This also explains Hikari initially mistaking him for Sakki-sensei when almost bumping into him in the hall.
Souma
Takahashi's friend from back in college. Souma works as an assistant at the Musashino University of Science. However, he's a bit of an oddball.
- Art Shift: In contrast to Takahashi, Souma has a much thinner build, and is drawn is more like a Bishounen from a 70's anime.
- Ditzy Genius: He is quite brilliant to be working in a University in Japan. However, he is, in Takahashi's words, a weirdo. Specifically, whenever he's in deep thought, he completely freezes in place and practically loses all cognition of the real world.
- Foil: To Takahashi. Souma is working in a much more prestigious position in a university and is thinner and more classically handsome, but he has a couple of screws loose in his head; while Takahashi is a high school biology teacher, more strongly built, but is also more down to Earth.
- Large Ham: Once he goes on a scientific tangent, there's no stopping him.
- Nightmare Fetishist: He breaks out laughing at his own thought that Machi could theoretically be used to end the world.
- Perpetual Smiler: The first thing Takahashi says is to point out that Souma has only one expression as always, specifically this.
Yoko Takahashi
Yoko Takahashi
A freshman at Musashino University, Tetsuo's niece, and a Spiritual Medium Demi. Due to her eyes, she's the only one able to see and knowingly interact with Zashiko.
- Children Raise You: Having to take care of Zashiko had made her more cash conscious, protective, and responsible, as noted by her friend. After thinking it through, she vows to become an enlightened adult for the younger demi.
- Perception Filter: She functions as one herself, subconsciously acting in a way that would obscure Zashiko's actions. This, in turn, presents one for her. While she believes she's simply observing or physically pointing out what Zashiko is doing, she will actually be acting in a way that would attribute those actions to herself such as holding on to a ball that would otherwise appear to be levitating or perceiving herself to be watching Zashiko sit on Tetsuo's lap when she is in fact sitting on him herself over the child's position within the physically observable dimension.
Zashiko
Zashiko
A young Zashiki-Warashi living with Yoko.
- Invisible to Normals: She exists entirely in a different dimension, similarly to a Dullahan's neck.
- Sweet Tooth: She loves sweets of all kinds and will throw a tantrum if denied them.
- Zashiki-warashi: What she is, exhibiting their ability to hide from most people and having a mischievous nature.
Kaoru Higa
Kaoru Higa
- Aura Vision: She's able to see people's auras as a colored fog and can see how they mingle as well.
- Mind Control: Subconsciously attracts fish. With the understanding that her powers are potentially beyond the normal scope for a Kijimunaa, Takahashi theorizes that she could potentially exert control over humans as well. Essentially if a yuki-onna can turn negative thoughts to cold and a succubus can control sexual thoughts, then she could potentially use the ability to read thoughts to overwrite them as well. She wants nothing to do with that.
- Power Limiter: Her shades are used to help block out the sight of people's auras and eye color changes to help avoid alienating people by knowing too much about them.
- Shipper on Deck: According to her Takahashi and Satou have a great combined aura, and that it's only a matter of time before they get together. She lets Machi know to try to avoid having the girl's heartbroken.
Spoiler Character
Invisible Girl (Shoko Hasegawa)
An unnamed demi-girl who first appears in the 13th Episode OVA. Her physical body is completely invisible, which she uses to go out and have fun.
- Canon Immigrant: The events of the OVA with her are repeated as a special bonus chapter taking place at the end of Volume 4, chapter 30.5, available on the Niconico Siega manga hosting service, after the manga won a fan competition.
- Didn't Think This Through: When she accepted Takahashi feeling her face to form a mental image of her, she certainly wasn't expecting for him to grasp her face full-handed, notwithstanding that he's a huge guy, thus, huge hands.
- If You Thought That Was Bad...: Because of the ingrained perception of communication as a mutual endeavor, Takahashi has problems grasping the possibility of talking with a person that is, for almost all senses, immaterial. As such, and aside from the fact that she is naked, Takahashi asks her to cover herself so that he can at least know where to talk to.
- Innocent Blue Eyes: When we get a peek at how she would probably look, she has noticeably blue eyes. Considering she's also an Innocent Fanservice Girl...
- Innocent Fanservice Girl: She feels no embarrassment about being naked, seeing as she's invisible anyway. Though this unnerves Takahashi because he doesn't know where to look except for her butt indent on the chair she's sitting on, and later after Takahashi discerns how she would look by feeling her face, she actually does get embarrassed.
- Invisible Streaker: Her body is completely transparent, but any clothing on her would stick out like a sore thumb. However, she has absolutely no qualms about walking around naked, saying that it seems to suit her anyway.
- Last Episode, New Character: Even beyond the last episode, since she appears in a post-anime OVA that already Overtook the Manga. She would later become a Canon Immigrant, the post-anime OVA being adapted as part of volume 4.
- Pun: At the end of her chapter, she breaks the fourth wall to ask Takahashi if they'll be seeing more of her in later chapters. He replies that he can't see that far ahead.
- Punny Name: Her given name from the manga chapter, Shoko, can also be read as "glass." Her full name, written in Japanese, is also the name of a Japanese glass company. (Hasegawa Glass.)
- See the Invisible: Done in a few ways in the manga. On the first page, a black outline shows where she's at and her general shape, but only to the viewer. Her butt-print on the chair makes it clear where she's at to Takahashi, and right afterwards he makes her put a towel on so he knows where her body is in general. However, it's not until Takahashi feels her face that we get a full on picture of what she looks like, which drives her to flee in embarrasment.
