Characters / Kiznaiver

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WARNING: Based on how the work is choreographed, various tropes here contain major plot spoilers!

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Kiznaivers

As a Group

• All Love Is Unrequited: Yuta is in love with Maki, who is in love with Ruru. Meanwhile, Katsuhira and Sonozaki are ambiguously in love with each other, while Chidori is in love with Katsuhira, Tenga is in love with Chidori and Nico is in love with Tenga.
• Always in Class One: All of them are in class 2-A.
• Breaking the Fellowship: Episode 10 reveals that they decided to separate themselves to avoid further pain and the possibility to read each other thoughts.
• Color-Coded Characters:
  • Katsuhira - White
  • Chidori - Magenta
  • Tenga - Yellow
  • Nico - Orange
  • Yuta - Teal
  • Honoka - Brown
  • Hisomu - Purple
• Color-Coded for Your Convenience: The physical pain is expressed by a blue color, emotional pain through yellow light and thoughts shared are shown through a red light.
• Fire-Forged Friends: Sonozaki's mission really brings them closer together in the end. By episode 11, it's revealed and lampshaded that they have become True Companions.
• Heroic BSoD: Though Maki goes through one alone during episode 6 and 7, episode 9 ends with them all sharing the emotional pain of their fear of not being able to be friends and the pain of no one getting their feelings returned.
• Love Dodecahedron: Nico is in love with Tenga, who is in love with Chidori, who is in love with Katsuhira, who has a strange situation going on with Sonozaki. Yuta is interested in Maki, who is still dealing with her feelings for Ruru. Hisomu though, is completely out of this situation.
• Invisible Parents: None of their parents are ever seen, if they even have parents. Nico mentions her father is a doctor and her family is rich, Katsuhira's parents work overseas and send him money, and Tenga claims his parents don't care where he is. The other four families are never mentioned, although Honoka appears to live in a normal middle-class house.
• Oblivious to Love: Outside of Nico, all of them seem to be this.
• Odd Friendship: A group composed by people who would never hang out or interact in any other situation, obviously, their friendship would be considered weird for an outsider. This even gets lampshaded by Yuta's admirers when they see him with Tenga.
• The Power of Friendship: Invoked by Katsuhira and Urushibara in episode 11: the Kiznaivers all feel Katsuhira's emotional pain, even without the Kizuna System, meaning that the pain they felt from watching Katsuhira suffering came fully from how close they have become and their own empathy towards him.
• Putting the Band Back Together: Nico still wants everybody to be friends, and Katsuhira and Hisomu seem to want it too, so she plans to do it. It's implied that all of them actually want this too. Katsuhira seems to pull this off in episode 11, by putting his heart out and stating that they were already friends during the summer.
• Ragtag Bunch of Misfits: They seem to be really lonely before being forced together by the Kizuna System, not really fitting anywhere. Even Yuta's admirers might not be really friends to him as much as ego boosters.
• Seven Deadly Sins: Sonozaki creates new sins to identify them:
  • Katsuhira - The Imbecile
  • Chidori - The Annoyingly Self-Righteous
  • Tenga - The Musclehead Thug
  • Nico - The Eccentric Headcase
  • Yuta - The Cunning Normal
  • Honoka - The High and Mighty
  • Hisomu - The Immoral
• Synchronization: They share their physical pain through the Kizuna System. After episode 5, they share emotional pain and as of episode 9, they share their thoughts.
• True Companions: While they were off to a rocky start, Nico particularly is working towards making the group this. After episode 9, it's not working. However, in episode 11, Katsuhira talks about how much he wants them to be friends again and that they were already friends during the Kizuna experiments by the fact they trusted each other in dangerous situations.

Katsuhira Agata

Voiced by: Yūki Kaji (Japanese), Rylan Strachan (English)

The Imbecile

An apathetic second-year high school student that is unable to feel pain. He becomes a Kiznaiver along with six of his classmates.

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• Affectionate Nickname: Chidori calls him "Kacchon".
• All Men Are Perverts: Zigzagged. Compared to Tenga, who has shades of a Lovable Sex Maniac, Yuta, who is the Casanova, and their teacher, Kazunao Yamada, who plays dating sims in the middle of the class, Katsuhira comes off as asexual due to his lack of interest in a girl who openly likes him. However, he thinks Sonozaki's Smells Sexy, notices the pattern of her panties while falling down the stairs, and later attempts to look for Sonozaki by identifying the panties of passing girls while watching from a floor below.
• All of the Other Reindeer: He was bullied since childhood due to his inability to feel pain and lack of emotion.
• Always Save the Girl: Zigzagged. He saves Sonozaki in episode 8, but before that, he gets saved by Chidori in episode 2 and when both him and Sonozaki are drowning, she is the one that saves him.
• Betty and Veronica: Archie to Chidori's Betty and Sonozaki's Veronica.
• Character Tics: Tugs on his fringe when he's talking sometimes.
• Childhood Friends: With Chidori. It's also heavily implied that he and Sonozaki knew each other when they were kids which is later confirmed to be true with the reveal that both he and Sonozaki were first-generation Kiznaivers from an early version of the Kizna Project.
• Color Motif: His theme color is white.
• Deadpan Snarker: Surprisingly, though he's heavier on the deadpan than on the snarker.
  Tenga: Living together just seemed the logical choice, don't you think?
  Katsuhira: I don't think I've ever met someone more unfit to use the word "logical."
• Disappointed in You: In episode 6, he tells this to Sonozaki for her manipulations over Honoka. Considering who he is, it is startlingly effective.
• Dogged Nice Guy: Zigzagged. He noticeably acts more social and outgoing whenever Sonozaki is involved, but he still keeps his stoic demeanor. That being said, he isn't afraid of calling her out when she singles out Maki for a mission.
• Dull Surprise: How he responds to pretty much everything. Even when he's being used as a punching bag by bullies, he just takes it with a blank look on his face.
• Easily Forgiven: Subverted; Tenga states that he cannot forgive him quite yet, but refuses to not help him when he is in need.
• Emotionless Boy: He shows very muted emotional responses to the events around him. Not even being pushed down a flight of stairs gets much reaction from him. According to Chidori, he wasn't always like this.
• Extreme Doormat: He does everything his bullies and Sonozaki tell him to do, even when it's clear how awful it would be to him. Both Chidori and Sonozaki lampshade that behaviour.
• Feels No Pain: Katsuhira lost his ability to feel pain in an incident in his childhood. In his particular case, he still can't feel the pain inflicted on him, and he only starts to feel a tiny bit of the pain shared through the Kizuna System.
• First-Name Basis: How the majority of the cast addresses him. In Episode 7, the others are surprised to learn that Katsuhira is his given name.
• Grew a Spine: In Episode 5, he starts showing a backbone when he demands that Kamaishi return the money that was taken from him as it has caused Chidori pain. This continues into the next episode, when he outright tells Sonozaki that he doesn't approve of the methods she's taking.
• Innocently Insensitive: Deconstructed. Since he believes worrying about him would be a bother, Katsuhira offers to forget Chidori's confession ever happened. However, this comes across as insensitive to Chidori, annoying her. In episode 8, he ditches Chidori while she's confessing to look for Sonozaki. Granted, Sonozaki would have died if he hadn't but still. But possibly the worst in episode 9 when he hears Chidori's thoughts about wanting him to hold her like how he held Sonozaki a few scenes prior, he embraces her, but Chidori knows that it doesn't hold the same meaning; Katsuhira doesn't understand this, thinking that she only meant it literally. Needs to learn tact, indeed.
• Iron Butt Monkey: Black Comedy style. Due to his inability to feel pain, Katsuhira is the only person ^note minus Hisomu willing to endure, and perform the most dangerous pain infliction without batting an eye, nor facial reactions; like being hit by a car. While this is terrifying for the rest of the Kiznaivers (and in real-life, to be honest), it is hell of an amusing experience for the audience... and probably for himself as well.
  Katsuhira: I'm fine... I think it's just... a slight concussion... *Blacks out*
  Tenga: You're not fine at all!
• Locked into Strangeness: Katsuhira initially had brown hair, but a certain incident turned his hair white. The lower back and the top of his hair are still brown though. Urushibara reveals to him that this was a side effect from Katsuhira's previous Kiznaiver experiment where most of his emotions and senses were transferred to Sonozaki and never went back to him, causing his hair to prematurely grey.
• Major Injury Underreaction: Due to his inability to feel pain.
• Manly Tears: In episode 9, and again in episode 10, after meeting the old Kiznaivers in the worst situation.
• My God, What Have I Done?: Has this in episode 9, after realizing that what triggered the chain of awful feelings of rejection and Unrequited Love between the Kiznaivers was his inability and unwillingness to properly deal with Chidori's feelings for him, as well as being oblivious to the tangled Love Dodecahedron between the Kiznaivers.
• Not So Stoic: As part of his character development, he starts developing emotions and showing them, smiling and crying becoming things he is able to do.
• Oblivious to Love: Was unaware of Chidori's crush on him when they were younger and admits to never even considering the idea. After she tells him about it, he starts blatantly ignoring her feelings.
• Odd Friendship: With Hisomu, later in the series.
• Official Couple: With Noriko.
• Older Than They Look: Downplayed, but he's the shortest of the males and is the second oldest.
• Personality Blood Types: Type A.
• Red Oni, Blue Oni: Blue oni to all Kiznaivers, most particularly to Hisomu, Chidori and Tenga.
• Skyward Scream: At the end of Episode 10.
• Smells Sexy: Sonozaki asks if the smell of a girl excites Katsuhira, but it's subverted as Katsuhira only seems to be amazed by the fact that this was the closest he's ever been to anyone. The whole scene is full of Ship Tease.
• Staircase Tumble: Sonozaki pushes Katsuhira down the stairs in their meeting.
• Sugar-and-Ice Personality: He's undeniably stoic and never raises his voice, but after coming to the conclusion that Noriko might be his Childhood Friend, he starts acting nice towards her.
• Used to Be More Social: According to Chidori, he used to smile and laugh more as a child.
• Visual Pun: When Chidori confesses her secret to Katsuhira, the sun rises and immediately hits him. In other words, the truth finally dawns on him.
• When He Smiles: Tenga notices that he's wearing a smirk on his face after he gets Noriko's email address. In episode 7 he actually smiles, and it's beautiful.
• What the Hell, Hero?: Pulls this off on Sonozaki at the end of Episode 6.

Chidori Takashiro

Voiced by: Yuka Terasaki (Japanese), Caitlynne Medrek (English)

The Annoyingly Self-Righteous

Chidori is a member of class 2-A and Katsuhira's childhood friend. She can be nosy at times, but means well. Her Kiznaiver code number is 5.

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• A-Cup Angst: Takashiro has a little. When Sonozaki asks them to look deep within their chests ^note Means "Deep within your heart" in Japanese, but the kanji for "heart" is actually "chest.", Tenga points out that it would be hard for her to look with such small boobs, which makes her understandably unhappy. She seems to be insecure about her size after seeing Sonozaki's sizeable bust.
• Affectionate Nickname: Calls Katsuhira "Kacchon."
• Anguished Declaration of Love: Chidori confesses her love for Katsuhira in the second episode, or at least for who he used to be.
• Betty and Veronica: Betty to Sonozaki's Veronica and Katsuhira's Archie.
• Blue with Shock: Happens when she thinks Hisomu might be getting bullied.
• Childhood Friends: With Katsuhira.
• Clingy Jealous Girl: Downplayed, but she obviously is not pleased to know that Sonozaki calls Katsuhira by his first name, and she's really not pleased when she sees Katsuhira carrying Sonozaki's luggage.
  Tenga: You look ready to kill someone.
• Color Motif: Her theme color is magenta.
• Curtains Match the Window: Has red hair and eyes.
• Dark Secret: She was in love with Katsuhira in the past.
• Fiery Redhead: Downplayed. While she's calm most of the time, when she hears Katsuhira's self-introduction, her immediate response is to jump down onto the very unstable platform he's on to give him a What the Hell, Hero? speech. And then they fall. Then she starts slapping him repeatedly.
• Foil: To Nico, as of episode 10. While they are both dealing with rejection, Chidori isolates herself from the group and refuses further interaction, even with Katsuhira or Tenga. She even refuses to properly turn Tenga down because she can't understand how that would help either of them and to even get a proper turn down from Katsuhira. Nico on the other hand is more than willing to put her feelings aside if it means they can all be friends again, and prefers to face rejection upfront rather than remain uncertain if her feelings are returned or not.
• Girl Next Door: She is Katsuhira's neighbour.
• Girly Run: Runs this way briefly in the OP.
• Ignored Confession: Her confession in episode 8 goes unnoticed by Katsuhira, who tunes her out to go and save Sonozaki from a falling statue.
• Informed Flaw: For someone that is supposedly a goody two shoes, she really only focuses on helping Katsuhira from himself, and the perfectly reasonable demand that their teacher do his damn job and stop the bullying.
• It's All About Me: Has shown signs of this after being technically rejected by Katsuhira by having her feelings ignored, completely focusing on her unrequited love and not considering Katsuhira's own struggle despite being childhood friends. She also seems to believe that Tenga asking her to 'properly reject him' is done with the purpose of making her feel better, instead of the closure he properly needs for his own feelings.
  Chidori: I wouldn't understand, even if our pain or feelings were connected. Because, after all... that feeling isn't mine!
• I Want My Beloved to Be Happy: She decides to let Katsuhira date Noriko in the end, though she still has a crush on him.
• Love Hurts: So far her crush on Katsuhira has caused her a lot of heartache. First his change in personality made her extremely confused and desperate to help him out, even blaming herself for being so useless. It gets worse when they become Kiznaivers as Katsuhira's curiosity in Sonozaki looks like a crush to Chidori causing lot of pain to the point that the other Kiznaivers that were synced up to her emotional pain, admit they would rather take physical pain.
• My God, What Have I Done?: Has this after Katsuhira talks with her, seemingly his way to properly turn her down, but still wanting to be friends. After breaking down crying, she realizes that she has been making Tenga go through the same pain she went through, but not even giving him emotional closure or the chance of properly being turned down.
• New Old Flame: Katsuhira. She mentions being in love with him in the past, but now she seems to be in love with him again.
• Nice Girl: Is the nicest and most approachable of the Kiznaivers.
• Oblivious to Love: Has no idea Tenga is crushing on her. She eventually has a Jerkass Realization over this; after being rejected by Katsuhira, who wanted to be Just Friends with her, she realizes she was making Tenga go through the same situation yet not giving him the chance of being properly turned down or closure over his unrequited crush.
• Only Sane Woman: She has the most normal personality out of the Kiznaivers.
• Patient Childhood Love Interest: A deconstructed version. Because of Katsuhira's change in personality, she started to fall out of love with him but remained his friend, desperate to bring back the boy she loved. But when it looks like Katsuhira is falling for Sonozaki, she takes it hard.
• Personality Blood Types: Type O.
• Second Love: This is implied to be how she later sees Tenga in the final episode. His smile in response to this doesn't help to disprove the sentiment at all.
• Single Woman Seeks Good Man: This is implied in the final episode to be the outlook Chidori ends up taking toward Tenga. His smile in response doesn't help to disprove the sentiment at all.
• Soapbox Sadie: Her sin is "The Annoyingly Self-Righteous". She is a genuinely good person who wants to help Katsuhira from himself, but tends to be self-absorbed and ignorant of how her own actions actually affect others.
• Supreme Chef: She is a great cook and is able to put together a big and delicious meal to the group during camp.
• Tsundere: The Sweet type. She is a normal Nice Girl most of the time, with her more violent side coming up only occasionally around Katsuhira (often when he doesn't treat himself with care or when he's around Sonozaki) or Tenga (when he's being himself or when he manages to see through her, like in Episode 4).
• Unlucky Childhood Friend: Chidori used to have a crush on Katsuhira, when he was kind and actually showed emotion. Unfortunately, Katsuhira has now lost touch with his emotions and admits that he didn't even consider how Chidori felt about him.
• What the Hell, Hero?: Gets called out by Nico several times in episode 9 in regards to the fact that she is so caught up in trying to get Katsuhira she doesn't realize she is doing the same thing to Tenga. She also gets called out for her fear of getting dumped.
  Nico: You don't want to get rejected? That's not fair. Tenga-kun will yell at those two. He'll probably stop them... so you can just stay right here and not do anything!

Hajime Tenga

Voiced by: Tomoaki Maeno (Japanese), Lucas Gilbertson (English)

The Musclehead Thug

"Hip... SUMMER!"

Tenga is a loud, hotblooded member of class 2-A. He saves Katsuhira from a couple of bullies, but is bewildered by Katsuhira's nonchalant acceptance of his situation. His Kiznaiver code number is 2.

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• Anguished Declaration of Love: Screams his feelings for Chidori while beating Katsuhira, while his thoughts are wondering why she doesn't choose him.
  Tenga*In thought*: Why, Chidori? Why do you like Katsuhira more than me?
• Ass Kicks You: Tenga shoves his ass onto a bully and sits on him until he passes out.
• Big Brother Instinct: Develops this towards Katsuhira, even deciding to live with him to guarantee that he learns to look after himself and protect him from getting hurt.
• Blood Knight: His reaction to a strager getting shaken down is to grin and chuckle because he knows that means he has an excuse for a fight.
• Break Her Heart to Save Her: Invokes this in episode 10, believing that it's better to properly turn someone down than to leave everything to hurt more.
• Bully Hunter: His self-introduction implies that he confronts people like Katsuhira's bullies on a regular basis.
• Butt-Monkey: Life is just not kind to Tenga at all.
• Color Motif: His theme color is yellow.
• Dark Secret: The "Mad Dog" Tenga is actually terrified of dogs.
• Declaration of Protection: Towards Katsuhira, partly due to promising to protect him from bullies the day before, and partly because their wounds are now connected.
• The Dreaded: Katsuhira's bullies recognize him with fear, grovel at his feet and flee the scene in terror, not even trying to fight back after his initial attack on each of them despite them being more shocked than hurt.
• Dynamic Entry: How he saves Katsuhira from bullies in Episode 1 — first he throws his own backpack at one of the bullies, then performs a hip-check and sits on the bully's face until he passes out.
• Establishing Character Moment: His Dynamic Entry in episode 1.
• Fiery Redhead: His hair is closer to pink than red, but he fits this trope very well otherwise. Tenga is loud, passionate, and physically strong enough to trounce the bullies picking on Katsuhira.
• Fun T-Shirt: A diamond showcasing a bear with an exclamation mark in it; basically the shirt shouts, "Angry Bear Approaching!"
• Gratuitous English: The name of Tenga's Ass Kicks You attack.
  Tenga: Hip... SUMMER!
• Hidden Depths: He has a way more mellow side than he lets on and offers to help play The Matchmaker with Chidori and Katsuhira.
• Hot-Blooded: Almost everything that he says is at a yell and he's very easily excitable.
• Hypocrite: After ordering Katsuhira to go after Chidori, whose feelings he hurt accidentally, he refuses to go after Nico who is in a similar situation that he himself triggers and goes after Chidori, even after Maki and Yuta call him out on it.
• Ironic Nickname: His nickname Mad Dog may seem appropriate for his hotblooded nature, but he's actually terrified of dogs.
• I Want My Beloved to Be Happy: Strongly implied to be the reason why he continues to support Chidori's romantic pursuit of Katsuhira even when he starts to fall in love with her. He's even willing to beat Katsuhira to a bloody pulp when his ignorance results in her suffering a mental breakdown felt by everyone.
• Large Ham: He's pretty expressive. Best shown in his extended self-intro in episode 2, where each sentence gets its own unique pose.
  Tenga: My birthday's September 18th, and I'm a Virgo! My blood type is O! My hobbies are fishing for crawfish and raking guys who are twisted over the coals! How's THAT?!
  Sonozaki: *activates shocker*
• Lovable Sex Maniac: He almost gropes Nico mere minutes after meeting her, and makes comments on Chidori's bust size.
• Love Hurts: He is so mad that Katsuhira is hurting Chidori, even unintentionally, that he beats him senseless, not even caring about the pain he is causing to the other Kiznaivers.
• The Matchmaker: Offers to help out Chidori with Katsuhira. However, he's revealed to have developed a crush on Chidori herself in episode 8.
• Nominal Hero: When saving Katsuhira, he offers to force the bullies to pay him back... for 20% of the cut. On the one hand, he already had the bullies defeated in the palm of his hand and could have demanded them to return the money for free, especially since he wanted an excuse to fight the bullies anyway. On the other hand, 20% is a pretty small price to get back 80% of everything stolen over weeks or months.
• Nice Guy: Strangely enough, he is very nice to Katsuhira after they meet, and even says he doesn't really have to pay him. He also offers to become The Matchmaker for Chidori and Katsuhira.
• No-Holds-Barred Beatdown: Gives one to Katsuhira in episode 9.
• Non-Uniform Uniform: Doesn't wear a dress shirt or tie.
• Oblivious to Love: Has no idea Nico is crushing on him.
• Personality Blood Types: Type O.
• Pretty Freeloader: He stays at Katsuhira's apartment after they bond, but he isn't very helpful with chores. He DOES however make sure Katsuhira doesn't get beaten up, which is his reason for staying there.
• Real Men Wear Pink: His casual clothes lean toward ostentatiously decorative or just plain pink.
• Red Baron: His neighbors gave him the name "Mad Dog" for his offensive behavior. Although he's actually terrified of dogs.
• Romantic Wingman: To Chidori, during the trip.
• Rugged Scar: On the upper-right corner of his forehead.
• Shipper on Deck: For Katsuhira and Chidori in a very playful way, reacting ecstatically to them being next-door neighbors. Later moves on to The Matchmaker to help her. This is brutally, heartwrenchingly deconstructed in episode 9. He slowly began to develop feelings for Chidori after offering to be The Matchmaker, and it's heavily implied that he kept up the illusion of supporting her efforts to win over Katsuhira because he simply wanted to make both of his friends happy.
• That Came Out Wrong: Because he's the type of guy who leaps before he thinks, some of the stuff he says can be very misleading.
  Tenga: Huh? Th-then... Your body belongs to us!
  Maki: That's not any better.
• Throw the Book at Them: In his first scene, he precedes his flying hip-check by throwing his school bag at a bully's face with the velocity and accuracy of a fastball.
• Tsundere: The sweet type, and only during episode 11, for Katsuhira. He states that he does not want to see him again and is still angry, but after Katsuhira passes out, he is one of the first to get to him, worried and screaming his name.
• Why Did It Have to Be Snakes?: Tenga, whose nickname is "Mad Dog", is afraid of dogs.
• Would Hit a Girl: He does not consider Sonozaki a girl, as revealed in episode 9, calling her "the enemy" and not being even a little bit bothered with the idea of beating her up.
• Would Not Hit a Girl: That being said, when Chidori asks him to hit her to help look for Hisomu, he clearly hesitates and looks uncomfortable with the idea.

Nico Niyama

Voiced by: Misaki Kuno (Japanese), Katrina Salisbury (English)

The Eccentric Headcase

Nico is a bubbly and eccentric member of class 2-A. She seems to believe in fairies but not really.

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• Alliterative Name: Nico Niyama. It also counts as a Repetitive Name.
• Anguished Declaration of Love: In her thoughts, she asks Chidori to give her Tenga, since she doesn't love him.
• Becoming the Mask: It's implied that after Nico created her Cloudcuckoolander personality she eventually became the Cloudcuckoolander she is today. Even when her Dark Secret is revealed, she still is very odd and ditzy.
• Better as Friends: Episode 10 shows that she wants everybody to be friends, even if it means her feelings won't be returned.
• Big-Breast Pride: In the bath she compares her chest to Chidori and Sonozaki, and is pleased to be biggest.
• Blackmail: She convinces Yuta to help them by showing that she has the picture of him when he was a chubby kid.
• Blush Stickers: Has them from time to time.
• Broken Ace: The reason why she pretends to believe in fairies is that she doesn't want to be ostracized for being too perfect.
• Clingy Jealous Girl: Nico seems to be taking Tenga's efforts as The Matchmaker as signs that he has a crush on Chidori and noticeably looks very displeased as a result. And when it turns out that he does have a crush on her... This is later subverted when she becomes the first member of the Love Dodecahedron to accept the unrequited nature of her feelings and, despite wanting to keep Tenga for herself as her thoughts reveal, she chooses not to act upon it and ignores her feelings for friendship's sake.
• Cloudcuckoolander: Nico has a very odd thinking process. She believes in fairies and will participate in strange rituals to summon them. Subverted: it turns out she doesn't actually believe in fairies and just says that she does in order to seem eccentric. Then again, she's pretty odd even without the whole believing-in-fairies thing.
• Color Motif: Her theme color is orange.
• Costume Porn: She accessorizes her pigtails with odd fur-puff monster hair bands with ribbons, hearts, and whatever those kinds of balls sticking out of her hair are; which is very much in-line with Kyary Pamyu Pamyu's fashion sense.
• Dark Secret: She doesn't really believe in fairies and isn't as crazy as she makes herself seem. She only says she does to make herself seem less perfect and to make herself seem more normal.
• Everyone Can See It: When the target of Nico's crush is revealed, other members of the group comment that it was obvious.
• Fashionable Asymmetry: Even her hair!
• Foil: While it is shown from the start the differences between sensible, down-to-earth Chidori and eccentric, strange Nico, some scenes, particularly in Episode 9, highlight deeper differences between them. Both girls are facing the pain of unrequited feelings; however, while Nico accepts that Tenga does not feel the same way about her and goes out of her way to face rejection, Chidori refuses to face her fears or acknowledge the rejection she indirectly suffers. Likewise, on Episode 10 it's how Nico chose to prioritize friendship above her feelings as a way to heal, while Chidori's way to heal was to isolate herself from all her friends in order to deal with her feelings.
• Friendly Rival: To Chidori, in the end, she is willing to compete with Chidori over who gets Tenga, but she will put their friendship over everything else, meaning that no matter the results, she won't hold it against anyone.
• Genki Girl: She's very energetic and cheerful. The following exchange was her first scene in the series:
  Chidori: Niyama-san, what's wrong?
  Nico: Nico is looking for Zantoman.
  Chidori: Zantoman?
  Nico: Yeah! It's the fairy of sleep. When it throws sand at you, the sand gets into your eyes, and it's like "ow, ow, ow!" and you fall asleep, and dream, and lots of marbles fall from the sky!
• Girlish Pigtails: Despite being the same age as the other Kiznaivers, Nico is the most immature in personality.
• Hammerspace Hair: She stores palm fulls of candy within her two pigtails!
• The Heart: Is the most emotional member of the cast and is working really hard to try to get everybody to be friends. At the end, she succeeded.
• I Just Want to Have Friends: She cries when Honoka points out they're not really friends, and colleagues at best. When others state that they want or consider Nico as a friend, her eyes basically start sparkling.
• I Want My Beloved to Be Happy: Non-romantic example: she ships Katsuhira and Noriko because she wants Katsuhira, her friend, to be with the girl he likes. Bonus point due to the fact she feels no sympathy for Noriko, but if she is what her friend wants, she will support him all the way.
• Lonely Rich Kid: One of her reasons in building up her eccentric personality, as she wants people to perceive her as an average middle-class girl; she also reveals that her father runs a hospital.
• Love Hurts: She recognizes this better than the other members of the cast and is aware that she'll get hurt if she confesses to Tenga, but is willing to do it anyway. When her feelings get out, she runs away to cry alone in the gymnasium, and comes back to face them and remind them of the friendship they forged, only to have her secret thoughts read, where she admits that if this keeps going their friendship will fall apart.
• Non-Uniform Uniform: Wears a belt of beads and her skirt has extra frills underneath.
• Obfuscating Stupidity: See Smarter Than You Look.
• Oblivious to Love: Averted. She is completely aware of the Love Dodecahedron between the Kiznaivers and that her crush on Tenga is unrequited.
• Odd Friendship: In episode 4, she and Hisomu seem to be connecting.
• Older Than They Look: She's actually the oldest despite her appearance.
• Only Sane Woman: Despite her odd looks and Cloudcuckoolander tendencies, she is the most emotionally and psychologically stable character. She is also the first one to be willing to put everything on the line to help her friends, even if it means making everybody forget their petty fights.
• Personality Blood Types: Type B.
• Pint-Sized Powerhouse: She One Hit KOs Yoshizawa. The last one to do that was Tenga, the muscle of the group, and he took a longer while.
• Repetitive Name: Her name is Nico Niyama. Also doubles as an Alliterative Name.
• Shipper on Deck: After episode 10, she becomes one for Katsuhira and Noriko.
• Smarter Than You Look: Invoked. She outright says in the first episode that she is really smart but acts eccentric in order not to alienate herself from her peers. Her plan to find the seventh Kiznaiver is the one which makes the most sense: hit Katsuhira lightly and see who reacts to it. Makes more sense than going around asking the students of their class.
  • Episode 5 shows she is starting to notice Chidori's feelings.
  • Episodes 8 and 9 show that she's already caught up to the Love Dodecahedron and the fact that nobody gets their feelings returned.
• Tall Poppy Syndrome: She believes that she would be subject to it for being cute and rich, so she creates the whole fairy madness so people would think she wasn't so above it all.
• Third-Person Person: Refers to herself as Nico.
• What the Hell, Hero?:
  • She calls Chidori out several times in episode 9 in regards to the fact that she is so caught up in trying to get Katsuhira she doesn't realize she is doing the same thing to Tenga. She also calls her out for her fear of getting dumped.
    Nico: You don’t want to get rejected? That’s not fair. Tenga-kun will yell at those two. He’ll probably stop them... so you can just stay right here and not do anything!
  • She does it again to Maki in the final episode, when she does not see the point in saving Sonozaki or helping Katsuhira, going as far as to state she thought to have already got ridden of them in the first place. Goes as far as to hit headbutt her forehead.

Tsuguhito Yuta

Voiced by: Nobunaga Shimazaki (Japanese), Scott Roberts (English)

The Cunning Normal

Also a member of class 2-A, Tsuguhito is an honors student and a hit with the ladies.

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• Bishie Sparkles: Sports these in episode 2, when he pretends to be sympathetic toward Katsuhira.
• Butt-Monkey: Alongside Tenga, a lot of antics revolve around his misery and misfortune when he's around the other Kiznaivers, such as Tenga beating the crap out of him to locate Hisomu.
• Casanova Wannabe: Spends the first episode with two girls all over him, but whatever his game might be, it clearly does not work on Maki. Taken even further when he reveals he is virgin, or rather a subversion of the casanova due to not being interested in the sex part.
• Chick Magnet
• Chivalrous Pervert: While he's a casanova, episode 5 reveals he does not want one night stands but prefers normal dating, even refusing Maki's offer to have sex with him. And the reveal that he's a virgin.
• Color Motif: His theme color is teal.
• The Cynic: Shows himself to have this mentality by episode 4, continuing to distrust Hisomu's belated showing as a Kiznaiver as well as the 'why' of Sonozaki's starting to hang out with them as they head for the summer training camp. He also drops his flirty demeanor with the girls who find him cute with the understanding that he's gotten wrapped up in something big.
• Dark Secret: He used to be very overweight until the end of middle school.
• Does Not Like Men: His interactions with Tenga implies it. He also seems to care for Katsuhira just to appeal to the girls of the group, and after seeing that Hisomu is prettier than him, he points out that he hates that kind of guy.
• Everyone Has Standards: Though he can be cold in his own right, Yuta isn't exactly fond of Maki's personality, especially after she makes Nico cry. And in episode 5, even with Maki throwing herself at him, he decides to not have sex with her, seemingly not wanting a one-night stand and realizing she is not in a good mental state at that moment.
• Formerly Fat: He was a chubby kid during his childhood and didn't get the weight off until the end of middle school; much to his embarrassment.
• Girly Run
• Handsome Lech: Yuta is introduced hitting on girls, then hitting on Maki and being brushed off by her. He's shown to hold a complex over his (and others') beauty and a prettier guy taking the attention, and when Hisomu inevitably does, he can barely force a smile on his face when the girls turn their attention back to him.
• Irony: He's the character most associated with vanity, and the one most likely to lapse into Deranged Animation.
• Jerk with a Heart of Gold: Says he cares only about outward appearances, but from Episode 5 on it becomes evident that he genuinely cares for Maki.
• Ladykiller in Love: Through the course of the series he becomes so infatuated with Maki that he has eyes for no one else, despite her obvious lack of interest.
• Luminescent Blush: His face glows dark red after the group finds an old poster of him hanging on a wall; he was a former child model posing for a dentistry advertisement.
• Nice Guy: Despite his cynic and uncooperative attitude at the start, he has shown that deep down he is one of the nicest and most level-headed characters, highlighted specifically on his interactions with Maki through the series and with other characters on Episodes 8 and 9, when he points out Tenga's duty to chase after the crying Nico after she had her feelings for him forcefully exposed, repeatedly tries to hold back Tenga from punching Katsuhira, and overall tries to look after the Kiznaivers involved in the Love Dodecahedron.
• Not So Above It All: After his secret gets out, he curls up in the floor and tries to hide his face while explaining.
• Only Sane Man: As befitting of the "normal" part of his moniker, he's increasingly coming off like this among the boys, especially compared to the outlandish Hisomu.
• Parental Abandonment: His parents weren't around much as a child, so most of his meals were from the convenience store. This led to his chubbiness.
• Personality Blood Types: Type A.
• Picky Eater: He can only eat ground meat, rice, or his vitamins. Despite this, he shows no problem in ordering a massively-sized ice cream cone.
• Pretty Boy: Tall, slender, and very popular with the ladies.
• Stunned Silence: Hisomu's orgasm literally leaves him at pause◊.
• Used to Be a Sweet Kid: Implied in episode 11, he used to be happier or friendlier when he was young.

Honoka Maki

Voiced by: Rina Sato (Japanese), Lori Bachynski (English)

The High-and-Mighty

An aloof, bespectacled girl in class 2-A, Honoka seems to hold her fellow classmates in disdain.

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• Bookworm: Often seen reading a book at school.
• Break the Haughty: Goes through this in Episode 6.
• Buxom Beauty Standard: Yuta points out her large breasts as a major charm point. She tells him his were probably bigger in grade school.
• Chubby Chaser: Played for laughs in the end, she wants Yuta to pudge out at least a little so he doesn't look attractive to other girls.
• Color Motif: Her theme color is brown.
• Cynicism Catalyst: Resulting from Ruru's death.
  Maki: I don't care about myself at all. I don't care if I break.
• Curtains Match the Window: Has light brown hair and eyes.
• Dark and Troubled Past: Episode 6 reveals she used to be a popular mangaka going by the pen name Charles de Macking, who wrote a manga with her friend Ruru, who was diagnosed with a kidney disease at birth. When Ruru confessed her feelings, Maki turned her down since she couldn't bare the thought of losing her as a lover (much less a friend) and believes that Ruru succumbed to Death by Despair because of her.
• Dark Secret: She blames herself for breaking her friend Ruru's heart out of fear of her own grief being intensified if they were lovers.
• Deadpan Snarker: Oh, very much so.
  Honoka: I think you now know that I have a terrible personality.
• Defrosting Ice Queen: The end result of Episode 7.
• Embarrassing Nickname: Doesn't think very highly of her old pen name, "Charles de Macking."
• Establishing Character Moment: Telling Yuta and his admirers that she might catch something by hanging out with them lets the audience know she's not exactly the friendly type. Indeed it's later mentioned by others and by herself that she has a terrible personality.
• First-Name Basis: Yuta refers to her as "Honoka-chan", much to her initial annoyance.
• The Gadfly: Jokingly confesses that she killed someone at the end of episode 2. Later turns out to be a Sarcastic Confession, since it was Metaphorically True.
• Geek Physique: While she seems to have a nice body, episode 3 lets clear that her stamina is way below the rest of the group. After running around the town chasing Hisomu, when they finally get to him, she is bent down and heavily breathing while the others seem perfectly fine.
• Hidden Depths: She used to be a popular mangaka. The other Kiznaivers also believe deep down she is really lonely, since she always answers their calls.
• Ice Queen: She has shades of this, even being called the "High-and-Mighty" by Sonozaki. Tsuguhito tries to flirt with her, but she brushes him and his admirers off, saying that she might catch something by hanging around them.
• I Just Want to Have Friends: After episode 7, she starts developing this.
• Jerkass: She's not joking about the terrible personality. She even brings Nico to tears by denying that any of them are her friends.
• I Was Just Joking: How she covers up her confession in episode 2.
• The Lost Lenore: Is still hung up on Ruru.
• Metaphorically True: When she says she killed someone, she means that she killed off the friendship she had with Ruru.
• Non-Uniform Uniform: Wears a grey sweater vest which may be part of the uniform considering the school badge on it, but no one else is ever shown wearing one. She also ditches the ribbon.
• Personality Blood Types: Type A.
• Proper Tights with a Skirt
• Slasher Smile: Periodically shows one.
• The Stoic: Remains calm and collected throughout her appearances. However, she does have her Not So Stoic moments, such as her Dark Secret regarding her deceased friend and unrequited crush, Ruru, and her very visible disgust at Hisomu's orgasm from the pain.
• "Stop Having Fun" Guy: While everybody is playing shiritori, she tells them to stop so she can ask Sonozaki about the Kiznaivers.
• Teens Are Monsters: While the majority of the Kiznaivers have fairly understandable secrets expected of teenagers, the revelation and her gleeful smile when she admits that she's killed someone before implies this to be the case for her. Ultimately averted, since she's joking. Now it implies something else.
• They're Called "Personal Issues" for a Reason: Seems this way, as she is the only one that Noriko exempts from self-introductions and isn't particularly inclined to share her darkest secret with people any time soon. Until episode 7, that is.
• Took a Level in Kindness: After dealing with her grief over Ruru she starts being nicer and more open to the idea of being friends with the Kiznaivers.
• Tsundere: Has shades of this, in a platonic way for her friends. She pretends to care for them less than what she actually does.
• Wham Line: In episode 2:
  Honoka: I've killed someone before.
• What the Hell, Hero?: Nico calls her out in the last episode, when she thinks that it's pointless to do anything for Katsuhira or Sonozaki, since they are not connected anymore and Sonozaki caused nothing but trouble, even pointing out she had already got rid of them.
  Nico: I don't care about Sonozaki, no matter how tragic was her life, but if Katsuhira... if my friend... wants to save the girl he likes, Nico is going to help!
• When She Smiles: She's given a few Slasher Smiles before episode 7, but by then, she gives a legit happy smile to the other Kiznaivers, to their pleasant surprise.

Yoshiharu Hisomu

Voiced by: Kōtarō Nishiyama (Japanese), Hans Wackershauser (English)

The Immoral

A Sugomori High School student with an extremely low attendance rate scheduled to repeat his second year in class 2-A, and is seemingly a strong masochist. His Kiznaiver code number is 7.

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• Always Someone Better: He is the someone better to both Yuta and Nico — many girls (including Nico herself) find him more attractive than Yuta, while he's even more eccentric than Nico, who lampshades this.
• Bishie Sparkles: They show up when he first shows his face to the other Kiznaivers in episode 3.
• Clueless Chick-Magnet: It only takes him going to class once for the girls around Yuta to focus on him instead, but Hisomu is yet to notice.
• Color Motif: His theme color is purple.
• Dark and Troubled Past: Averted and lampshaded. He doesn't have any trauma to explain why he's so weird, and points out that not everyone has to have a tragic backstory to explain the way they are.
• Does This Remind You of Anything?: Hisomu really enjoys pain; the last scene of episode 3 is fully made to look like he is coming after intense masturbation to the point of placing his hand above his crotch while he moans loudly. Yuta and Maki are understandably grossed out.
• Eerie Pale-Skinned Brunette: His seriously doesn't have a healthy complexion.
• Establishing Character Moment: His Immodest Orgasm at the end of the episode he's introduced.
• Evil Cannot Comprehend Good: When feelings of love start to spread between the Kiznaivers, he seems to really dislike it, preferring to poke on Maki's past to get the emotional pain back.
• Extreme Omnisexual: He states in episode 4 he enjoys the pain and it doesn't matter whether it be a man, a woman or nonhuman that causes said pain. In fact he's really excited over the idea of sharing pain with a fish.
• The Friend Nobody Likes: He doesn't exactly leave a good first impression on the others, and his quirkiness strains their further interactions. Averted in his relationship with Nico and Katsuhira, though.
• The Ghost: In-universe. Apparently, every character knew of his existence beforehand, but as he never went to school, they never met.
• Hidden Depths: He is far more well adjusted and nicer than what one could originally think. This is particularly shown when he and Katsuhira become closer.
• The Immodest Orgasm: When Maki, Nico and Yuta find him at the end of episode 3, he is blushing, smiling and drooling while moaning very loudly.
• Informed Attractiveness: Yuta freaks out over and girls in their class confirm that Hisomu outranks Yuta in-universe, though some of the expressions he makes might make the viewer wonder how.
• It's All About Me: Leaves this impression, as after becoming a Kiznaiver he continues to hurt himself even knowing that now other people also feel his pain.
• The Lancer: Becomes this to Katsuhira after the group go their separate ways, as he is the only one that still visits him.
• Nice Guy: Strangely, he is this when he doesn't try to get everyone to hurt themselves. He is Nico's friend, goes along with Tenga's jokes, always goes to the group's get-together and becomes Katsuhira's supporter after the group goes their separate ways, working with him and Nico to get the group together again.
• Odd Friendship: In episode 4, he and Nico seem to be connecting. He also has this with Katsuhira later on. Best shown in episode 10, when he easily accepts Nico's request to stay friends and is the only one at first to still see Katsuhira as one.
• Personality Blood Types: Type B.
• Pretty Boy: Even prettier than Yuta. He's attractive to the point where Nico compliments his beauty and Yuta fears he would grab the girls' attention away from him if he ever attends school again; and he does. ^note Not that he's noticed yet anyway.
• Second Episode Introduction: Doesn't appear until episode 3.
• School Sport Uniform: Hisomu seems to have lost his formal uniform shirt, therefore he shows up to class wearing his name-tagged sports uniform tee with his formal uniform pants.
• The Thing That Would Not Leave: According to Chidori. She thinks Hisomu spends so much time in Katsuhira's apartment he moved in just like Tenga.
• Token Evil Teammate: He seems to be more than willing to hurt the other Kiznaivers just to feel pain, like poking Maki's traumas to try to spread emotional pain and erase the warm feeling Nico created.
• Too Kinky to Torture: His sin is "The Immoral" and clearly has an orgasm after feeling Katsuhira getting hit by a car.
• Yandere: Has shades of this, as after Katsuhira shows interest on him, he asks him if he could die for him and almost throws him in the street.

Kizna Committee

As a Group

• Big Bad: They are the antagonists of the series.
• Benevolent Conspiracy: They have nice ideals.
• The Chessmaster: They manipulate various situations to force the Kiznaivers to act in such a way to force the Kizuna System forward, such as scaring them, isolating Chidori, and forcing them to realize their unrequited feelings for each others
• Karma Houdini: None of them receive any punishment for their heinous experiments. Noriko is at least made to give up the pain of her friends to redeem herself, but everyone else involved is fine by the end.
• Knight Templar: The Kizna Project was started with the noble intention of ushering in global empathy and peace, but the Committee as a whole are willing to kidnap and subject teenagers and young children to intense emotional and mental torture to achieve their goal.
• Well-Intentioned Extremist: To end the wars in the world, they are willing to torture teens and young kids emotionally and physically, kidnap them, force them to complete seemingly random missions just for the sake of it and so on, mostly done with no regards for the well being and long-term effects of doing so.

Noriko Sonozaki

Voiced by: Hibiku Yamamura (Japanese), Natasha Strickey (English)

"Everyone wants to carve their scars into someone else. Everyone wants to connect with someone else."

A stoic, mysterious girl who is responsible for running the Kizuna System and the Kiznaivers. Her methods are extreme and her goals are unknown.

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• Affectionate Nickname: Called "Nori-chan" by members of the Kizna Committee and later, Katsuhira. It's later revealed that the kids from the original Kizuna Experiment also called her that.
• Betty and Veronica: Veronica to Chidori's Betty and Katsuhira's Archie.
• Brought Down to Normal: In the end she breaks the original Kizuna link, essentially giving the pain and sensations back to all Kiznaivers, including herself, becoming by any means a normal, if slightly stoic, girl.
• Bungled Suicide: Implied to be what happened to her at the beginning of episode 1 and what she was going to do in episode 10.
• Chastity Couple: With Katsuhira, seeing as they're still young. But she teases Chidori that she'll gladly change that should Katsuhira decide to take action.
• Childhood Friends: Heavily implied to be the case with Katsuhira. It is.
• Call-Back: In episode 1 she is seen jumping from a bunch of toys piled together. The same pile reappears in the end of episode 11, with her on top of it.
• Color Motif: Her theme color is light blue.
• Covert Pervert: Heavily implied, in her interactions with Katsuhira. She corners him once and on another moment, she asks him if her smell turns him on. Even when she tells the Kiznaivers to look deep within themselves, she's gesturing as if she's groping herself. The end seems to confirm it.
• Emotionless Girl: Sonozaki doesn't really emote, keeping her voice at a level monotone at all times. She doesn't so much as bat an eye at torturing classmates or endangering their lives. This is justified in episode 10: she is constantly heavily sedated, nullifying her emotions and sensations, since the old experiment left her as the one receiving the pain of all 18 other children of the last Kiznaiver group for the last 12 years.
• Even Evil Has Loved Ones: The original Kiznaivers and Katsuhira, to an extent.
• First Girl After All: She and Katsuhira were childhood friends who the latter forgot as a side-effect of the early Kizuna Project being shelved, and she's the one he ultimately declares his love to.
• First Girl Wins: Considering she technically knew Katsuhira longer than anyone else.
• Forgotten First Meeting: First met Katsuhira when they were in an early version of the Kizuna Project. By the time the series starts, however, he's forgotten all about it. He eventually remembers.
• Freudian Excuse: Deconstructed by Nico. She states that Sonozaki's tragic past is not an excuse for the things she has done, and that she can't feel sorry for her, after the things Sonozaki put the Kiznas through.
• Freudian Excuse Is No Excuse: Nico deconstructs her Freudian Excuse by pointing out having a tragic past doesn't absolve all the terrible things she did to the Kiznaivers, and doing them only made herself less sympathetic.
• The Heavy: She has superiors as revealed in episode 5, but she's still the one running the Kizuna System, and she interacts with the Kiznaivers directly.
• Hidden Eyes: Every time she's shown as a child, she has these, so when we finally do see them, the reveal that she Used to Be a Sweet Kid comes at us full impact.
• Icy Gray Eyes: Her gray eyes go hand in hand with her cold, distant demeanor.
• I Just Want to Have Friends: The finale reveals the reason why The First Generation Kiznaivers failed to gain back their sensations was because of Sonozaki's own choice. Due to her Friendless Background, she took the Kiznaiver linkage as the only way to keep her friends connected to her, and was unwilling to let go of her friends' linkage in fear they will never be friends with her after the experiment ends. In the finale, she attempted to link herself with the whole city population to absorb everyone's pain in order to help her 5 closest Kiznaivers regain conscience.
• Non-Uniform Uniform: While she is in the same class as the others, her clothes are very different.
• Not So Stoic: Downplayed, but when Katsuhira tells her he is disappointed in her, she flinches. She also shows surprise when the Kiznaivers start to read each other's thoughts.
• Official Couple: With Katsuhira.
• Panty Shot: When she pushes Katsuhira down the school stairs, as he falls he's able to see up her dress and notices she wears a polka-dot print.
• Paper-Thin Disguise: She disguises herself as a pharmacist in the drugstore that Hisomu goes to in order to kidnap him. Her disguise is made only of glasses and a lab coat.
• Parental Abandonment: It's shown that she was alone in the Kiznaiver's grounds before the others were there. Who her parents are or who sent her there are never mentioned. It's just stated she was alone as long as she can remember.
• Personality Blood Types: Type AB.
• Smells Sexy: Believes this on herself.
  Sonozaki: Did the sweet smell of a girl excite you?
• The Stoic: She is generally an Emotionless Girl, though not entirely by choice. This ends up being downplayed as there are moments when she does show that she is capable of displaying emotions.
• Used to Be a Sweet Kid: Was much more cheerful before the side effects of the Kizuna Project kicked in.
• Well-Intentioned Extremist: The Kizuna System was designed to link people together through pain, thus teaching them of empathy and preventing war. However, Sonozaki pushes Katsuhira down a flight of stairs without provocation and kidnaps his classmates. She then implants the Kizuna System into them without their consent or knowledge. She also forces them to participate in an arbitrary self-introduction exercise without explaining the rules, where an incorrect answer will result in extreme bodily harm.
• When She Smiles: The last shots of the last episode are her smile.
• Young and in Charge: Sonozaki is the same age as the other characters, but she's in charge of taking care of the whole Kizuna System. Subverted as, though she is overseeing the project, it's clear there are people above her. As Urushibara explains, she's the idol of the Kizuna Committee.

Kazunao Yamada

Voiced by: Jun'ichi Suwabe (Japanese), Michael Adamthwaite (English)

Class 2-A's homeroom teacher who supposedly teaches chemistry. He seems to be uninterested in his job and lets his class slack off. He is a member of the Kizuna Committee, membership number 394.

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• Adults Are Useless: He doesn't seem to be a very good teacher, neither caring for his students nor teaching them.
• Affectionate Nickname: According to Sonozaki, his nickname is "Yaamada."
• Apathetic Teacher: He's seen playing a dating sim demo in class, allowing his students to use their cells and socialize, instead of teaching. He's also wearing what looks like a sleeping mask on his head. When Chidori asks him to confront Katsuhira's bullies, he shrugs it off by saying they wouldn't listen to him, and that Chidori should just tell Katsuhira to run.
• The Atoner: Implies that he considers continuing the Kizuna experiment the only way to make up for causing the suffering of the First Generation. It's also why he goes along with Sonozaki's plan.
• Big Bad: His complete apathy regarding the long-term consequences of the Kizuna experiment, as well as the fact that he appears to hold some superiority over both Sonozaki and possibly Urushibara, makes him the closest thing the show has to an antagonist.
• The Chessmaster: He is the one separating the Kiznaivers in the school to get them to deal with strong emotions, both positive and negative.
• Even Evil Has Loved Ones: He truly cares for Sonozaki.
• For Science!: He is willing to manipulate and emotionally torture the Kiznaivers to further trigger the Kizuna system powers.
• Groin Attack: Urushibara gives one after he tries to stop her from going to the school.
• I Shall Taunt You: Deliberately taunts all Kiznaivers in episode 10, recalling their adventures in very vague terms, to not seem it was directed at them. He does this particularly to Tenga.
• Jerkass: Way worse than Urushibara and Sonozaki in regards to what he is willing to do to move the Kizuna System forward, not really caring who gets hurt.
• Karma Houdini: Like the rest of the Kizna Committee, but it's especially blatant for his Jerkass attitude and role as Sonozaki's helper during her brief Assimilation Plot. He goes against the rest of the Committee's wishes and almost destroys the city in the process, but by the epilogue, he's back with them and satisfied that their goals were ultimately accomplished.
• Knight Templar: Showing serious signs of this as of episode 9 for his willingness to completely break the Kiznaivers if it means world peace can possibly be achieved.
• Lovable Sex Maniac: Between playing a dating sim demo and asking his students to send him pervy videos of themselves, it's no surprise that so many of said students openly call him out for being a pervert.
• Messy Hair: Probably a case of bed head.
• Undying Loyalty: He'll do whatever Sonozaki asks of him and couldn't care less about much else.

Mutsumi Urushibara

Voiced by: Mie Sonozaki (Japanese), Jennifer Cameron (English)

The school counselor who expresses an unusual fondness for Noriko Sonozaki. She has a Noriko keychain strapped to her phone, and is a member of the Kizuna Committee. Her membership number is 328.

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• Action Girl: When driving in the last episode.
• Affectionate Nickname: She calls Noriko "Nori-chan", while her own nickname is "Urushii."
• Ax-Crazy: What's her response to deal with a couple of teenagers offhandedly remarking that they should kill Tenga? Intimidate them with a real gun, kidnap them, then torture them by forcing them into their own Kizuna link.
• Big Sister Instinct: She states that her life as a scientist for the original Kizuna System was like having a bunch of younger siblings. It's unknown if Yamada felt the same.
• Establishing Character Moment: The second time we see her, she's playing a first-person shooter at the arcade; while she's giving "advice" to Kamaishi and Yoshizawa, she brings out a real gun and starts shooting up the machine.
• Even Evil Has Loved Ones: She seems to be have this for Sonozaki since she was a kid, and for all original Kiznaivers.
• Everyone Has Standards: She is not comfortable with the mission in episodes 8 and 9, feeling they are manipulating the Kiznaivers and are going to break the kids if they don't stop.
• Freeze-Frame Bonus: Mutsumi receives the start-up notice of the Kiznaiver Project via her smartphone. This and her interaction with Yamada imply that both of them are aware of Class 2-A's selected students becoming Kiznaivers.
• Ms. Exposition: She explains in detail the workings of the Kiznaiver system, the whole history of the original Kiznaivers and Sonozaki.
• Team Mom: For the Kizuna Committee. After a while, she also shows signs of this for the Kiznaivers.

Gomorin

Sugomori City's mascot.

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• Cartoon Creature: Just what is Gomorin, anyway?
  Kid: His face is weird!
• Evil Counterpart: Sonozaki has a more malicious group of them complete with a black color scheme.
• Hiding in Plain Sight: They're actually all members of the Kizuna Committee in disguise.
• Red Eyes, Take Warning: They have red and black eyes and as helpers in the Kizuna System, they are the ones who abduct the Kiznaivers and torture them.
• Series Mascot

The First Generation Kiznaivers

^{Click to see their images} 

Most top identified to be Yuki, while the girl with blue hair is assumed to be Asuka.

Composed of 19 children 12 years prior to where the story started, The First Generation Kiznaivers were mostly children of The Kiznaiver Project's researchers and sponsors. Katsuhira and Sonozaki are revealed to be part of this generation of Kiznaivers, with Sonozaki releasing the names of 3 of the 5 people she was close to: Yuki, Shiori, and Asuka, while Katsuhira released the last 2: Pon-chan, and Tonko; who all unfortunately couldn't be released back into society due to total loss of sensation.

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• Disease Bleach: Due to Sonozaki absorbing the emotions and pains of all 18 Kiznaivers, those 18 Kiznaivers ended up unable to physically manage their senses properly, with the unfortunate ones losing all of their senses, complete with a full head of white hair. Katsuhira was one of the lucky ones able to hold the minimum required amount of emotions to function on his own, and to be released back into society.
• Empty Eyes: What those who became sensational vegetables have.
• Empty Shell: Most of the children have become hollow remains of their former selves.
• Used to Be More Social: All children were normal, playful kids went they first gathered, but once their experiment had Gone Horribly Wrong, all children were affected by various levels of sensation loss. Even the fortunate ones who were able to be released from the Kiznaiver experiment were in no way capable to fully regain their senses back. Until the committee tried the experiment once again with Katsuhira in his teenage phase to see whether he can rehabilitate his condition.

Others

Yoshizawa and Kamaishi

Voiced by: Eiji Miyashita (Yoshizawa) and Kento Hama (Kamaishi) (Japanese), Alex Bergen (Kamaishi) (English)

From left to right: Yoshizawa and Kamaishi.

Two students from the homeroom class neighboring 2-A. They bully Katsuhira for his money.

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• Ass Kicks You: Yoshizawa ends up with Tenga's ass shoved in his face.
• Ax-Crazy: Yoshizawa is really bent on killing Tenga.
• Bound and Gagged: They get kidnapped by Urushibara.
• The Bully: These two are introduced as Katsuhira's bullies, trying to shake him down for money. They end up serving as part of Tenga's Establishing Character Moment, to their detriment.
• Bully Brutality: Yoshizawa suggests killing Tenga at one point.
• Jerkass: They regularly pick on Katsuhira and beat him up if he doesn't pay them. Not exactly the friendliest guys around.
• Never My Fault: Yoshizawa blames Tenga and his Bully Hunter status for their lack of money and being kidnapped, completely forgetting that, if he hadn't picked on Katsuhira for starters, nothing would have happened. Meanwhile, Kamaishi blames Yoshizawa for all the problems in his life, not getting girls or good grades since they hang out together. It never occurs him to stop the friendship.
• One-Hit Kill: Nico knocks Yoshizawa out with one single hit.
• Synchronization: Urushibara turns them into Kiznaivers.
• Those Two Guys: Yoshizawa and Kamaishi are never seen apart from each other.
• Too Dumb to Live: They return for the finale to pick a fight with Tenga now that they can no longer feel pain. The resulting Curbstomp Battle happens offscreen and when the audience sees the results, Tenga is snarking about them being immune to pain didn't suddenly make them better fighters.
• What Happened to the Mouse?: It's given no explanation of what happened to them after episode 5, but it's later subverted when they are shown without the Kizna Link and working at a convenience store.

Ruru

Voiced by: Sayaka Nakaya (Japanese)

An old friend of Maki's, with whom she wrote a popular manga.

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• Almost Kiss: At one point she's mere inches away from kissing Maki before Maki pushes her away at the last second.
• Ambiguously Evil: Had she manipulated Maki to curse her forever, or had she legitimately tried to make it up to her through the letter in their manga's last chapter?
• Death by Despair: Her parents don't seem to be aware of Ruru's unreciprocated feelings towards Maki, causing them to believe Maki was to blame for Ruru's disease acceleration due to Maki cutting off their friendship.
• The Lost Lenore: Implied to be this to Maki.
• Love Hungry: Ruru was implied to have psychologically manipulated Maki into "remembering their friendship", leaving Maki in constant anxiety whenever she recalls Ruru from memory.
• Posthumous Character: She died years before the series started.
• Satellite Character: All her role revolves around Maki.
• Walking Spoiler: Knowing her will reveal Maki's past.
• Youthful Freckles

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