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The female lead of the comic. An unassuming, but dangerously aggressive high-schooler with a massive crush on her classmate Yukio.
- Aloof Dark-Haired Girl: Not on purpose, she's just so preoccupied with pining after Yukio that she often doesn't even notice when other boys are trying to flirt with her.
- Beware the Quiet Ones: She doesn't seem to socialize much but you can bet she'll speak up should another girl dare talk to Yukio.
- Berserk Button: Do not flirt with her boyfriend if you in any way value your life.
- Clingy Jealous Girl: Played straight.
- Cool Big Sis: To Aiko and Airi, who often come to her for relationship advice.
- Even Evil Has Standards: Junko doesn't exactly have many reservations about killing people, but when her father suggested murdering her classmates when she was a child because they were bothering her, even Junko didn't let him do it.
- In Love with Your Carnage: She finds her boyfriend's violent possessiveness cute.
- In the Blood: If her sisters' warped view on dating and her father being a convict is any indication.
- Knife Nut: She carries a kitchen knife around with her and is more than ready to use it.
- Red Eyes, Take Warning: She has red eyes and is a complete Yandere.
- Stalker with a Crush: She's this for another Stalker with a Crush, before they confess their mutual feelings and become an Unholy Matrimony.
- Stalking Is Love: She seems to think so, and it gets her a boyfriend.
- Unholy Matrimony: The entire point of the comic. What happens when two insane stalkers fall in love with each other?
- Yandere: For another Yandere.
The male lead of the comic. A quiet boy whose hobbies include soccer and taking photos of his crush Junko.
- Berserk Button: Any male being near Junko.
- Crazy Jealous Guy: Played straight. Considering who he is this for, it was practically a match made in heaven.
- Four Eyes, Zero Soul: He wears glasses and will beat the tar out of other guys if they even look at his girlfriend.
- In Love with Your Carnage: He has no problems at all with Junko threatening him or others at knife point. He thinks it's cute.
- Moral Myopia: In episode 11 he gets furious when he notices an older man following Junko - when he was in fact doing the exact same thing and taking photos to boot.
- Red Eyes, Take Warning: His eyes are red and he's not above using violence to get his point through.
- Stalker Shrine: The walls of his apartment are completely plastered with photos of Junko.
- Stalker with a Crush: He's this for Junko before they confess their mutual feelings and become an Unholy Matrimony.
- Stalking Is Love: He seems to think so, but luckily, so does his girlfriend.
- Stronger Than They Look: Yukio easily overpowers people that seem stronger than him. Usually whenever they get too close to Junko.
- Unholy Matrimony: With Junko.
- Yandere: He's a male example in love with a traditional example.
The Ishikawa Twins
A pair of sisters who have taken on manga-personalities to set themselves apart from each other. Ironically, they both ended up falling for the same guy.
- All Girls Want Bad Boys: They fell in love with Takeshi solely because he is a delinquent and they find that hot.
- Always Identical Twins: If it weren't for their hairstyles and demeanor, it'd be impossible to tell who's who.
- Coordinated Clothes: Their school uniforms bear the others' color scheme inverted.
- Creepy Twins: Played straight.
- The Dividual: Zig-zagged. They're painfully aware of just how interchangeable they are, so they both took on certain personality traits to be at least a little bit different from one another. Despite this, they're still never seen apart, agree with each other on everything and even fall in love with the same guy.
- Finishing Each Other's Sentences: Downplayed but they're incredibly prone to finishing the others' thoughts.
- In the Blood: Their dad has been revealed to have been in jail for a long time and if this trope applies, it's not hard to guess where their more violent tendencies come from.
- Polar Opposite Twins: Airi is chipper and upbeat, Aiko is calm and collected. Somewhat subverted as they weren't like this from the very beginning but rather intentionally chose to act like they do, based on certain character archetypes they saw in a manga.
- Single-Minded Twins: Even though they look like polar opposites personality-wise, mentally they're completely in-synch with each other, as proven by their shared crush on Takeshi.
- Sadist: Their first reaction to seeing their crush beaten up and in pain is to admire how hot the injuries make him look.
- The Stoic: Aiko chose to act "quiet and cool" when they picked their personalities.
- Theme Twin Naming: Aiko and Airi.
- Trickster Twins: They show shades of this in their first appearance where hey both carry a weapon and seemingly strong-arm Takeshi into dating them both.
- Twin Threesome Fantasy: Inverted and downplayed. They both want a relationship with the same guy and see no problem with sharing him.
- Yandere: Both of them for Takeshi.
A delinquent who goes to the same school as Junko and Yukio. His life takes a turn for the worst when he decides to try his luck with Junko one day.
- Butt-Monkey: After making the fatal mistake of deciding to hit on Junko, her Crazy Jealous Guy Yandere of a boyfriend comes after him before Junko's sisters decide to force him to be their shared boyfriend. Then it gets worse for him when the twins' father comes after him for dating both of his daughters at once.
- Clueless Chick Magnet: He had no idea the twins were attracted to him before they introduced themselves.
- Failure Is the Only Option: See Scylla and Charybdis below.
- Japanese Delinquents: He has bleach-blonde hair, is seen smoking at several points in the story and has a very confrontational attitude.
- Jerkass: Well, he is a delinquent.
- Scylla and Charybdis: When Mr. Ishikawa is released from prison, one of the first things he does is kidnap poor Takeshi and swears to release him only if he stays away from his daughters. Then said daughters threaten to kill him for not talking to them. And when he finally snaps and tells them to leave him the hell alone, like their dad told him to do, they start to cry. Cue said dad appearing out o fnowhere, clearly pissed that Takeshi hurt the feelings of his daughters.
- Sir Swears-a-Lot: At least when he's angry.
A girl who puts her brother's work over everything else.
- Big Brother Worship: She admires her older brother and will literally do anything for him.
- False Friend: She befriended one of her classmates for the sole reason of luring her to her brother so he could turn her into one of his "trophies". Dialogue implies that this isn't the first time this has happened.
- Four Eyes, Zero Soul: She wears a pair of round spectacles and shows no reaction to an innocent girl being mutilated before her eyes.
- Lack of Empathy: She didn't even spare the girl whom she lured to her death a glance after her brother was done with her and ignored her tearful appeal to their former friendship.
- White Hair, Black Heart: Played straight, though a bit less so than her brother since she doesn't seem to bear the girl she lured to him any ill will. She just doesn't care what happens to her.
Hana's Big Brother
A doctor of some sorts whose "work" somehow encompasses turning young girls into "trophies".
- Hate Sink: Of all the characters that appeared until now, he's the least sympathetic so far. He sends his sister to befriend school girls and lure them to him so he can cut them up and presumably kill them, for no apparent reason other than for his personal enjoyment. Then there's the fact that he seems to have his eyes on Junko...
- Mad Doctor: He appears to be one with his white lab coat and his obsession with trophies.
- White Hair, Black Heart: He has very light hair and delights in cutting up young girls he told his sister to bring to him.
The mother of Junko, Aiko and Airi. A woman with a much more pleasant attitude than her daughters.
- Beware the Nice Ones: At first glance she may look a lot nicer and mentally stable than her children. But episode 30 has her happily remarking that Junko's dad is going to come home from prison, while sporting a rather disturbing smile.
- Dissonant Serenity: Has no visible reaction apart from mild amusement to Junko coming at her with a kitchen knife. Perhaps not that surprising to her, considering who Junko's father is.
The father of Junko, Aiko and Airi, who spent the majority of Junko's childhood in prison.
- Daddy Had a Good Reason for Abandoning You: "Good" might be overselling it here, but his absence hasn't exactly been voluntary.
- The Dreaded: As he's being released from his cell, the guard seems absolutely terrified of him.
Guard: "Please don't hurt me..."
- Disappeared Dad: Justified. He's been absent from his kids' lives because he's been in jail.
- Even Evil Has Loved Ones: He's introduced looking at a scrapbook of his daughters growing up, showing that he loves his family very much through it all. In fact, he was placed in prison for avenging his daughter by murdering her bullies' parents.
- Knight Templar Parent: He casually offers to murder Junko's classmates because they've been bothering her. He decides to murder her bullies' parents instead for allowing them to get away with it.
- Notorious Parent: He's been absent from his children's lives because he's been in prison.
- Overprotective Dad: He threatens Takeshi to stop dating his daughters, much to their displeasure. When they complain about how he won't let them have a boyfriend when Junko has one, his response implies he intents to deal with Yukio in a similar way.
- Papa Wolf: Hurting Junko is a great way to invite her father to murder your whole family. And dating both of his younger twin daughters will definitely not get you on his good side either, as Takeshi found out the hard way.
- Revenge by Proxy: Since Junko tells him that hurting a child is going too far, he murders Junko's bullies' parents instead to avenge her.
- Would Hurt a Child:
- Wouldn't Hurt a Child: Although he would certainly like to, Junko tells him that even she thinks that's going too far. So he murders the parents of Junko's bullies instead.