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The Ultimate Gamer and protagonist of the story. After the events that left her on the brink of death
, she was resuscitated by Izuru in secret. Waking up to find the world has changed completely, she now tries to recover while attempting to bond with Izuru and reconcile with what happened to her and her friends.
- Broken Pedestal: She starts the story proud of being a student of Hope's Peak. By the end, she's become so disillusioned with it as a result of the experiments on Hajime/Izuru, the refusal to do anything to bring down Junko, and the rampant elitism the school bred that she states the one good thing to come out of the tragedy was burning Hope's Peak to the ground.
- Friendless Background: The reason she's so attached to Hajime and Class 77 is because they were her first friends; before she attended Hope's Peak, she had none. The kids her age either thought she was weird or stuck-up. It's also implied in Expansion Pack that she got harassed for winning at tournaments.
- Gamer Girl: It is her talent. Fittingly, her narration is peppered with video game references, and she uses games to try and bond with Izuru.
- Heroic Self-Deprecation: Chiakis self-esteem is pretty much destroyed by the events of Side:Despair Episode 10; once she remembers the full details of what happened, she rips herself apart for having such poor wisdom. Even after she gets through her depression, she tends to put herself down and doubt her own judgment.
- Hurting Hero: She's carrying a lot of pain, between what happened to her friends and the trauma of being almost killed.
- Knight in Sour Armor: The ordeal she went through causes Chiaki to acknowledge that the good guys don't always win and you can't always trust people in authority. However, instead of letting this embitter her, she considers it a lesson so she can keep being a good person and helping others without repeating past mistakes.
- Lonely at the Top: The first chapter of Expansion Pack implies she would get harassed for winning at tournaments. Eventually she stopped going because she thought it would be more fun for everyone if she wasn't there.
- Lonely Rich Kid: Her parents showered her with money and video games in lieu of actual affection, and she had no friends before entering Hopes Peak the other kids mistook her shyness for being stuck-up and thought she was weird for loving video games so much.
- Love Makes You Dumb: She literally blurts out her Love Confession to Izuru, then stumbles through explaining it with no eloquence.
- Misunderstood Loner with a Heart of Gold: In her past. She was always focused on video games and kept to herself because she didn't know how to connect with people. Unfortunately, this caused them to think she was snooty.
- My Greatest Failure: After she remembers the events of Episode 10 of the Despair Arc, it seems hardly a day goes by when she doesn't view her hasty rescue attempt as this. It takes months of recovery to get to the point where she resolves to make up for her mistake, resulting, of course, in her attempt to join the Future Foundation.
- Nice Girl: Her kindness was not damaged in the slightest by her ordeal.
- No Sense of Personal Space: In her own words, Chiaki is weirdly touchy. Izuru isnt particularly bothered by it, but Kanon finds it uncomfortable when Chiaki sits too close.
- Official Couple: Eventually with Izuru/Hajime.
- Secretly Selfish: While Chiaki is a genuinely sweet and altruistic person, shes also starved for attention and greedy for friendship, to the point shed rather Class 77 and Chisa continue terrorizing the world than get caught by the Future Foundation. The biggest reason she withholds information about Chisa being The Mole is because she prioritizes reuniting with her friends above all else.
- Shell-Shocked Veteran: Her ordeal in the maze left Chiaki with Post-Traumatic Stress Disorder, experiencing nightmares of her torture, being triggered by reminders (such as elevators), and subconsciously associating Kanon with Junko because of her makeup.
- Spirited Competitor: She does have a competitive streak, but more than anything else cares about having fun. Even though he always beats her, she keeps challenging Izuru to video games because she enjoys playing against him, and wants him to enjoy it too.
- Stepford Smiler: Despite everything she's gone through, Chiaki refuses to give up hope or her ideals and keeps forging ahead, even though she has a lot of baggage.
- Took a Level in Badass: Chiaki resolves to never be as helpless as she was in Side:Despair 10 again, and starts learning to protect herself when she joins the Future Foundation. It pays off majorly come Chapter 24.
- Trauma Button: The sight of elevators trigger Chiaki back to the events of Side:Despair 10. Neither she nor Izuru are aware of it when they watch the Killing Game, so when she sees Class 78 enter the elevator for the first trial, she has a complete meltdown.
Izuru Kamukura/Hajime Hinata
The Ultimate Hope and second protagonist
of the story. As he watches Chiaki die, remnants of his old persona, Hajime Hinata, move him to intervene, save and hide her. Despite staying to help her through her recovery, he still brews his own ulterior plans.
The former Ultimate Therapist, a wheelchair-bound young woman who only speaks through her rabbit avatar. She's the head of the seventh division and provides advice to Chiaki once she joins. Is killed by Monaca Towa.
- Ascended Extra: Goes from not even appearing on-screen before dying in canon to a recurring character. She also gets A Day in the Limelight in Expansion Pack.
- Ascended Fangirl: The reason her avatar is a magical girl? Miaya always used to watch magical girl anime and thought they were the coolest.
- Bunny-Ears Lawyer: Miaya is odd even for an Ultimate, as she only talks through her rabbit avatar Usami, but shes also very competent at her job and is a kind and reasonable woman.
- Companion Cube: Usami isn't just her avatar, but was based off an actual stuffed rabbit she carried around and spoke through when she was younger.
- Disappeared Dad: She's very close to her mother, but no father is mentioned. Expansion Pack reveals he died when she was a baby.
- Don't You Dare Pity Me!: In her chapter in Expansion Pack, it turns out Miaya always secretly hated the way people would pity her for being disabled, but never had the courage to say it.
- Nice Girl: Is one of the kindest people in Future Foundation, going out of her way to talk to lowly interns and comfort anyone who looks like they need it. She's even willing to help Makoto rehabilitate Class 77.
- Shrinking Violet: She was very withdrawn and shy as a child. Nowadays she's doing better, but still relies on a Companion Cube to talk for her.
- Wise Beyond Her Years: She displays an adult-like maturity as a child and teenager in Expansion Pack, which her mom compliments her on.
The former Ultimate Lucky Student and current Ultimate Hope. Having survived the Second Killing Game, he joins the Future Foundation's 14th branch, where he is eventually approached by Class 77...
- All-Loving Hero: Izuru specifically chooses him to "help" Class 77 because of this; out of everyone in Future Foundation, Makoto's one of the very few who would try to save Remnants of Despair. Even after witnessing the Killing School Trip and learning how he was used, Makoto holds no grudges and keeps protecting them.
- Forgiveness: Holds no ill-will for Hajime or any of Class 77 even after being used, put in danger, and being accused of treason because of them.
- Hope Bringer: His words alone can break a person's despair, as seen in the final trial of the Second Killing Game. In fact, this trait is the reason he was given the title Ultimate Hope.
- Nice Guy: Makoto is unequivocally nice to everyone, even Remnants and Remnant supporters. Even when suspecting Chiaki of being the latter, he still treats her with kindness and promises not to hurt her.
The former Ultimate Detective, a survivor of the Second Killing Game who becomes head of Future Foundation's 14th division.
- Declaration of Protection: Walks with Makoto into danger, without backup, because she's determined to protect him.
- Restored My Faith in Humanity: She's still rather skeptical and pragmatic, but Makoto's influence is a large part of why she believes in the power of hope.
- The Stoic: While unnerved by Class 77, her face doesn't show it at all, and she remains calm and collected even when she thinks they've been trapped.
- Workaholic: Chooses to translate "bed rest" as "working from bed"; even a near-death experience doesn't stop her.
- You Are in Command Now: With every other branch head dead or missing in the aftermath of the Final Killing Game, she ends up the Chairwoman by default. Makoto suspects she doesn't intend to stay in power long, but in the meantime she uses her position to cover Class 77's escape.
The former Ultimate Student Council President, leader of the second division, and vice-president of the Future Foundation. An extremist desiring to eliminate despair above all else.
- Authority Equals Asskicking: Vice-leader, real leader in all but name, and able to back it up. Not only did he fight Peko Pekoyama to a standstill in a duel, he's also rumored to have personally killed a hundred Remnants.
- Bad Boss: It's implied he kills other members of Future Foundation if he finds them in despair, and even a fellow branch head, Miaya, is afraid of him.
- Knight Templar: His mentality is that despair should be eradicated at all costs in order to usher in a peaceful era, and he holds no mercy for anyone who displays it.
- Unwitting Pawn: To Chisa. Many of his actions and beliefs are a direct result of her manipulations.
The former Ultimate Maid, teacher of Class 77-B, and Chiaki's trusted maternal figure, current head of the fifth division. Having been brainwashed, she's really a Remnant mole.
- Affably Evil: Is nothing less than polite, friendly, and smiling as she plots how to instigate the Final Killing Game with Monaca.
- The Chessmaster: Her plotting is on Izuru's level. She helps Class 77 get in the Neo World Program, then turns around and exposes the plan to Kyosuke with the goal of getting him to put Makoto on trial. Having subtly influenced Tengan into starting the Final Killing Game, she then invites Monaca to partake in it to further spread confusion, with her ultimate goal being to eliminate every other branch head and drive Kyosuke to despair. And for the most part, it works.
- Greater-Scope Villain: Chisa is revealed to be responsible for basically the entirety of Side:Future. She helped Class 77 infiltrate the Neo World Program, exposed Makoto's role in hiding Class 77 to Kyosuke, and then enabled Monaca's murder of Miaya and presence in the Final Killing Game. Not only that, she had a hand in Chiaki's torture in the first place, making her indirectly responsible for the repercussions on her psyche as well.
- The Mole: Is really a Remnant of Despair.
- Morality Chain: Exploited. She knows Kyosuke listens to her, so she manipulates her hold over him to push him into doing actions she wants.
- Parental Substitute: Chiaki loved her like a mother, making her betrayal hit extra hard.
- Walking Spoiler: Being a mole isn't the spoiler. It's what she does as a mole that is.
The Ultimate Lucky Student of Class-77, a young man obsessed with hope. Due to his luck working in extreme cycles of good-bad, he is constantly in the middle of unbelievable circumstances.
- Blue-and-Orange Morality: Is a true believer in the power of hope and any despair being acceptable if for hope's sake. For example, he thinks Chiaki's Tragic Mistake is okay because everything turned out alright in the end. She quickly refutes that.
- Heroic Self-Deprecation: He puts himself down as trash often, and overall has a very low opinion of himself. In fact, he considers himself so unworthy, he doesn't even want to be in therapy because he thinks it's taking time away from the others! Chiaki and Class 77 try to reassure him otherwise, but it's clearly something that will take a lot of time for him to overcome.
- Ill Boy: During the classes' cameos as Ultimate Despair, he's sick and delirious with a fever.
- Love Freak: To say he loves hope would be an understatement.
- No Social Skills: He's pretty blind about social conventions. Even when he tries to comfort someone, his particular idea of comfort is too bizarre to really help, and he hasn't apologized to Chiaki F. for getting her killed—not because he's being rude, as some would think, but because he just genuinely hasn't thought of it. Chapter 9 of Expansion Pack shows that he's working through this in therapy.
- Pet the Dog: He picks up that Chiaki F. is going through an existential crisis and comparing herself to Chiaki N., and tries to comfort her. His mindset makes it more confusing than helpful, but she appreciates the thought.
- The Pollyanna: He's constantly cheerful no matter what despair or misfortune awaits him, to the incredulity of his classmates.
Shy, nervous, and self-deprecating, yet greatly skilled as the Ultimate Nurse. She often injures herself tripping, which she does as a secret way of getting attention.
- And I Must Scream: She makes it clear she was perfectly aware of what she did to Chiaki, but couldn't stop herself.
- Apologizes a Lot: She'd apologize for existing, depressingly enough, if she thought she had to.
- Cute Clumsy Girl: Deliberately invoked and deconstructed. Mikan trips so much because she's acting out for attention; in her book, humiliating herself is better than being ignored.
- Desperately Craves Affection: Deconstructed. Mikan has been abused all her life, leaving her with a desperate desire to be loved by people. In the absence of that, she'll settle for any kind of attention, even cruelness or humility. The result has made her a miserable Extreme Doormat who hates the way she's treated, but still finds it preferable to being ignored.
- Grew a Spine: She finally stands up for herself to Hiyoko in Chapter 5 of Expansion Pack. It backfires and the bullying redoubles, and she backs down quickly; however, by the end of the chapter, she's able to do it a few more times. She's trying, bless her.
- Manipulative Bitch: As Ultimate Despair, Mikan would put on acts of either helplessness or compassion to lure her victims into traps.
- Nervous Wreck: She's constantly anxious and worried about other people ignoring her. It ends up driving her to a panic attack when Hiyoko's bullying goes too far.
- Shrinking Violet: She's timid to the bone.
- Yandere: While Ultimate Despair, for Junko. The scene of her holding and stroking Nagito's Junko-hand, while blushing, says it all. After being freed from her brainwashing, however, Mikan holds nothing but hatred for her.
A young man who completely lacks a name, family, and personal history. He lives by stealing the identities of others, and is able to perfectly mimic their appearance, voice, and even talent.
- Master of Disguise: This is his entire talent, and he's extremely good at it. Even knowing about it and arriving with the real Byakuya, when she meets the Remnants, Kyoko has to actively remind herself she's just speaking to an imposter.
- Number Two: He refers to himself as Izuru's lieutenant, of sorts, while Ultimate Despair, since the latter prefers not interacting with the others.
- OOC Is Serious Business: He's normally calm and kind, which makes it all the more jarring when he yells at Hiyoko for pushing Mikan into a panic attack.
- Spell My Name with a "The": Hes always called the Ultimate Imposter, or sometimes just "the Imposter". Mikan calls him "Imposter-san", but thats only when speaking to him, not referring to him.
An excitable and energetic woman, the Ultimate Musician. She used to be the guitarist in a popular girls band, but left because of creative differences.
- Genki Girl: As usual, Ibuki has a lot of energy.
- The Insomniac: She mentions having a lot of trouble sleeping in the final chapter of Extra Life, due to seeing her crimes play out behind her eyelids.
- Nice Girl: She instantly, and with no holds barred, forgives Mikan for murdering her in the second game. When Mikan tearfully offers to be humiliated in exchange for the forgiveness, a shocked Ibuki exclaims that's not what she wants at all.
- The Nicknamer: To differentiate between the Chiakis, she uses "Nana-chan" for the human, and "Saki-chan" for the AI, based off their surnames.
- Perky Goth: She looks scary, with her piercings and dyed hair, but is a peppy, happy sweetheart.
- Shipper on Deck:
- She catches Hajime and Chiaki being on First-Name Basis right away at the reunion, and squeals in delight.
- She also wonders what'd happen if the World Destroyer hooked up with AI Chiaki.
- Stepford Smiler: Like a lot of Class 77. Despite how perky she is, she's clearly affected by her time as Ultimate Despair, if her admission she can't sleep at night is anything to go by.
The Ultimate Yakuza and heir of the Kuzuryu Clan, Japans largest crime syndicate. Short in stature and temper. Despite his fearful reputation, he has a moral good and a good heart.
- Jerk with a Heart of Gold: He's got a short temper, a foul mouth, and outright threatens Hajime when he thinks Chiaki being alive is a joke. However, if he's concerned about his friends, he will try to do something to help. He's also a supportive and loving boyfriend.
- Let's Wait a While: Non-sexual version. He and Peko take the better part of a year to become a couple because they both want her to discover who she is outside of her relation to him.
- Sir Swears-a-Lot: A lot of his sentences have some kind of curse in them, and he also drops the first "fuck" in Extra Life.
- Understanding Boyfriend: He's 100% understanding of Peko needing time to discover herself, actively encourages it, and lets her set the pace in their relationship because he doesn't want to force her into anything.
- Victorious Childhood Friend: With Peko.
Fuyuhikos hitwoman and childhood friend, shes the Ultimate Swordswoman, said to be unrivaled with a blade. Due to her upbringing, she sees herself as just a tool. Her stoic and taciturn demeanor masks a secret love of fluffy animals.
The foreign Ultimate Princess from the country of Novoselic. She is kind and dignified, but has a strange side because of her eager fascination with Japan, the occult, and serial killers.
- Beneath the Mask: Invoked and lampshaded. Kazuichi is shocked to learn of her longing for Novoselic and why she visits Jabberwock's military base...because he never bothered to check if she was wearing a mask in the first place.
- Cuteness Proximity: Breaks into coos when she sees the Four Dark Devas of Destruction.
- God Save Us from the Queen!: Her time as Ultimate Despair was this, with Sonia turning weapons on other countries for the heck of it. If her citizens protested, she turned the weapons on them too. Chapter 10 of Expansion Pack also mentions she did things like bazooka hospitals.
- I Just Want to Be Normal: Sonia had to bear the burden of being the perfect crown princess in her own country, and never got the chance to be a normal girl. As such, she was really hoping for the chance to be just a regular high school student when she started attending Hope's Peak.
- Nice Girl: Even when she rejects Kazuichi and calls him on stalking her, she does so in a rather polite way.
- Nightmare Fetishist: She enjoys the occult, reads about serial killers, and takes a liking to the horror genre of video games.
- Official Couple: With Gundham.
- Self-Made Orphan: Chapter 10 of Expansion Pack reveals she tortured her parents to death. It still haunts her.
- Stepford Smiler: She deeply misses Novoselic and visits the military base because it's the closest reminder she has to home. She's also afraid that revealing the true details of what she did as Ultimate Despair will drive her friends away from her. Despite that, she tries to keep up her kind and cheerful demeanor.
- Warrior Princess: She's implied to have fought off assassins personally while Ultimate Despair, and is familiar with military weapons and tactics.
- You Can't Go Home Again: Is hit twice over with this. Like the rest of her class, she's exiled from society; however, she's not Japanese, so she's exiled into a foreign country on top of that.
The eccentric Ultimate Breeder, who acts like an eighth grader by proclaiming himself to be a supreme overlord, among other things. However, he is very gentle and loving when it comes to animals.
- Antiquated Linguistics: He speaks in a way more similar to a medieval fantasy overlord than a modern 20-something.
- The Beastmaster: While Ultimate Despair. Kyoko mentions he usually has an animal army around to command, and the lack of their presence is a sign in favor of the Remnants' call for help not being a trap.
- Black Magic: Claims to have dark, supernatural powers.
- Chuunibyou: Acts like one, claiming to have superpowers, pretending to be an evil overlord, and speaking in Antiquated Linguistics. He also dresses in a dark and extravagant fashion, and his dream world, which the World Destroyer visits, is where he's literally the ruler of the world.
- Friend to All Living Things: He loves animals, and is running the ranch on Jabberwock.
- Hates Being Touched: Gundham already had issues with this before becoming Ultimate Despair. Now he's even worse about letting people touch him. He makes an exception for Sonia, but even then he's still hesitant.
- Large Ham: Gundham wouldn't be Gundham if he wasn't overly dramatic.
- Official Couple: With Sonia.
The Ultimate Mechanic, who uses flashiness to hide his true, cowardly personality. Has an unrequited crush on Sonia.
- Abhorrent Admirer: To Sonia, not in terms of looks but in terms of behavior. She eventually straight-up tells him that she doesn't appreciate the way he treats her, driving him to a Heroic BSoD.
- Heterosexual Life-Partners: With Hajime, who he calls his "soul friend" and "bro".
- Hopeless Suitor: To Sonia, who not only doesn't enjoy his behavior, but hooks up with Gundham. Having to accept this is part of his Character Development, in fact.
- Jerk with a Heart of Gold: He's irritable when stressed, openly jealous of Gundham's relationship with Sonia, and creepily obsessed with Sonia herself. At the same time, he's appreciative of the friendships he's made and apologizes to Hajime, Chiaki, and Fuyuhiko for snapping at them. By the end of Chapter 4 in Expansion Pack, he's also accepted the fact Sonia isn't interested in him and plans to respect that.
- Loving a Shadow: He admits at the end of Expansion Pack that he placed Sonia on a pedestal, based off his dream of dating a blonde lady, and didn't take the effort to know her.
- Moment Killer:
- Played for Laughs at the end of Extra Life; he throws a volleyball at Hajime (who easily catches it) when he and Chiaki start making out in public.
- Played more seriously in Chapter 4 of Expansion Pack, when he crashes Hajime and Chiaki's date to yell at the former for not telling him Gundham and Sonia were going out.
- Mood-Swinger: During his chapter of Expansion Pack, due to his stress over Sonia and Gundham's Relationship Upgrade.
- Stalker with a Crush: He knows Sonia's exact schedule around Jabberwock Island, and considering his canon behavior, that's the least of the stalking.
An acrobat and athlete who far prefers fighting and eating to either of those activities. She loses interest in things she doesnt get very quickly.
- Big Eater: She gives an enthusiastic "HELL YEAH! MORE FOOD!" when Class 77 plans a celebration for Chiaki's return.
- Book Dumb: She doesn't understand the World Destroyer's 'techno jazz', and asks for a simplified version.
- Hidden Depths: She's surprisingly good at hairstyling. It comes from her experience with doing her younger sisters' hair.
- Logic Bomb: She tells Chiaki that she'll punch her if she's a ghost, which would be pretty difficult considering the nature of ghosts.
The Ultimate Team Manager who, despite his muscular build, would rather help others succeed in sports. In part this is because of a heart defect, but he maintains a lively personality despite that.
- Boisterous Bruiser: He's loud, friendly, and loves a good fight.
- Ill Boy: He was born with a congenial heart defect that prevents him from playing sports, which the World Destroyer mentions as one of the things gone in Nekomaru's dream world.
- Large Ham: Nekomaru doesn't talk, he booms.
- No Indoor Voice: 'Quiet' is an adjective that certainly does not apply to him.
- Toilet Humor: His 'advice' to Ibuki, for falling asleep, is that she should eat as much as she can and then take a good shit before bed.
A level-headed photographer, famous for taking pictures of peoples smiles. Shes good at looking after her classmates, but tends to be harder on the boys.
- Moral Myopia: Addressed and subverted. She admits she was wrong to defend Hiyoko from bullying, but not Mikan, and starts crying while trying to apologize to the latter.
- My God, What Have I Done?: After Mikan has a panic attack from Hiyoko's bullying, Mahiru becomes deeply ashamed of never standing up for her.
- Team Mom: She looks after everyone's wellbeing. Kazuichi even compares her to a no-nonsense mother.
The Ultimate Traditional Dancer and heiress of the Saionji clan. She was once popular for her child-like figure, but had a growth spurt. Sadly, it did nothing to change her cruel nature.
The Ultimate Cook whose passion for sex matches his passion for food. He acts like a suave ladies man and cool city-dweller, but is really a mamas boy from the country.
- A Threesome Is Hot: He's pretty disappointed to learn that Hajime and Chiaki are not open to harem routes with their A.I.s.
- Accent Slip Up: He slides back into his country drawl from shock at the reunion with Chiaki.
- All Men Are Perverts: He's an adult now, but just as hormonal and sex-addicted as he was as a teenager. The World Destroyer mentions that he had to filter out a lot of erotic fantasies while diving through Teruteru's mind.
- Anything That Moves: He makes a pass at a 2D artificial intelligence.
Ultimate Despair and the Big Bad
, a world-famous supermodel and fashionista who desires nothing more to cause The End of the World as We Know It
...and succeeds. Having tortured Chiaki almost to death, both protagonists hold a grudge against her.
- The Bad Guy Wins: She succeeds in causing The Tragedy only three chapters into the fic.
- Hope Crusher: Hope is a natural anathema to her. Not only does she want to crush it for her success, she actively loves doing so.
- Offscreen Villainy: An odd, inverted example. She herself is offscreen for much of the fic, as Izuru breaks contact with her as soon as the Tragedy starts, but her villainy's impact is very much seen on the world.
- Villainous Legacy: She's not around for much of the fic and dies in her third appearance, but her influence and actions have huge consequences on the world. On a more personal level, her run-in with Chiaki left her with mental scars, and Izuru regards her as his worst enemy.
Leon's cousin, an escaped Captive of Towa City who was rescued by Future Foundation. She is taken to Chiaki as her first therapy patient.
- Broken Bird: Her experiences and loss have left her inwardly believing no one would genuinely want to be her friend and that revenge is all she has left to live for.
- Revenge: She holds a serious grudge against Future Foundation. The only reasons she doesn't carry it out are her friendship with Yasuhiro and just plain not having anywhere else to go.
- Sole Survivor: Her parents were murdered while she was held captive and Leon died in the Killing School Life. It's not known what happened to Leon's parents, but Kanon heavily implies they're dead, too.
- Sour Outside, Sad Inside: Makes a lot of sarcastic and derogatory remarks, but it's a defensive mechanism against her pent-up depression over her family's deaths and her guilt for attempting to kill Yasuhiro.
- Yandere: Deconstructed; her obsession with Leon is portrayed as very negative for her mental and emotional health, and is the primary root of nearly all her personal issues.
The World Destroyer
An artificial intelligence created by and modeled after the merged Hajime and Izuru. Despite his intimidating name, he was designed to rescue the comatose students of Class 77.
- Ascended Extra: He has about fifteen minutes of screentime in a Japanese-only OVA. Here, he gets a surprise appearance at the end of Extra Life and his own lengthy chapter in Expansion Pack.
- Benevolent A.I.: He is an artificial intelligence created to rescue the comatose students of Class 77, and thats exactly what he does, no qualms about it. While it could be argued (at least the World Destroyer would) that his benevolence is only programmed into him, Class 77 believes he can develop beyond what he was created as. It's hinted that he can, as he starts to find genuine happiness in helping people, like cheering Chiaki up.
- Dark Is Not Evil: He wears all black and has bright red eyes, but is firmly a good guy.
- Deathbringer the Adorable: His name is the World Destroyer...and hes an AI whose primary purpose is therapy and restoration. Ibuki slapping the cutesy "-chan" honorific onto his scary name also gives the same impression.
- The Dutiful Son: 'Son' is an exaggeration, as neither refers to the other in a familial manner, but he is a creation of Hajime's. The Word Destroyer is only concerned with carrying out his duty to Hajime and Class 77 as best he can, no matter how hard it is or how long it may take.
- Humble Hero: Doesn't feel he should be thanked for saving Class 77 because he was just doing his job.
- Last Episode, New Character: He doesn't show up, or even get mentioned, until the final chapter of Extra Life. But to be fair, he didn't exist for most of the fic.
- Like Father, Like Son: Just in case you had any doubts on who created him, the World Destroyer is as serious and expressionless as Izuru. Since his creator had a Split-Personality Merge for the better by that point, though, he's tempered by Hajime's empathy and values hope highly.
- The Philosopher: He and Chiaki F. have several conversations on what constitutes personhood and whether they're really alive. They come to the conclusion that they are, and even if they weren't, their friends think they are. That's enough for them.
- Robot Boy: Kazuichi builds robot bodies for the A.I.s; Usami declines and Alter Ego can't leave, but he and Chiaki F. accept, and are able to enter the outside world to be with their friends.
- Spell My Name with a "The": Ibuki shortens his name to "Destroyer-chan", but other than that, hes always addressed as "the World Destroyer".
- The Stoic: Hes always calm and never lets emotion influence him, or even shows them.
- Undying Loyalty: To Hajime, his "Creator". It doesn't even occur to him to question his judgment.
- Walking Spoiler: His mere existence is this, given the lateness of his appearance.
- What Measure Is a Non-Human?: Holds this attitude towards himself. The World Destroyer views A.I.s, himself included, as tools to be used by humans. Everyone else argues otherwise, with Hajime and Mahiru specifically bringing up how Chiaki's AI exhibited the capacity for change like a regular person.
Also known as AI Chiaki. She's rebuilt over a year after the end of the Killing School Trip, in Expansion Pack
, and changes her surname to avoid confusion.
- Cloudcuckoolander: A prime difference between her and Chiaki N.? She gets lost in her head a lot more, so her narration is spacier.
- Due to the Dead: To avoid the problem of having the same first and last name as the protagonist, she takes the surname "Fujisaki" to honor her father.
- Fish out of Temporal Water: Downplayed. She was rebooted in the same generation as her friends, but finds the differences between the ones she knew and the ones who've had over a year to grow dizzying.
- Gamer Girl: She's based off the original Ultimate Gamer; of course she loves games. She decides, though, that her love of games is hers and not just something she was programmed with.
- Nice Girl: While she feels pushed aside by Chiaki N. and lost with her friends having grown up, she doesn't let it affect her relationship with them. She just continues being the same kind person she always was.
- The Philosopher: She and the World Destroyer have several conversations on what constitutes personhood and whether they're really alive. They come to the conclusion that they are, and even if they weren't, their friends think they are. That's enough for them.
- Replacement Goldfish: She struggles with feelings like this; her nature was to be a blank-slate that would become Class 77's ideal person, and the one they had in mind was the class rep they thought dead. As if having the appearance, personality, and name of another girl so she could be her substitute wasn't enough, she's revived to find that said girl is still alive and with everyone.
- Robot Girl: Kazuichi builds robot bodies for the A.I.s; Usami declines and Alter Ego can't leave the Neo World Program, but she and the World Destroyer accept, and are able to enter the outside world to be with their friends.
- Sleepyhead: She doesn't doze off as much as she used to, but still has and enjoys a good nap.
- Verbal Tic: She ends her sentences with "I think", a difference from Chiaki N.