Dogged Nice Girl: To Arashi. She is deeply in love with him and keeps hoping that he might return her feelings, even if she never says it aloud.
Extreme Doormat: She can't stand up for herself at all and is quick to apologize for things that aren't her fault. Very frequently, she also says what she thinks others want to hear, rather than her true opinion.
Friendless Background: In the few flashbacks we see of her past life, she has stopped going to school because she's being bullied there. Her only friend seems to be the cat Macadamia Nuts.
Green-Eyed Monster: She's jealous of Hana, because she eventually falls in love with her boyfriend Arashi.
Hikkikomori: She stopped going to school because she was bullied and spent most of her days at home, not going outside.
I Want My Beloved to Be Happy: When she finds a letter that proves that Hana is still alive, she initially hides it because she doesn't want Arashi to reunite with her. Thanks to Botan, however, she realizes that the mark of true love is selflessness, so she returns the letter and starts supporting Arashi's relationship with Hana, even if it means abandoning any chance of ever being with him.
Kind Hearted Cat Lover: She has a beloved pet cat and also admits that she hates Robinson Cruso because he drowned kittens at one point in the novel.
No Periods, Period: Averted. During the Minor Heat arc, she gets her period. It even becomes plot-relevant, when iron eating bacteria start chasing her because of her blood.
Oblivious to Love: She doesn't realize that Semimaru falls for her until he pretty much tells her. Justified, since she has some problems with social behavior and difficulty reading people.
Shrinking Violet: Painfully shy, insecure, unable to stand up for herself and very withdrawn describes her perfectly.
Stepford Smiler: She frequently hides her dislike for others or takes their abuse because she is too afraid of standing up to them and also frequently thinks that she will be disliked for expressing negative emotions.
The Nicknamer: She's good with thinking up names for new plants, animals etc.
A kind and considerate seventeen-year-old who protects Natsu from Semimaru's bullying. The most important person in his life is his girlfriend Hana and he hopes to find her alive in the post-apocalyptic world. He's an excellent swimmer.
Sensitive Guy and Manly Man: Sensitive guy towards Semimaru's manly man. Arashi is sweet, gentle, forgiving and wants to see the good in everyone, while Semimaru is abrasive, cynical and frequently a big jerk.
Shipper on Deck: It's later on implied that he wouldn't mind it if Natsu and Semimaru became a couple.
A rude and selfish eighteen-year-old deliquent with a bad homelife. He loves to pick on Natsu.
Anger Born of Worry: In the Minor Heat arc, Arashi gets separated from the group and they fear that he might be dead. As soon as he reunites with them, Semimaru proceeds to beat him up while yelling how worried he made them. Semimaru's first words towards Natsu after he meets her again are also angry scolding for getting separated from the group.
Book Dumb: He doesn't even know what Photosynthesis is.
Don't You Dare Pity Me!: When he suspects that Arashi and Natsu might pity him for mourning his mother's death, he gets incredibly angry.
Everyone Can See It: Let's see… Hibari, Chimaki, Arashi, Hotaru and most recently Matsuri have all demonstrated in various ways that they're aware of Semimaru's feelings for Natsu.
Fiery Red Head: He has red hair and is easily angered, and even besides that, loud emotional outbursts are his usual way of communicating.
Genki Guy: While he does have his quieter moments, most of the time, he is very upbeat, talkative and energetic.
Green-Eyed Monster: Once he notices that Natsu has a crush on Ango he gets angry whenever he gets protective of Natsu or keeps her close to him.
Hidden Depths: Over time. Who knew the guy could cook or could be a Stealth Mentor big bro? He also shows himself suprsingly knowledgeable about people and ends up saying some very insightful things about human nature in general.
Hot-Blooded: Among Team Summer B, he is easily the most temperamental member.
Jerkass—> Jerk with a Heart of Gold: He starts out as rude, abrasive and even abusive and threatening to almost everyone. However, once he notices that his behavior has only led to others disliking and avoiding him, he eases up on that. When he comes to care about Arashi and Natsu, he becomes increasingly affectionate and protective towards them, and is mostly mean in playful ways.
No Indoor Voice: Loudly talking or outright shouting is his "normal" way of talking.
No Sense of Personal Space: Even if he has just met someone, he is quick to touch him/her, especially by putting his arm around him/her.
Peek-a-Bangs: His right eye is somewhat obscured by his bangs.
Sensitive Guy and Manly Man: Manly man to Arashi's sensitive guy. Arashi is sweet, gentle, forgiving and wants to see the good in everyone, while Semimaru is abrasive, cynical and frequently a big jerk.
Son of a Whore: Semimaru's mother was a prostitute, which led to him being bullied by his peers.
Supreme Chef: During his stay in the future, he tries to pay a tribute to his dead mother by cooking the stew she would sometimes make him. This leads him towards discovering his passion for cooking.
The Bully—> Loving Bully: Towards Natsu. At first, he bullies her because she is an easy target, but later on, he does it both to cover up his feelings for her and to toughen her up.
Tsundere: Initially type A towards both Arashi and Natsu, but he later becomes type B towards Arashi. In the beginning, he is very abrasive and rude towards both of them, but as Arashi gains his trust and respect, Semimaru becomes very affectionate and laid-back around him, and only occasionally beats him up when Arashi really angers him. Meanwhile, as Semimaru starts falling for Natsu, his bullying gradually becomes a defensive mechanism - unwilling to face his attraction to her, he ruins any tender moment between them by picking on her.
Weaksauce Weakness: He fears bugs, and to a lesser extent dogs. He also seems to hate Darkness.
She's the guide of Team Summer B and has an outspoken and confident personality. In the past she was a policewoman.
Anime Hair: When first introduced, she has the most unusual hairstyle of the series, involving several narrow braids, some of which stick up rather improbably.
Badass: One example of her approach to life: Her team members are being menaced by crocodiles. Botan tackles one of the crocs to give the others a chance to escape. She does get hurt in the process, but still.
Badass in Distress: When gets stuck in that cave together with the some other members of Summer B.
Expository Hairstyle Change: In flashbacks of her time as a police officer, wears a Prim and Proper Bun. When she's first introduced as the rather intimidating guide of Team Summer B, she wears the style described above under Anime Hair. And later, when the team members know her well enough to see her as a Cool Big Sis, she wears a softer raised ponytail style.
Fair Cop: She used to be a policewoman before she joined the 7 Seeds project.
The Pig Pen: It's implied that he doesn't pay a whole lot of attention to his personal hygiene, more focused on his painting, and only cleans himself every other day or so.
The Quiet One: He doesn't spend a lot of time talking with his teammates, preferring to spend his time mixing paints, or drawing on any available surface.
The Smart Guy: He doesn't talk a whole lot, but he is very observant and was the one to come up with an idea on how to free their ship from clingy algea that was keeping it stationary.
Mozu / Kaname Mozunoto
A mysterious person who keeps his distance from the rest of Team Summer B and periodically disappears from the group. He was actually involved in training Team Summer A, and was put in cryostasis a few years after they were. He seems to be the last remaining person who was involved in setting up the 7 Seeds project.
Big Brother Mentor: Especially towards Ango: "He doesn't come across as a teacher, but as someone who looks after us..." (...) "I have a feeling that he favors me a little."
Meaningful Name: "Butcher-bird." Besides his role as the "death god", he was also involved in the deaths of the many failed candidates for Team Summer A.
Pet the Dog: Even though it was against the rules, he kept quiet about Ango secretly training Shigeru and even prepared food for their trip.
Oddly Visible Eyebrows: His eyes and eyebrows are briefly visible through his baseball cap visor at one point.
Odd Name Out: His name does not contain a summer reference, unlike the rest of the team.
Ill Girl: She contracts a disease that gives her a terribly spreading rash that is said to be fatal, she gets cured after taking baths in salt water for a period of time.
Locked Out of the Loop: While this is true of most of the characters, who weren't told about the Seven Seeds Project until they woke up from cryostasis, Hana was also kept in the dark about her parents' roles.
Morality Pet: To her father, and to a lesser extent, also to Kaname Mozunoto.
Never Found the Body: She got sucked into a whirlpool in an ice-cold river and was presumed dead. Subverted, as she didn't die.
A young girl who remains asleep for some time after the others awaken from cryostasis.
Blush Stickers: She sports them sometimes, but not as often as Hotaru.
The Ojou: She comes from the main branch of a very wealthy family who backed the project, and is accustomed to being treated with respect and deference. At one point, Mozu even refers to her as a princess.
The Load: Early on when she's asleep and therefore can't exactly contribute anything to the team.
Arranged Marriage: Her grandfather arranged a marriage between her and a protege of his Akio Haza of Team Autumn. Chisa has shown no inclination to go through with it, and her only reaction to learning that Akio is among the survivors is an exasperated "That man!" directed at her grandfather.
Harmful to Minors: Their upbringing wasn't exactly pleasant, especially for the ones who realized that those who "left" the program were actually being killed- but the Final Test (when they were seventeen) was horrific.
The Exile: As punishment for their crimes, he and Ryo are given the choice between exile from the Spring/Autumn/Summer A group and lifetime penal servitude. They choose the former... and are surprised when the rest of Summer A declines to come with them.
Not So Different: (To Ango:) "You're cut from the same cloth as I am, so maybe you'll make it."
Later on, both of them are Not So Different from the teachers at the institute. Ryou even leaves cards behind while "testing" the members of Summer B.
Oblivious to Love: He doesn't quite understand it when Matsuri confesses she likes him and wants him to go out with her... until he mentions that if she means having children with him, in which case they'll have to wait until things settle down.
The Exile: Along with Ango, he's exiled from the Spring/Autumn/Winter village- in his case, for trying to murder two people.
The Rival: During their childhood at the institute, he and Ango fight for the top rank all the time, especially when they end up taking the same special classes.
The Stoic: 90 percent of the time, his face is an impassive mask which betrays nothing of his feelings and thoughts, and even if he expression does change, it is usually pretty subtle.
Not So Stoic: When he does snap at someone, it's actually quite frightening - he's surprised himself.
Through His Stomach: It's implied he has a crush on Koruri because she always gave him large helpings when she was on kitchen duty.
Troubled, but Cute: As a child he constantly broke the rules at the institute and as an adult, he does not hesitate to achieve his goals with murder and yet, he's still quiet popular with the ladies in-universe.
Beware the Nice Ones: She's one of the nicer Summer A members, but she's also the first to draw a gun on Unami when her team wakes up in the future.
Cordon Bleugh Chef: Ango thinks that the food she cooks is always too salty and the bread she bakes too hard.
The Cutie —> Break the Cutie: She's a nice, cheerful, generally well-liked kid. Then come the Final Test, Mayu's death, and finally learning of Nobara's... She's the first to draw a gun on Unami when the team wakes up in the future.
Genki Girl: As a child, she was upbeat and cheerful most of the time, but after the traumatic events of the final test she becomes quiet and withdrawn.
Younger Than They Look: She's seventeen, like the rest of her teammates; however, she looks younger, to the point where Haru is shocked to find out her real age.
Berserk Button: Rape. "It’s just that... I really... truly... abhor that sort of thing... so much that it makes me want to rip him [Ango] to shreds."
Beware the Nice Ones: Debateable if you can actually call her one of the nicer ones of Team Summer A, but she certainly acted very kind and gentle towards Nobita when she was actually using him as a guinea pig to check the edibility of unfamiliar plants.
Broken Bird: She hates most other people and is distrustful of them. On top of that, she also feels massively guilty for letting her bullies die.
Darwinist Desire: Ayu wants to "secure" Aramaki as her future mate, since she believes that he is a good specimen and would be able to create strong and superior offspring with her.
Defrosting Ice Queen: In the latest arc. Thanks to meeting Aramaki, she regains her trust in people and reexamines some of her worldviews.
Dissonant Serenity: She remains calm even in horrifying and ridiculous situations. In truth, though, she certainly does feel those things. She just never shows it.
Murder By Inaction: Her bullies force her to make dinner for them during the Final Test, then refuse to give her chopsticks... which they made out of wood that she recognized as a poisonous species. She explains their mistake only when one of them, dying, accuses her of poisoning them.
Friend to All Living Things: He loves animals of all kinds, and was top in the animal classes. He's hit very hard by having to Mercy Kill animals he raised during the Final Test- a rabid tiger and several animals that were not native to the area and would not have survived long.
Emotionless Girl: Hardly ever shows emotion, even when half her teammates are experiencing Heroic BSOD; she also wasn't visibly upset when her old ally and sort-of-boyfriend Ryo was exiled from their community. The most she ever shows is an occasional faint smile.
He Is Not My Boyfriend: Many characters assume she is dating Ryo, but when Matsuri first meets her and asks if this is the case, she calmly denies it and says she thinks that Ryo has a crush on Koruri.
The Stoic: She is probably the most reserved and controlled female character in the whole manga. Even immediately after the final test, she retains her composure to ask some pointed questions.
Bad Liar: Ayu asked him to keep her discovery of Nobita a secret, but Ban lied so poorly that Ango knew something was going on.
Blinding Bangs: A mass of curly hair covers the upper part of his face, and his eyes have never been shown. This serves to emphasize his shyness.
Break the Cutie: He's a kind person who enrolled in the medical class because he wanted to help others. He's very hard hit when he realizes that his medical training won't allow him to save every injured person.
Informed Attribute: He's part of Koruri's "saucer-eyes club", but of course, his eyes are never seen.
Murder By Inaction: While he's the only one to not pull a gun on Unami when they awaken in the future, he does let him bleed out slowly because, according to him, his "abilities are limited".
The Medic: Was the best in the medical classes, and is now effectively the doctor for the new village. However, he also suffers some Angst about his abilities- first because of the people he failed to save during the Final Test, and later because he finds out that his medical training is almost two decades out of date.
Nice Guy: He's kind and sweet, and is the only member of his team who's never killed anyone.
Asshole Victim: He has repeatedly sexually harassed Koruri and tormented the students along with the other teachers.
Dying Alone: The Summer A team members shoot him fatally, then leave him to die alone as they leave the cryonics facility.
Jerk Ass: Physically and sexually abusive, misogynistic and completely lacking in empathy are his most outstanding character traits.
Too Dumb to Live: His behavior on awakening. He starts trying to boss around a group of traumatized seventeen-year-olds with guns, none of whom have any reason to like him... and one of whom threatened to kill him immediately before cryostasis.
Broken Pedestal: They've manage to set up a functional community. Although it's quickly shown that this came at the price of reducing much of the team into glorified slaves. And it's also revealed that neither Ran or Akio give a damn about rebuilding Japan.
Mandatory Motherhood: Inverted. On learning that the teams were not given any contraceptives (implying that the people who set up the project were trying to enforce this trope), the leaders of the team made a ban on any sex that could lead to pregnancy.
Ruling Couple: Akio and Ran. Despite their abusive behavior, all of Team Autumn obeys them.
The Social Darwinist: The modus operandi of the team is essentially "backbreaking toil or death." Or at least that's what Ran and Akio convinced themselves.
Meaningful Name: Another word for Autumn is "Fall." Which can just as well refer to how the Team turned out after a few years.
Last Name Basis: Because he dislikes his first name, he's one of the few characters to be addressed by their surname.
Take a Third Option: Interrupts Ran and Nijiko's lengthy argument about how to transport water to the settlement by suggesting that maybe they should build a new base closer to the new source of water.
The Atoner: In his second appearance, he's trying to make up for trying to poison his teammates.
Dead Guy Junior: He names two of his dogs after Fubuki and Mitsuru, although he uses the -san honorific with the latter.
Doesn't Like Guns: When Ango aims a gun at him, Aramaki angrily asks how long he plans to rely on the gun and tells him that keeping on holding it means that he doesn't understand the value of life or human pain and suffering.
Heroes Love Dogs: It's what kept him from going insane after wandering Japan alone for 15 years.
Tragic Bromance: With Takahiro. Before coming to the future, they had heard of each other but never met; when they met, they quickly became close friends, with Takahiro particularly admiring and relying on Fubuki. Then Fubuki dies, leaving the other two on their own and beginning the tragic end phase of Team Winter's story.
Belligerent Sexual Tension: With Fubuki. At first they bicker and butt heads constantly, but gradually it becomes clear that they have feelings for each other.
"Oh! If it's a man it's self-confidence, but if it's a woman it's arrogance, huh? That's a pretty one-sided view of things."
Driven to Suicide: After Fubuki's death, she puts on her old costume and dances the same dance that she failed to master before going into cryostasis because she did not understand grief at the time. She does this during a snowstorm, and freezes to death.
Raven Hair, Ivory Skin: She has the coloring and is considered very beautiful, both by the boys on her team and her admirers in the past.
Did They or Didn't They?: It's all but clear that towards the end, Mark and Maria were a couple in all but name. Although it's also hinted that Mark had sex with her, which he seems to deny in the journal. He mentions when they began sharing a bed, and refuses to elaborate further. Imagery seems to indicate, though, that they did.
Doesn't Like Guns: The official policy of the shelter seems to be the complete lack (or at least heavily restricted use) of firearms. Which actually becomes a plot point later on, when compared to the manned Fuji ship that did have a veritable arsenal of weapons...withunfortunateresults.
Everybody's Dead, Dave: Their deaths reinforce that yes, the five teams are really the only survivors of the apocalypse (at least so far).
Face Death with Dignity: The vast majority of the shelter's inhabitants remained brave and cheerful even after they knew that death was inevitable.
Book Ends: His story begins and ends with the final words in the journal: "I can't...anymore..." They take on a different meaning by the time it ends however.
Cat Smile: Mark is generally drawn with one, even if he isn't really smiling.
Chekhov's Gun: His seemingly light-hearted decision to leave the lights on for the plants saves Hana and the others long after his death.
Chekhov's Skill: As part of his act, he will occasionally "switch" with his puppet Pete, so that he speaks with Pete's voice and mannerisms and the puppet seems to speak with his. Later on, when the Acari X try to prevent him from killing himself, he does this again so that "Pete" can go through with it.
Cloudcuckoolander: No, talking as if his puppet is alive isn't entirely part of the act.
Consummate Liar: Takashi chose him to be one of the shelter's entertainers because he felt Mark was the best liar, and would be able to keep performing until the end... even for people he knows are about to be murdered so that the rest have a chance at survival.
Creepy Doll: There's nothing actually weird about Pete, but his appearance can be a bit... unsettling with his half-closed eyes.
Perpetual Smiler: As part of his act, although it also reflects his actual personality. It does slip eventually, but only when things get very bad.
The Pollyanna: Capable of seeing a bright side even when the shelter's population has been infected by Acari X, everyone else has either died of the infection or killed themselves to prevent it from spreading, and he (the last person alive there) is about to do the same:
“There’s only one last thing I would like to say... What we experienced was not ill fate. We lived... we laughed... we spent our last days with the people we cherished... That is not something one would call misfortune.”
Shaggy Dog Story: He writes down the story of the shelter, which was supposed to be a Hope Spot for the people after the meteorites hit the earth, but things just keep getting worse and worse, turning it into a place of tragedy, with Mark finally committing suicide.
Ventriloquism: He's a professional ventriloquist. Usually he makes his puppet talk, but he advances his abilities to have other inanimate objects talk including a coffee mug, a slice of pizza as well as dolls and stuffed toys.
A popular idol that goes to the Ryugu Shelter to perform a concert.
Break the Cutie: Upon learning that she was involved in spreading the Acari X.
Celebrity Survivor: She was a popular idol singer before the impact. Though as it turns out, her personality is almost as sweet and angelic as her actual singing.
Genre Savvy: She's one of the first to notice that something's off about Ryugu. Namely the fact that the Director's opening speech comes across as stage-rehearsed rather than something a politician would say.
Go Out with a Smile: She's implied to have kept on singing and performing until her last breath. In fact, she smiles at the very last time Mark sees her, just before the freezer's doors close.
Heroic Sacrifice: Willingly chooses to seal herself in the shelter's freezer along with nearly all the remaining (and infected) survivors. Not only does this put the Acari X into stasis. But she's also aware that this would also ensure that when the power does die out, the contagion would have nowhere else to go.
It's What I Do: What she convinces herself to keep from breaking down, as well as what she uses to remind others of why they're even in the shelter in the first place. After all, this was what she (and the others) signed up for.
Locked in a Freezer: Her ultimate fate, her frozen body still entertaining and reaching out to the similarly frozen infected for all time...or at least until the power finally runs out.
My God, What Have I Done?: When the theory was set up that her dog Ten-Ten was the hidden carrier of Arcia X, she asks this of herself and whether it was a good idea to bring the dog along. Has another, minor one when she realizes that she was the actual carrier.
Typhoid Mary: Turns out she's the carrier of the Acari X, and the reason that the infection spread so thoroughly- even as things got worse, everyone still went to her concerts.
A popular baseball player that Takashi scouted with the words whether he can be a baseball player until the end.
Celebrity Survivor: A famous baseball player brought in to entertain the people in the shelter. Although several of the entertainment crew counted as this, Hino is the only one to be recognized by the survivors in the future who read the account - Aramaki is apparently a fan.
Friend to All Children: He spends time with the children who are dying of the Acari X infestation and tries to entertain and comfort them, and he is very hard hit by their illness and eventual deaths.
The man that scouts most of the people that work behind the scenes in the Ryugu Shelter, who also had a big role in the creation of the 7 Seeds project. He's Hana's father and one of the former teachers of Team Summer A.
The Atoner: He's shown to have many regrets, including his decision to have his own daughter participate in the 7 Seeds program, and knows that they'll bite him in the ass one day. Still, he tries to make up for them to the very end.
Cyanide Pill: Apparently, he kept some just in case...which looked more or less similar to the ones given to the 7 Seeds Guides.
Dragon-in-Chief: Officially, he's under orders from the government remnants who are nominally running the show. In reality, it becomes clear early on that he's the one actually calling the shots.
The Extremist Was Right: He supported the Seven Seeds project- which was considered a longshot and crazy by comparison with the shelter plan- from the beginning. In the end, it looks like he was right about which method would ensure some people's survival.
Jerk with a Heart of Gold: He did terrible things, especially when he appeared during the Team Summer A flashback arc, but he does prove his good intentions during and later.
I Know Karate: Despite struggling with the Acari X infection, he proves to the minister's cocky aide that you'd have to do much more than "dabble" in martial arts...with quick and fatal results.
The Reveal: A number associated with him. He's Hana's father, he was one of the teachers of the Summer A candidates, he's the person calling the shots in the shelter (including deciding when to start killing people). Oh, and he's also Assistant P.
Redemption Equals Death: His last act was to drag himself along with the (likely-infected) officials to the sacrificial fan, thus not only redeeming himself but also preventing the Acari X from ever leaving the shelter.
Sink-or-Swim Mentor: One of many to the Summer A candidates, most of whom are in fact expected to sink.
Sympathetic P.O.V.: The brief parts of the Ash arc that follow him emphasize his love of his wife and daughter, rather than the terrible things he's done (which are shown from Mark's or Ango's POV instead).
Talking with Signs: As Assistant P, he does this rather than speaking aloud, which would reveal his identity.
Large Ham: He wasn't successful as an actor because he was too dramatic and generally overdid things. This actually helps him in upholding his part of The Masquerade - people think that because he is so dramatic and loud, he'd also be a bad liar and bad at keeping secrets.
Nice Guy: He is a very nice guy, very optimistic, friendly and never seemed to loses his patience with anyone.
A well-known broadcaster and musician who has previously worked with Maria and was scouted by Takashi to take over broadcasting duties for the Ryugu Shelter.