Characters: Kokoro Connect
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The Student Cultural Society
Though Taichi doesn't speak much, he's very sympathetic towards others and wants to help his friends when they're having trouble. He tends to become very passionate and gets carried away whenever he starts talking about his hobby, pro-wrestling, and Inaba stops him when he tries to add wrestling topics to their Student Cultural Society's newspaper. He has a little sister in elementary school, Rina.
In the story he is the prime example of Chronic Hero Syndrome
and Martyr Without a Cause
. This trait of his is explored both as his greatest strength and weakness as the series progresses.
- 10-Minute Retirement: Temporarily stops helping his friends after an argument with Aoki that ended with him accidentally hurting Iori.
- Apologizes a Lot: Part of his Nice Guy shtick. He's always the first to apologize when something goes wrong.
- Big Word Shout/Say My Name: In episode 5: NAGASE!
- Brown Eyes: Designate him as a more grounded, reliable member among the StuCS.
- Cannot Spit It Out: Taichi seems to have a lot of trouble expressing his feelings to girls.
- Chivalrous Pervert
- Chronic Hero Syndrome: Oh, SO MUCH.
- Deconstruction: In every arc, his repeated attempts at being selfless end up either straining his friendships, or causes more harm down the road.
- Eventually, by the time of Heartseed's 6th phenomenon, his underlying Martyr Without a Cause problem is brought to light, and the arc highlights how Taichi lacked a mind of his own, that he merely blindly responded to the wishes of others and never stop to think about his own perspective, approach or responsibility to the situation, or whether it was in the best interest of the others. In both Inaba and Fujishima's words: He is like a mindless, RPG game avatar. This eventually led to him causing trouble in the school and injury for his classmates, as well as Inaba breaking up with him, who was deeply pained by his seemingly lack of concern regarding their relationship. It was a harsh lesson for him.
- Dark Secret: His deep, dark, dramatic secret to Inaba is... he's thought about her (as well as Iori and Yui) while dating Rosie.
- Deadpan Snarker
- Double Standard: Abuse, Female on Male: Courtesy of Inaba.
- Epiphany Therapy: Taichi acts as therapist to everyone during the Hito Random arc, but he only manages to put them on the track towards overcoming their problems.
- Fan Boy: Of Professional Wrestling. His friends hardly share his passion.
- First Kiss: Is Iori's first... and at the same time, Inaba's... It's a Long Story...
- The Heart: According to Iori.
- Heroic Sacrifice: Taichi seems to desperately want to pull one off any chance he can.
- The Idealist: His advice to others is always filled with overwhelming idealism and optimism, though maybe that's just what they need to hear at the time.
- In-Series Nickname: "Selfless Freak."
- It's All About Me: Revealed that his constant need to help people is his own way of dealing with his own pains, so in a way it is selfish.
- Inverted later in that he doesn't really think for himself. See Deconstruction above.
- Jobber: Taichi respects Professional Wrestling jobbers because of the way they endure pain and lose for the sake of bolstering a fellow wrestler. This philosophy reflects Taichi's own character.
- Knight in Shining Armor: How others start to see him, but Taichi is not without his flaws.
- Laser-Guided Amnesia: He loses his memories of the Cultural Club and everyone in it due to the Forced Termination phenomenon in Nise Random. He manages to recover thanks to Chihiro and Shino's efforts.
- Loss of Identity: By Yume Random it is full blown. Taichi has become so wrapped up in playing the hero he has completely lost sight of himself.
- Love Confession: Gives one to Iori and receives one from Inaba
- Man, I Feel Like a Woman : The first time Taichi switches bodies with Iori, his first action is naturally to grope himself.
- My God, What Have I Done?: Due to his personality, he has done quite a number of things that he regrets right away throughout the series. Such actions include hurting Iori and allowing his selfless obsessions to get between him and Inaba.
- My Sister Is Off-Limits!: Taichi tends to get quite anxious anytime his Rina is the focus of anyone's attention.
- Nice Guy: Aside from his Chronic Hero Syndrome tendencies, Taichi is a very sweet guy at his core.
- Not So Different: In the 6th arc, Heartseed claims the two of them are quite similar. Inaba points it out to Taichi once more later.
- Not What It Looks Like: A magnet for these kinds of situations. Typically leads to a She Is Not My Girl Friend moment.
- Official Couple: Goes out with Inaba at the end of Michi Random.
- Oh, Crap: Almost constantly throughout Episode 5.
- "The Reason You Suck" Speech: Gives Inaba one after his impulses are unleashed in Episode 7, though he regrets it.
- Second Love: With Inaba, after concluding his relationship with Iori at the end of the anime
- Secret Keeper: Is such to many of the characters who Taichi acts as therapist to. Also keeps the existence of No.2 a secret under threat.
- She Is Not My Girlfriend: At one point or another denies being so to Iori and Yui.
- Ship Tease: Definitely with Iori.
- And a lot of it with Inaba.
- Plus some non-comedic examples with Yui.
- And with... Aoki
- Taking the Bullet: Takes a lead pipe to the head while protecting Inaba from a thug. He recovers.
- Tempting Fate: When Iori first open up her identity problem to him, he promised that "No matter what happens, no matter what you've become, I will know that Nagase is Nagase." Well... guess what happens next episode...
- Triang Relations: Type 4 with Iori and Inaba at the end of Kizu Random arc.
- The Unsmile: According to Yui and Aoki. In fact, of all the main characters, Taichi seems to show his pearly whites the least.
- What the Hell, Hero?: In episode 8, when Iori tries to get between him and Aoki to calm both of them down from their heated argument, his impulse "unleashed" and he violently shoved her aside towards a locker, injuring her. Taichi is left horrified by his actions, but what he's most ashamed of is that his desire being unleashed proves a part of him really did mean it.
Iori is Taichi's classmate, a bright, friendly, popular girl. She's the president of the Student Cultural Society, but rather than lead everyone, she sets the mood and gets them excited. Occasionally she takes bold actions in front of others, be it due to carelessness or simple naivety.
She had 5 different fathers in the past. And as her first stepfather turned out to have violent tendencies, she had learned to alter her personality to appease and fit the expectations of others to the point where she had become unsure who she was originally supposed to be.
- Abusive Parents: Her first stepfather turned out to be like this and he became the reason why Iori started taking on multiple personalities.
- Achilles in His Tent: her persona-changing proves instrumental in saving Inaba from the Hostage Situation
- Amicable Exes: With Taichi.
- Beauty Mark: Below her mouth.
- Became Their Own Anti Thesis: In Michi Random when Iori decides to finally "solve" her Loss of Identity.
- Beneath the Mask: As revealed in Michi Random, her true self is moody, critical and angry. It is later revealed that this was just another extreme persona Iori conjured up, hoping it was her true self. Eventually, Iori decides to just stop caring and act however she likes. The true Iori is something in between the extremes, bubbly and loving, but also firm when she needs to be.
- Berserk Button: Don't harm her friends. Just... don't.
- Break Them by Talking: Hurls a barrage of Armor Piercing Questions at Inaba and Yui both in Michi Random, leaving both speechless.
- Broken Bird: A traumatic childhood has seeded self-loathing and bitterness in Iori.
- Cuddle Bug: She isn't afraid to get touchy-feely with others.
- Everything but the Guy: Iori ultimately decides against dating Taichi. By the end of the series, she remains single, but has grown significantly as a person, rescued her mother from a terrible decision, amassed a group of loving friends, and conquered her Loss of Identity. She does admit she wouldn't mind getting a boyfriend eventually though...
- Expository Hairstyle Change: After the events of Michi Random, she no longer wears a pigtail and grows her hair long
- Face Death with Dignity: When told of her impending death in Hito Random, Iori is brave and chooses to spend her last moments speaking to her friends. However...
- First Kiss: Was taken by Taichi... in Inaba's body
- The Gadfly: She's not really as goofy as she seems, most of it is just an act to push some buttons or rustle up some laughs.
- Genki Girl: Fun-loving, expressive and a bursting with energy. Taichi considers Iori the source of the StuCS's spirit.
- I Want My Beloved to Be Happy: Zig-zagged. She wants Inaba to win Taichi, but also won't give him up without a fight.
- Large Ham: Bursting in through doors and shouting randomly is general business for Iori.
- The Leader: Develops into a Type IV, the core and heart of the Cultural Club. Initially, however, Iori is overshadowed as leader by the more assertive Inaba.
- Leaning on the Fourth Wall: In the Michi Random arc, she asks why everyone treats her like a "tragic heroine who needs saving."
- Let's Fight Like Gentlemen: Non-violent example with Inaba over Taichi.
- Loss of Identity: She suffers from this ever since she started assuming different personas for different situations.
- Modesty Shorts: Never leaves home with 'em.
- The Nicknamer: She coins several names such as "Inaban" and "Dereban" for Inaba, and later "Chihhi" for Chihiro.
- Notable Non Sequitur: Any conversation she has with Taichi tends to have a cryptic hint of something that's to come sprinkled in.
- Perpetual Smiler: She seems to be this, but is actually...
- The Pollyanna: The personality she actively tries to cultivate, but she's proven to have her limits.
- The Power of Acting: A skill acquired from years of faking personas. It was enough to keep her violent stepfather at bay, and fool Taichi, too.
- Rage Breaking Point: She finally snaps in Michi Random.
- "The Reason You Suck" Speech: Gives one to Inaba at the end of episode 15. It was brutal.
- Sad Clown: Spontaneous and foolhardy, but it's all just a forced act. The true Iori is an insecure and lost soul.
- Shipper on Deck: After Michi Random she full-time ships Taichi and Inaba.
- Ship Tease: With Taichi, courtesy of Inaba.
- The Social Expert: A factor of her persona changing. Iori has become accustomed to reading and anticipating the social cues of others, allowing her to predict their motives and true feelings, which she can then adapt to.
- Split Personality: Not a case of actual different personalities, but more on the lines of her wearing multiple masks, while not having a mirror to see her own face.
- The Tease: She loves making perverted jokes around Taichi.
- You Gotta Have Blue Hair: Although the actual color is rather inconsistent, shifting between purple and dark blue.
Himeko is vice president of the Student Cultural Society. She excels in gathering information and analysis, possessing private data on each of the club members. She's calm and logical, but she's also rather blunt, so she has difficulty dealing with delicate situations.
Due to certain reasons she prefers everyone else, with the exception of her family, to addressed her by last name, Inaba. She had an inherent difficulty in trusting anyone including herself. However, as she had pointed out herself, unlike her friends she did not experience any particular trauma; she was born with such personality. She deeply despises herself for this, which results in her rather negative self-esteem.
Yui is very active and expressive. She's a bit small, but she holds ranks in Karate, and even won tournaments when she was in middle school. She absolutely loves cute things, and her room at home is filled with fancy items. She always ends up insulting Aoki when he tries to approach her. It was revealed that Yui was a victim of attempted rape in middle school, which resulted in her androphobia.
- Action Girl: An accomplished martial artist. Puts her Karate skills to good use when she, Taichi, and Aoki rescue Inaba in Episode 17.
- A-Cup Angst: Doubles as her Berserk Button.
- Anchored Ship: Type 3 with Aoki.
- Cuteness Proximity: Yui loves plush dolls, but pretty much anything cute turns her to goop.
- The Cutie: The others outright admit they tease Yui just to see her cute reactions.
- Cute Bruiser: Cute as a button, but she can lay you out if she has to!
- Does Not Like Men: She was almost raped in middle school and, as a result, developed androphobia. She tries her best to hide it so as to not put off her friends.
- Face Your Fears: A major theme of Yui's character is learning to confront her insecurities and phobias rather than letting herself be victimized.
- Girls Love Stuffed Animals: Her room is full of them.
- Groin Attack: Taichi kicks her there during a body switch while teaching her how to Attack Its Weak Point.
- Hair Decorations: Her little hair clips.
- Heroic BSOD: Gets a nasty one for most of Kizu Random.
- Laser-Guided Amnesia: She loses her memories of the Cultural Club and everyone in it due to the Forced Termination phenomenon in Nise Random. She manages to recover thanks to Chihiro and Shino's efforts.
- Official Couple: With Aoki by the end of Yume Random.
- Older Than She Looks: Her friends have to remind themselves that she's actually the same age as them.
- Rape as Backstory: Her androphobia stems from an attempted rape.
- Tsundere: Type B; the only person who gets the tsun is Aoki.
- Waif-Fu: Has a black belt in Karate, believe it or not and can easily knock out boys twice her size.
- Weight Woe: Generally speaking, Yui does not like any attention to be on her figure, ever.
- Wide-Eyed Idealist: Having never been in a relationship before, Yui's idea of romance is shown to be quite... romanticized.
- The Worf Effect: Is tossed aside by Heartseed in their first encounter.
- Worthy Opponent: To Mihashi
Yoshifumi is Yui's classmate. He holds affection for her, and continues his attempts to approach her, but she never gives him a chance. In the Cultural Research Club he's often called out, and his pathetic side stands out more, but he also relaxes them with some of his casual statements.
- Abhorrent Admirer: For Yui. It's later subverted, since she doesn't dislike the idea of them becoming a couple, but her androphobia makes it very hard for her to accept his feelings.
- Anchored Ship: With Yui, but he's making progress.
- Book Dumb: Living as carefree as Aoki is a double edge sword — he's rarely takes studying seriously.
- Bromantic Foil: To Taichi, being the goofy, pervert to contrast Taichi's mature personality.
- Butt Monkey: His friends rarely take him seriously, and always seem to look down on him even when they compliment him.
- Chivalrous Pervert: Is willing to help his beloved Yui... by inviting her to a love hotel.
- Comically Missing the Point: Inaba confesses that she doesn't trust her friends and Aoki gets excited because she's paranoid of everyone, not just him.
- Double Standard: Abuse, Female on Male: Is practically the Chew Toy along with Taichi, but Aoki receives far more of this than the latter.
- Dumb Is Good: Aoki is simultaneously the nicest member of the Student Cultural Society, and the dumbest.
- Hypocritical Humor: "Trust is important these days, right? I would never abuse someone else's body!" The very next episode he's posing for cute pictures with Yui's body. He gets caught.
- Last Name Basis: Strangely, no one ever calls Aoki by his given name.
- Love Confession: Has apparently given many to Yui, and has apparently been rejected each time. However the latest one has shown that he still has a chance.
- Master of None: Not prone to breaking down as seriously as his friends, but lacks the capability to help others as much as he'd like.
- My Friends... and Zoidberg: Gets this from Yui and Inaba a lot.
- Official Couple: With Yui by the end of Yume Random.
- Over Shadowed By Awesome: Feels this way towards Taichi early on.
- Plucky Comic Relief: A Deconstruction of one. Jokes and silly antics are all Aoki has going for him, so he deliberately acts the fool to lighten the mood. Should he ever fail at this role, Aoki will become depressed since that would make him completely useless.
- "The Reason You Suck" Speech: Trades speeches with Taichi in episode 8.
- Sliding Scale of Silliness Versus Seriousness: Tends to stay in the silly range, but he has his moments.
- Static Character: Deliberate on Aoki's part. Despite Heartseed calling him useless to the others, Aoki insists that continuing to be himself is the best thing he can do for them.
School Staff and Students
Voiced by: Shizuka Ito
(Japanese), Carli Mosier (English)
Fujishima is Class 1-3's representative and as such, is a classmate of Taichi, Inaba, and Iori — the latter of whom she is madly in love with. After learning of Taichi's feelings for Iori, she becomes a sort of love rival to him.
- Bi the Way
- Break the Haughty: Downplayed, but Fujishima does not take it well when Setouchi is chosen as class representative instead of her during their second year. This becomes a turning point in Fujishima's character where she becomes more humble and her Large Ham qualities are mellowed.
- Cannot Tell a Joke
- Class Representative
- Friendly Enemy: To Taichi at first, but gradually turns into a straight, albeit awkward, friendship.
- The Heart: Throughout the series, whenever the heroes are in a rough patch they can't seem to resolve, she comes out to dispense advice or otherwise lend a hand. She does this for everyone in her class, as just after giving Taichi advice in episode 8, she answers a call from someone else about love problems.
- Hero of Another Story: The only supporting character who has a full length side story dedicated to her in the novel.
- Large Ham
- Love Freak: Fujishima takes it upon herself to make sure her fellow students are in good relations with each other whether they like it or not. She also loves to play matchmaker.
- The Matchmaker: She tries to set up Yui with Misaki and Taichi with Inaba, if just to get Taichi out of the way so she can have Iori to herself.
- The Rival: Fujishima declares herself as such to Taichi. Doesn't stop her from helping him whenever he needs it.
- Scary Shiny Glasses: She does this a lot.
- School Girl Lesbian: Played for laughs with Iori, who is terrified of her.
- Single-Target Sexuality: Iori, again.
- Team Mom: Thinks herself as this for her class.
Homeroom teacher of our unlucky group. Also serves as a host for Heartseed, who occasionally takes control of Gotou's body to explain something to our protagonists. Gotou in his place have no recollection of what happenes at those times. When he isn't spending his time possessed he is a very laid back and friendly teacher; gets by with having his students do his work for him. When he's actually serious he can give out surprisingly good advice, and seem like an actual teacher. However, any time when our protagonists are about to appreciate his wisdom, he reverts back to his usual goofiness (much to their chagrin.)
Voiced by: Yuuki Ono (Japanese), Connor Leach (English)
A student of class 1-C and one of Taichi's close friends outside of the CRC.
A student of class 1-A and Yui's close friend outside of the CRC.
- Big Sister Instinct: Towards Yui, who she loves to look after and refers to herself as Yui's older sister.
- Lovable Sex Maniac: Loves to tease the main couples about sex at every chance she gets.
- Love Freak: Manufactures an elaborate triple date for her friends in Step Time just because she was dissatisfied with the intimacy between the couples. Taichi notes how she's starting to rival Fujishima.
- Satellite Character: To Yui, but gains more depth later in the novel.
- You Need to Get Laid: Awkwardly complains how Yui and Mariko do not get intimate with their boyfriends.
A student of class 1-C. She is known for hanging out with delinquents from other classes. Has a crush on Shiroyama Shouto. She did not take it well when Iori rejected the latter and began bullying her with her delinquent friends. She has gone as far as hiring delinquents from other school to sabotage the CRC's presentation. She regrets it though.
- Alpha Bitch: She gets better
- Class Representative: To everyone's surprise, she beat Fujishima in the class rep election for class 2-B and becomes one.
- Curtains Match the Window
- Expository Hairstyle Change: After the events of Michi Random arc, she reforms, cut her hair short and dyes it back to black.
- Green-Eyed Monster: Her crush confessing to Iori pushed her over the edge.
- Jerk Ass Facade: Thought acting tough would make her crush notice her more.
- Karma Houdini: Lampshaded, everyone is shocked by how easily Iori forgives her, even Setouchi herself.
- She even wins the guy she likes later in the novel. Justified in that she did her best to earn him.
- My God, What Have I Done?: After she finds out that her little revenge tactic went a bit too far. She hated Iori because the latter turned down a boy the former liked rather harshly, and acted very nonchalant about the whole deal. Then she gets a bunch of guys to ruin the CRC's club room, destroying it along with the work they had done for a presentation. And did not approve of the guys kidnapping Inaba to prevent her from identifying them after they were discovered to be the culprits.
Voiced by: Chinatsu Akasaki (Japanese)
A classmate and close friend of Iori.
A mysterious entity and the primary culprit behind the many paranormal phenomena that has been happening to the Cultural Research Club members. He communicates with the club members by possessing and speaking through Gotou Ryuuzen, their homeroom teacher and club advisor. His motives and objectives are unknown except for that he thinks the club members are "interesting" and wants to observe them.
Another "Heartseed" who debuts in episode 11, serving as the culprit behind the "Time Regression" phenomenon. It claims to be similar to yet independent of the Heartseed that the Cultural Club knows of. To keep things simple, it chooses to refer to itself as Number Two, as in the second Heartseed. Its motives seem to stem from its fascination of Heartseed's relationship with the club members.
Also worth noting that, unlike the first Heartseed, Number Two doesn't mind being malicious the slightest. It shows up again in Yume Random, to observe Heartseed. Heartseed is not pleased. And later, in the final arc as well.
Taichi's 10 year-old sister. To Taichi's bewilderment, she's quite knowledgable of love and relationships for someone of her age.
- Adorably Precocious Child: She likes to complain about how busy she is with her elementary school club activities and acts superior to her older brother, as if she is taking care of him.
- Big Brother Attraction: Invoked during episode 14, when she gives Taichi a "true love" chocolate during Valentine's Day. In episode 15, he has a talk with her about how Brother-Sister Incest is wrong, causing her to laugh and clarify that she was only joking about the "true love" part. She then kisses him on the cheek and tells him this was her "First Kiss", and Taichi gets really happy.
- Clingy Jealous Girl: Rina really doesn't like sharing her brother.
- Hypocritical Humor: She hates how the Cultural Club is always demanding Taichi's attention and threatens to call the cops on her brother for acting like a lolicon. Ok, you got all that? Go read the above tropes.
- Locked Out of the Loop: Painstakingly so because Taichi dedicates so much time to his sister. It's a challenge for him to keep such a clever kid in the dark about what's really going on. She learns the truth in Asu Random II.
- Sexy Santa Dress: Episode 11.
- Strong Family Resemblance: Looks like a gender-flipped child version of her brother.
- Wise Beyond Their Years: She gives Taichi relationship advice.
Iori's single mother. Although not all of them were marriages, she has been in a relationship with five different men who would serve as father figures to Iori.
- Beware the Nice Ones: Despite coming off as very patient and pleasant, she strikes and chases off her violent ex-husband after learning that Iori wants nothing to do with him.
- Beauty Mark: Like mother like daughter.
- Guess Who I'm Dating?: Reika decides to get back together with her previously abusive 2nd husband, the one that ruined Iori's childhood and forced her to start faking personalities, which is now preventing Iori from speaking up to her mother.
- I Want Grandkids: She assumes that Iori and Taichi are having a baby together and is delighted, though she states she was only joking.
- Mama Bear: If Iori is upset or possibly in danger, Reika will take action, sometimes violent action.
- More Hero Than Thou: Reika is willing to put up with her ex for Iori. Iori is willing to put up with her stepfather for Reika. Hmm.
- Parental Abandonment: She tends to work till very late at night, leaving Iori to take care of herself.
- Yamato Nadeshiko: He general nature is patient, kind, and warm. She also allowed herself to stay in an abusive relationship for the sake of her daughter.
Voiced by: Ayane Sakura (Japanese), Tiffany Terrell (English)
Yui's little sister. Surprisingly, she's taller than her older sibling. Tends to mistake situations pretty easily and hilarity ensues.
An acquaintance and rival of Yui back in her days of practicing karate. Debuts in episode 11.
- Action Girl
- Back for the Finale: Returns in Precious Time to participate in the Couples Battle Royale.
- Curb-Stomp Battle: Gives one to Yui. Of course, Chinatsu has been sharpening her skills the whole time and Yui hasn't, but it was still humiliating for her.
- The Promise: Yui made a promise, which she then forgot about, likely due to her attempted rape, to fight Chinatsu at the national karate tournament.
- Tomboy and Girly Girl: The tomboy to Yui's girly girl.
- Unknown Rival: Yui treats her this way initially in episodes 11 & 12. This only upsets Chinatsu even more.
- Worthy Opponent: Her whole reason for confronting Yui is to make her get back into karate so that Chinatsu can get the chance to beat her.
Aoki's ex-girlfriend and first love from middle school.
- Alliterative Name
- Amicable Exes: With Aoki.
- Cleaning Up Romantic Loose Ends: Aoki seeks out and meets with Nana in order to help himself move on from her. Nana, however, seems to have already moved on.
- Forgotten Childhood Friend: Aoki forgot about her until episodes 11 & 12, after he reverted back to an earlier age and his feelings for her resurfaced.
- Important Haircut: When Aoki came to see Nana for closure, she made a point of mentioning that she'd cut her long hair short back at New Years, possibly to show that she'd moved on with her life; Aoki's reaction to this statement seems to support this.
- Secretly Wealthy: Implied in the novel.
A new addition to the Student Cultural Society after the main cast entered their second year of high school. He is a fellow karate student whom Yui met in the dojo. When he entered Yamaboshi High, Yui convinced him to join the club.He became the interest of Heartseed in Nise Random, whom gave him the power to disguise himself as someone that the casts know, and requested him to do something "interesting".
- Arrogant Kung-Fu Guy: He's skilled at karate, which has done wonders for his arrogance.
- Bishounen: He's described as quite good looking, even somewhat androgynous.
- Easily Forgiven: One would be surprised at how light the club mates took it regarding the outrageous things he had done to them.
- I Just Want to Be Special: He wishes he had a more outstanding life, unsatisfied with his current self.
- Jerkass: He got better, though.
- Ineffectual Loner: Chihiro's dissatisfaction with life was unwittingly due to pushing others away. It is only after Chihiro begins involving himself more with his peers that he becomes more content.
- My God, What Have I Done?: After his meddling resulted in the memory loss of Taichi and Yui.
- Power Perversion Potential: After receiving the power to disguise himself as anyone he wants from Heartseed, Chihiro has himself a good ol' time messing with the StuCS.
- Pragmatic Hero: Chihiro has no problem cheating if he has to. It's how he defeated Yui during the Sports Festival.
- Tall, Dark and Snarky: He's considered pretty good looking, but he also tends to look down on others.
- Took a Level in Kindness: Initially full of himself and emotionally distant. Chihiro later becomes much more kind and helpful, though he keeps his irritability.
- Violence Is the Only Option: In Asu Random II, when the StuCS are surrounded by an angry mob of classmates, Chihiro is the first to suggest fighting their way out.
- You Gotta Have Blue Hair
A new addition to the Student Cultural Society after the main cast entered their second year of high school. She decided to join the club because she is in love with Taichi's voice.She became the interest of Heartseed in Nise Random, whom offered her the power to disguise herself as someone that the casts know, and requested her to do something "interesting". She rejected it at first, but eventually accepted it when things gone wrong and used the power to help.
- Cuteness Proximity: Dogs will always win her over.
- The Cutie: She's described as looking very adorable, like a small puppy.
- Fetish: Shino is absolutely enthralled by Taichi's voice. It can get a little creepy.
- Foil: To Chihiro. Both are dissatisfied with their lackluster lives, but whereas Shino tries to better herself, Chihiro brings others down.
- Heroes Love Dogs: She loves cute animals, but has a special soft spot for dogs.
- Heroic Self-Deprecation: Starts off thinking she's nothing special and fantasizing about being someone more interesting than she is.
- I Just Want to Be Special: Her desire is much more downplayed compared to Chihiro's, however.
- Innocently Insensitive: She tends to unwittingly say exactly how she feels, no matter how insulting.
A student of class 1-C. She is a member of the track team and has a very spirited personality. In one of the short stories in Clip Time, she makes a love confession to Yui
and Yui decides to gives her a chance, though she ultimately decides to just be friends.
The new student council president of Yamaboshi High. Debuts in the final arc and leads the hundreds of student to stand against Number Three(s)'s phenomena.
- Heel-Face Turn: Katori pretty much denounces his antagonism towards the StuCS and becomes an ally by the end of Asu Random II.
- Knight Templar
- Love Confession: Admits to having feelings for Iori during Precious Time, the final arc of the series. She turns him down since she only sees him as a friend.
- Student Council President
- Violence Is the Only Option: After seeing how those who suffer violence are removed from the Isolation Dimension, Katori comes up with the idea that violence really is the only option, and peace advocating individuals like the StuCS better stay out of the way.
- Well-Intentioned Extremist: He's really just trying to help the students escape the isolated dimension and freaky phenomena, however his methods are somewhat... questionable.
Debut in the final arc of the novel as the final antagonist(s) of the series. The culprit(s) behind dragging every first and second year students (except the main cast) of Yamaboshi High into their large scale experiment. Not exactly a single entity but rather how the main cast decided to call the unknown number of Heartseed(s) that took part in the phenomenon after they learn of their presence.