A list of characters from the series Dr. Stone.
In the year 2017 (Or 2019), billions of humans and animals inhabiting the Earth were turned into stone statues under mysterious circumstances. These are the people who either woke from their stone imprisonment through sheer willpower or were freed by Senku's de-petrification formula.
- And I Must Scream: As Senku noted, it's possible to stay fully conscious after the petrification by keeping your mind really busy at all times. While this comes at the cost of unimaginable boredom, it's perhaps better than the alternative; quickly losing consciousness and the ability to break out on your own.
- Charles Atlas Superpower: A large chunk of the characters have one area of expertise that they're almost superhumanly skilled at. Senku is a genius among geniuses, Taiju is an indefatiguable Stone Wall, Tsukasa is the World's Strongest Man, etc.
- Good Scars, Evil Scars: While the crack marks on Senku, Yuzuriha, and Taiju are small and neat, Tsukasa and his goons have very large cracks that often span the entire length of their faces. Meanwhile, the ambiguously neutral Gen has a single, moderately sized scar.
- Healing Factor: When going through the depetrification process, no matter how small the petrified body part is, all injuries are miraculously healed, including fatal injuries. Even braindead patients will wake up, fully conscious, when they are de-petrified.
- Improbable Age: Despite all being teenagers, most of them are extremely well-versed in at least one area of expertise or have some special skill (or several, in Senku's case) that would realistically just take several more years to master than any of them have actually lived. Senku himself, of course, is the main offender; he's probably several times more knowledgeable than any doctor or scholar could ever hope to be.
- Really 700 Years Old: All of these characters are really thousands of years old, as they all were frozen for over 3,700 years before being freed. Of particular note though is Senku and Taiju, who were actually conscious the entire time and are therefore technically really, really old men still living in their teenage bodies (though they evidently still act just like they always have upon being freed).
- Scars Are Forever: A side effect of the de-petrification process is that prominent cracks are permanently created on the face when the stone breaks apart unevenly, creating quick identifiers to separate those who were de-petrified and those who were born into the Stone World (Though Yuzuriha's mark is inexplicably on her shoulder rather than her face). However, chapter 116 reveals that being re-petrified then de-petrified shortly afterwards can cause the scars to disappear.
- Taken for Granite: All of these characters were frozen in stone for thousands of years before being freed, whether by their own determination or through Senku's de-petrification formula. Interestingly, it seems that it's possible for people to remain conscious and eventually break free from the stone by themselves as long as they keep their minds busy (as demonstrated by Senku and Taiju); otherwise, consciousness is quickly lost and the person will have to be freed by someone else. They will also wake up completely unaware of their circumstances (as demonstrated by everyone else).
Voiced by: Yuusuke Kobayashi (teen), Mikako Komatsu (child) (Japanese), Aaron Dismuke (teen), Mikaela Krantz (child) (English)
A high school student with an intellect and well of knowledge that could rival even the modern world's greatest minds. Case in point his dream is to go to space, by making his own rocket. After being petrified, he was able to remain conscious by constantly counting the seconds for 3,700 years. His current objective is to recreate civilization in the Stone World, by creating what he calls a Kingdom of Science.
- Accidental Marriage: Because Chrome passes out from the injuries he sustained fighting Magma, Senku (who was planning on throwing his match to Chrome) ends up winning the village games and marrying Ruri. However, thankfully, he also became the village chief as a result of his victory... giving him the right to divorce Ruri on the spot not 5 minutes after "marrying" her. Ruri, naturally, was dumbfounded by the whole thing.
- And I Must Scream: Unlike many others whose consciousness faded over time after being frozen, Senku stayed awake during his entire petrification by counting the seconds the moment he was frozen. However, he ends up just fine after waking up.
- Anime Hair: Bigger than his head even. It's especially noticeable because he's only character who has such. Also, it has the tips dyed.
- Attractive Bent-Gender: When the gang tries to create suitable candidates to infiltrate the Head's harem of girls, Senku turns out to look surprisingly not-too-bad while disguised as a girl. Unfortunately for the sake of the mission though, his voice is too deep to be convincing.
- Back from the Dead: Tsukasa actually killed Senku in chapter 10 but he was able to come back to life due to the unpetrifiation process healing the bodies of the petrificated.
- Beyond the Impossible: Not only did Senku count off the seconds for thousands of years while frozen, but was also actively thinking to himself about the situation at the same time. To get an idea of how ridiculously difficult this is, just try thinking about anything constantly for 5 minutes while also actively counting. To do that for thousands of years is some insane multi-tasking.
- Cannot Tell a Lie: According to him "Science doesn't lie", and neither does he when it comes to science, even in situations where doing so would benefit him. Early on, when Tsukasa holds Yuzuriha hostage and demands to know the formula for the "miracle water", Senku complies rather than giving him a false formula just to save his friend. When they're trying to sway Nicky to their side, she asks if they can bring back Lillian Weinberg's music; Gen encourages him to lie and say yes, but Senku admits that all music storage media from their time have long since crumbled into dust. It also works the other way around: he won't lie to give someone false hope, meaning if he says it's possible to save someone's life he really means it, as seen with both telling Tsukasa that de-petrifying his sister Mirai might restore her from clinical brain death, and later telling Mirai that they can use the "stone beam" to save Tsukasa from the mortal wound Hyoga inflicted upon him.
- Often uses the number ten billion, for example by claiming something is 10,000,000,000% certain.
- Not even 1mm comes up as the negative of the above, for example "I'm not even 1mm interested in that."
- This is exciting! and variants is also used a lot whenever he either succeeds in his goals or a new challenge that needs science comes up.
- Character Tics: Early on in the story he tends to put a hand on his neck and roll his head in order to crack his neck joints. After Tsukasa "kills" him by breaking his neck, Taiju and Yuzuriha figure out that he was doing this gesture (which he never did in all the time they'd known him) on purpose — to get Tsukasa to attack a place on his body that was still petrified.
- Later on he tends to pick in his ear with his pinky finger, usually to show annoyance or nonchalance towards someone.
- Celibate Hero: He's a combination of the "thinks love is a distraction" and the "socially awkward" variety. When Kohaku tells him that she's "starting to fall for him" when he first meets her, his reaction is to frown and sweat nervously before getting annoyed and quipping that "a brain in love is the most illogical variety of trouble" (Luckily for him, she didn't mean it that way, anyway). Amaryllis's great beauty and charm also have no effect on him, shocking her and leaving him totally unimpressed.
- A few characters like Gen seem to believe that Senku is simply laser-focused on restoring the world and might be more open to pursuing romance once he's accomplished that goal, but Senku himself has neither confirmed nor denied this idea.
- Childhood Friends: Formed a Two Guys and a Girl trio with Taiju and Yuzuriha up until high school. Interestingly, both he and Tsukasa believe that the four of them would've been great friends had they met Tsukasa during their childhood, with Senku imagining a What If? scenario where Tsukasa would have protected him and Taiju from bullies.
- Child Prodigy: One chapter shows him reading a book about electromagnetic forces in class while the teacher is explaining basic addition.
- Combat Pragmatist: Since he's got pathetic physical strength and no talent for fighting at all, he's not above hitting below the belt as a last resort means of defending himself. Just ask Ginro.
- Deadpan Snarker: Fitting his intelligence, Senku is very quick-witted and has a dry sense of humor; about 90% of his dialogue consists of teasing or playfully insulting his friends in one way or another. Despite this, however, he is capable of being genuinely friendly... when he feels like it.
- Determinator: Despite his lack of physical strength and durability, Senku has tremendous mental fortitude; he was fully conscious for the entire 3,721 years that he was petrified, and he spent the entire time counting the seconds in order to keep track of time. Even more impressive, he managed to retain his sanity despite the unbelievable boredom that must have ensued.
- Disappeared Dad:
- As his dad Byakuya was up in space during the stone explosion (and also eventually founded the village Senku now controls), he's long dead by the time Senku is freed from his petrification.
- Furthermore, with the reveal that Byakuya was only Senku's adoptive father, the status of his biological dad (and mom for that matter) is completely unknown.
- Doing In the Wizard: Pretty much anytime any character references something occurring spiritually, expect Senku to give the actual scientific explanation.
- Einstein Hair: Exaggerated to its logical extreme. Senku himself is, of course, a fan of Einstein and bases some of his creations on his work. One of the cover art pages even features Senku dressed as Einstein and doing his signature tongue-poke. In chapter 93, Senku also does the pose for the first photograph taken since the petrification.
- The Gadfly: Aside from his intelligence, one of Senku's defining characteristics is how much he enjoys using his knowledge to screw around with people and piss them off just for the sake of it.
- Geek: Besides being scientifically minded, he's clearly a fan of video games (name-dropping Monster Hunter and Dragon Quest in specific) and anime (including Doraemon, Gundam, and Dragon Ball).
- Geek Physique: He's a genius, and while he has an slim, athletic body, he's not very strong or muscular. Or at least, compared to everyone else.
- Fake-Out Make-Out: When Kohaku gets into a fight with Kirisame and realizes she's both in over her head and possibly about to blow their cover, Gen bails her out by getting her to kiss Senku and trick Kirisame into thinking she's just a lost girl looking for her boyfriend. Considering Kohaku and Senku are both Celibate Heroes though, both of them are... not particularly into it.
- Family of Choice: While it was already established that they weren't blood-related, Chapter 115 reveals that Senku was apparently the child of Byakuya's best friend. He doesn't know anything beyond that, but he really doesn't care because it doesn't matter to him; he and Byakuya were father and son.
- Freudian Trio: The Superego to Taiju and Chrome's Id and Kohaku and Yuzuhira's Ego.
- Given Name Reveal: His last name is revealed in chapter 41 to be Ishigami. Which is a spoiler, because before that fact is revealed, we learn that the stone village he's been staying in for the past six months is called Ishigami Village.
- Go Mad from the Isolation: Averted. Despite remaining fully conscious and petrified for 3,721 years, he emerges as spirited and snarky as ever. He even spends an additional 6 months alone before Taiju wakes up.
- Good Is Not Soft: If you're on his side, he'll gladly treat you like a friend and occasionally even go out of his way to make something to help you specifically, such as a pair of glasses. If you're not, you're getting the blunt of his scientific advances, as Tsukasa's goons find out.
- Handshake Substitute: He tends to do high fives, but there's a greater significance behind them than just saying "hello". If Senku high-fives you, it's him metaphorically tagging you in; it's his symbol that he has complete trust and faith in your abilities. A few characters like Kaseki and Suika have picked up on this, and actually asked for (and received) high fives before starting on some important job.
- Happily Adopted: Not related to his dad by blood, but they got along great before the petrification event separated them.
- Heroic Albino: The first few images of him featured Senku as a blond teen, but more recent images have him with white hair and red eyes. In an AMA by Boichi, he told one fan that he isn't good at colouring, and that it's canon that he's white hair.
- Heroic Sacrifice: Even knowing that Tsukasa will kill him once he has the revival formula, he tells it to him anyway so he can let Yuzuriha go free. Tsukasa then proceeds to strike his neck with enough force to kill him... which would have been successful had Senku not had a small, hidden piece of stone still left on his neck.
- Hellbent For Leather: His clothing is made from leather he obtained by killing and skinning wild deer.
- Hidden Heart of Gold: Despite his eccentric personality and ego over his intelligence, Senku does have the goal of restoring humanity and cares about Taiju and Yuzuhira. He even keeps his promise to Gen and makes him a bottle of cola.
- Insufferable Genius: He is always certain of something at ten billion% in the bag, and is not shy about reminding people just how smart he is.
- Jerk with a Heart of Gold: While he generally looks down on people due to being so much smarter, he does genuinely care about Taiju and Yuzuriha, and while he may sound like a Mad Scientist, he disproves Tsukasa of having any sort of misanthropy, with his goal having altruistic motives.Senku: I am a technology loving kid, who's excited by mecha, space, and Doraemon! I will save all of humanity, without exception, with the power of science!
- There's also the fact that when he make glass, he decides the first thing he'll do with it is make Suika glasses.
- As exemplified by the quote, despite his superiority complex, Senku's long term goal is to restore humanity from stone.
- He may tease Taiju a lot, but it's clear that Senku has absolute faith in his friend. The gasoline "love potion" prank may seem extreme, but afterwards Senku explains that he only offered it because he knew Taiju was too honest and noble to even consider using such a thing. He also believed that Taiju's confession would succeed (when everyone else thought he'd get shot down), and knew that Taiju would be able to overcome the petrification because his pride as a man wouldn't let him accept his confession being interrupted.
- Despite somewhat cruelly mocking Chrome because it was likely Ruri would end up marrying Kinro or Ginro, Senku does help him win his fight in the tournament when the time comes. Furthermore, when he actually ends up winning the tournament and marrying Ruri, he immediately finds a reason to divorce her rather than try to take advantage of the situation (it helps that he's a Celibate Hero, though).
- When trying to win over the trust of Ishigami village, Kohaku frequently remarks how he sounds like an evil villain out for conquest when he talks about it, despite it ultimately being beneficial for everyone involved.
- There's also the simple fact that he's the World's Smartest Man without being an Insufferable Genius (except for brief comedy beats). Quite the opposite, Senku recognizes that progress takes all kinds of people and readily acknowledges those who possess skills he lacks, praising Kaseki as a master artisan, nicknaming Suika "Great Detective" for her investigative skills, and entrusting Yuzuriha with the secret mission to fix the statues Tsukasa and his people broke because he respects her precision and skill with handicrafts.
- Lethal Chef: He knows how to cook but due to lack of experience and the quality of the ingredients at hand, Senkus more complex dishes like ramen and bread tend to taste horrible to anyone but the villagers of Ishigami Village.
- Mad Scientist: Definitely has shades of being one at least, as he tends to take great joy out of using people like guinea pigs for his experiments and he can put on some pretty twisted facial expressions when something scientific intrigues him (as Kohaku often notes). However, it's ultimately Subverted because, despite his trolling nature, he's ultimately got a good heart and has no real interest in using his science to hurt people.
- He has a knack for building crazy things on the fly to help him out in tough spots, such as a cart contraption to make transporting himself and Kohaku to her village easier.
- He defeats Ginro in the village games by balancing his staff on Suika's mask to create an impromptu simple-lever machine, delivering one hell of a Groin Attack by stepping on it at just the right time.
- Manly Tears: He briefly sheds tears at his father's grave before recomposing himself and returning to the village.
- Master of All: Non-combat example. If there is a subject of science he hasn't displayed expertise at, then Senku has simply never gotten the chance to display it.
- Meaningful Name: His surname, Ishigami, means 'stone god'.
- Missing Mom: Back in 2017, his dad only mentioned Senku when Lilian asked him about his family, and Senku's mom has not been seen in any flashbacks. Of course since Senku and Byakuya aren't blood related, it's possible Byakuya never married and raised Senku by himself.
- Not So Stoic: He may be intelligent and science-minded, but he still has some classic Shonen Jump traits like absolute faith in his friends and an understanding of Pridenote . Tsukasa calls it his weakness, since he can't be truly objective and logical when his friends' lives are on the line.
- Senku's hair on the cover pages has gone from being blond◊, to light-green◊, to finally white◊. According to Word of God, it was always intended to be white, so all other depictions were inaccurate. The anime went with the "white fading to green" version.
- He's much more muscular on the cover of chapter 1 than he is in the actual series, though that could just have been an artistic decision.
- Omnidisciplinary Scientist: Senku is not only an accomplished engineer, physicist and chemist, since he's been building rockets on his own since childhood, but is also knowledgeable in geology, biology, and of course mathematics. At this point, there's no telling what other areas he has mastery over.
- Our Hero Is Dead: Briefly suffers this early on when Tsukasa seemingly delivers a fatal blow to his neck. It turns out a few chapters later he had a plan to come back to life.
- The Pollyanna: While he isn't as energetic and outwardly positive as this trope implies, Senku utterly refuses to let anything disrupt his optimism regarding what's possible for him to reinvent and the resurrection of all of humanity.
- Really 700 Years Old: Senku is around ~3,739 years old, having spent most of the last 3,721 years fully conscious during his petrification and counting the seconds. Despite this, his body didn't age a day and he more or less still acts like a teenager (or at least, you know, how a teenager with a genius level IQ would act). Lampshaded when he makes wine: Taiju tells him that teenagers shouldn't drink, and Senku replies that since he's over 3700 years old, he's technically an adult by now.
- Reused Character Design: Senku looks like a miniature version of Ken, hell, even when he's drawn as an adult◊, or with a suit◊ he looks even more like him.
- Science Hero: While he may come off as an egotistical jerk, he really does want to restore as much of humanity's science as he can, and create a kingdom for science. To do so, he mostly uses his knowledge to create tools that will help him and his allies.
- Sharp-Dressed Man: While the Stone World has forced him into wearing simpler clothing, the What If? cover art (which features the village characters and Senku in the past) shows that his natural fashion sense leans towards sharp suits.
- Signature Laugh: Kukuku
- Spell My Name with an "S": "Senku" or "Senkuu", depending on which transliteration convention you use. Although the official translations use "Senku", the spelling "Senkuu" can be seen in some places, such as on the side of the rocket he made in his childhood.
- Squishy Wizard: Teen Genius he may be, with enough scientific knowledge to potentially restore civilization, but compared to just about everyone around him, his physical abilities are practically nonexistent.
- Teen Genius: As a former Child Prodigy, he was naturally just as brainy during his high-school years. Even today, he's most likely still a teenager; assuming he was frozen at 15 or 16 (it was revealed that the stone incident happened 5 years after his 5th-grade year), he should currently be about 17 or 18 (technically, at least).
- Thanatos Gambit: He anticipated Tsukasa's FaceHeel Turn and started performing a Character Tic that drew attention to his neck; when Tsukasa attempted to give him a quick and painless death he struck that precise spot. After getting away Taiju and Yuzuriha discover a tiny patch of petrified skin at the base of Senku's neck and figure out that he was specifically baiting Tsukasa to strike him in that spot because they could use the secondary healing aspect of the depetrification process to bring him back to life, which would buy them some (but not much) breathing room while Tsukasa still believed him dead.
- Troll: Senku really likes screwing around with his friends. A stand out example, though, would be when he rubs it in Chrome's face that his crush Ruri is probably going to end up marrying Kinro or Ginro due to their village's customs.
- Tsundere: He's a lesser example of a Harsh type, tending to put on a tough-guy act and say things like "I invented this to help myself, any benefit you get is secondary". However, he's also very open about how much science improves peoples' lives, and the affection he has for the villagers makes it clear that he isn't nearly as harsh as he sounds.
- Two Guys and a Girl: Has formed a trio like this with Taiju and Yuzuriha for most of his life, including the events of the first arc in the manga. He also quickly forms one with Chrome and Kohaku after meeting them.
- Weak, but Skilled: Not only does Senku have no fighting or hunting capabilities like Taiju, but he also lacks physical strength and endurance. However, Senku is possibly one of the smartest and most educated people on the planet, and he's definitely the smartest person left in the Stone World. As such, despite his lack of physical power, he's the only one left in the world capable of kickstarting the recreation of civilization. Tsukasa knows this, which is why he's far more concerned about Senku rather than Taiju.
- Wise Beyond Their Years: While his great intelligence is often pointed out, what's equally noteworthy is that Senku is rather calm, patient, and sagely whenever he needs to be. Some good examples would be his various speeches to Chrome about what it means to carry on the will of science in the event of his (Senku's) death.
- World's Smartest Man: Genius Bruiser Tsukasa has called him the smartest person he has ever met. The unparalleled expertise he's displayed in various fields of science without modern technology to aid him only supports this status.
Voiced by: Makoto Furukawa (teen), Mutsumi Tamura (child) (Japanese), Ricco Fajardo (teen), Emily Fajardo (child) (English)
Senku's best friend. Though nowhere near as intelligent as him, he is fiercely loyal, and makes up for it with his strength and endurance.
- Anchored Ship: Him and Yuzuriha. Despite obviously liking each other, Taiju decides not to ask her out because they're basically the last people on Earth and he doesn't want to make her feel like she has no other choice.
- And I Must Scream: Unlike many others whose consciousness faded over time after being frozen, Taiju stayed awake during his entire petrification by thinking about Yuzuriha. However, he ends up just fine after waking up.
- Badass Pacifist: Despite his massive strength and endurance, he refuses to fight anyone because he doesn't want to hurt people.
- This is later Played for Laughs, when he first fights Tsukasa, where he declares that he won't fight back, but will allow Tsukasa to keep hitting him as long as he stops breaking statues; however, the sheer lack of logic only confuses Tsukasa.
- The Big Guy: Of Senku's crew. Taiju's physical capabilities are roughly on par with Tsukasa's, given that the latter considered him a serious threat if angered, and though he lacks any will or ability to fight, his toughness and endurance are so absurd he even shocks the stone world inhabitants.
- Book Dumb: Taiju's never going to be a scientist or a scholar, he just simply does not get concepts and theories. But he's aware of his own shortcomings, and not only does he have a decent track record with finding "mundane" solutions that he can perform without science, he also tends to remember things Senku says that he can understand. Taiju might not get why something works, but he can still act on the knowledge that it does. For example, he ends up having the most successful wheat field, simply because he remembered a conversation he and Senku had years earlier, where Senku offhandedly mentions that crushed seashells can improve soil qualitynote .
- The Bus Came Back: At the beginning of the Stone World War arc, he and Yuzuriha return to help Senku fight for the Cave of Miracles.
- Cannot Spit It Out:
- He spent all of his childhood and most of his teenagehood being unable to tell Yuzuriha how he felt. Then, at the very moment he was finally about to confess, the stone explosion happened and he was petrified. It was his resolve to tell her how he felt, in fact, that kept him conscious for thousands of years until he eventually broke free.
- After finally reuniting with Yuzuriha, however, he's now decided that he won't ask her out because they're basically the last few people on the planet and he doesn't want to make her feel like she should be obligated to say yes.
- Charles Atlas Superpower: Crossed into this territory around chapter 11, when he takes this◊ huge rock and throws it a good 6 meters or so directly up into the air. Not even the finest shot-put athletes in real life could do that.
- Childhood Friends: With Senku and Yuzuriha, and he eventually fell in love with the latter.
- Crouching Moron, Hidden Badass: Despite his lack of intelligence, he can prove to be resourceful in his own way when push comes to shove.
- Decoy Protagonist: The first chapter is told almost entirely from Taiju's perspective. Afterwards, however, he becomes the group muscle while Senku establishes himself as the protagonist.
- Determinator: If there's one thing he and Senku share in common, it's their determination. Like Senku, he stayed conscious during the entire 3,721 years he was frozen via thinking of his love for Yuzuriha. He also survives a blow from Tsukasa without any long-lasting effects.
- Dumb Muscle: Frequently pointed out by Senku, he has ridiculous strength, but is dumb as a stump about most things.
- Easily Impressed: Pretty much every science-thing Senku does amazes him to no end, even simple things like using sea salt for food seasoning. Typically, this elicits either appreciation or snarky gloating from Senku (emphasis on the latter).
- Go Mad from the Isolation: Again, Averted, like Senku. Despite being fully awake for almost 4,000 years and unable to move or interact with anybody, Taiju's mental state remains fine after finally freeing himself.
- Heroic Build: In contrast to Senku's wiry build, Taiju is built like a tank of solid muscle. He's perhaps only beaten in this aspect by Tsukasa.
- Hot-Blooded: He definitely does the most shouting and he's extremely passionate about his faith in Senku.
- Made of Iron: The only person to ever take a hit from Tsukasa and stay standing.
- Nerves of Steel: Surprisingly, despite being very emotional and expressive, Taiju has great control over his anger; even when Tsukasa directly threatens Senku and Yuzuriha, he never loses his cool or composure. This shocks even Tsukasa, who was fully expecting Taiju's wrath after he "killed" Senku.
- Nice Guy: One of the kindest characters in the series, he can even put up with Senku.
- Pre-Mortem One-Liner: Subverted. He says "farewell, Tsukasa" before seemingly engulfing him in a huge black gunpowder explosion, but as Tsukasa quickly puts together, he actually had no intention of hurting him; he knew that Tsukasa would survive and he actually just meant "farewell" in a benign sense.
- Put On The Bus: At the beginning of the Stone World The Origin arc, he leaves with Yuzuriha to keep an eye on Tsukasa.
- Really 700 Years Old: Taiju is around ~3,739 years old, having spent most of the last 3,721 years fully conscious during his petrification by thinking of his resolve to declare his love to Yuzuriha. Despite this, his body didn't age a day and he more or less still acts like a teenager.
- The Reliable One: Taiju may be Book Dumb, but he has the endurance and the patience to work literally all day long on whatever Senku needs him to, even if he himself doesn't understand what he's working towards. Also, despite being a very emotional guy, he showcases a lot of self-restraint and emotional control when it comes to enacting Senku's plans. On top of all this, his trust in and fondness for Senku allow Taiju to follow his lead and understand his orders on the fly with even the barest of hints. All in all, Senku couldn't ask for a better friend.
- Stone Wall: Taiju can take a beating easily, but he has no skill in fighting or even the capacity to hit another human being. His solution to dealing with Tsukasa was to allow him to "beat him as much as he wanted" if it meant he would stop killing statues. Tsukasa, being The Spock, is simply confused as he can't see the logic behind that.
- Two Guys and a Girl: Has formed a trio like this with Senku and Yuzuriha for most of his life, though he's been in in love with the latter since elementary school.
- Undying Loyalty: Taiju completely entrusts his life to Senku, and would gladly give up his own life if it means saving Senku's. Same goes for Yuzuriha.
- Unskilled, but Strong: Taiju has none of the scientific knowledge necessary to help recreate civilization and he has no skill at all in fighting or hunting, but he's as strong as an ox and his body is built like a tank. As such, he's most useful handling the demanding physical labor that Senku and Yuzuriha can't do. Furthermore, despite his lack of fighting skill and killing intent, his durability and strength is possibly comparable to Tsukasa himself. As such, while Tsukasa is more worried about Senku than Taiju, he does admit that it would be dangerous if Taiju were to lose control and come at him with full-force.
Voiced by: Kana Ichinose (Japanese), Brittany Lauda (English)
The Childhood Friend of both Senku and Taiju and the girl Taiju loves. She is revived soon after Taiju and Tsukasa.
- Beauty Is Never Tarnished: Yuzuriha's mark is on her shoulder, rather than her face.
- Boring, but Practical: Her exceptional textile abilities dont initially seem as impressive as Senkus vast intellect, Taijus inhuman strength, Gens impressive mentalism, etc. But its undeniable that cloth making is one of the cornerstones for the development of humanity, which means that Yuzu is a massive help for the making of different inventions.
- The Bus Came Back: Again, with Taiju.
- Catchphrase: She tends to say "Wow", even when not surprised.
- Girl Next Door: The kind girl who Taiju knew since childhood and eventually fell in love with.
- Fashion Designer: Once she gets proper cloth to use, she basically invents fashion. Senku exploits it to make money for the Kingdom of Science.
- Hair Decorations: She wears a headband with a couple of round bits that almost resemble headphones. Oddly enough it seems to have been turned to stone along with her body, but she can take it off as seen when the group visits the hot springs early on.
- Mundane Made Awesome: Her talent for arts and crafts is such that, with the limited tools available to her, she can sew together multiple sets of clothes in a matter of seconds. What makes this even more awesome is that the sewing is just a feint. She pretends to need all night in order to make the clothes and uses the rest of her time piecing together the statues that Tsukasa and his soldiers have been shattering.
- Nerves of Steel: When Tsukasa holds her hostage, he cuts her long hair to intimidate Senku into giving up the revival fluid recipe. Yuzuriha responds by claiming he did her a favor, redirects his stone blade at her own neck, and makes it clear she's willing to die if it means Senku won't have to tell him anything. Fortunately, Senku has other plans...
- Nice Girl: She's a sweet, kindhearted, and empathetic young woman, certainly part of the reason Taiju fell in love with her. On the day of the stone incident, she even tried to take a petrified bird to the veterinarian before school (as did Taiju separately).
- Plucky Girl: After being unpetrified, she reacts to the new world fairly well, offering to help Senku and Taiju however she can.
- Put On The Bus: With Taiju.
- Textile Work Is Feminine: Was a member of the handicrafts club prior to petrification.
Voiced by: Yuuichi Nakamura (Japanese), Ian Sinclair (English)
The first person Senku revives from petrification, known as the third man. Before the Stone World incident, he was known as the strongest high schooler, and well known for his immense skill in the martial arts world. His harsh background however has given him a hatred for modern society, and he quickly becomes Senku's enemy in his quest to rebuilt the world.
- Adaptation Personality Change: A downplayed example. In the early manga chapters he would participate in the comedy beats just like everyone else, getting stunned reaction faces whenever Taiju said something stupid. The anime removes this, which makes him look more serious overall despite still having the same dialogue and actions.
- Anti-Villain: He genuinely believes in a better world, but his methods are both questionable and puts him in natural conflict with Senku.
- Arrow Catch: He easily catches the arrow from Senku's crossbow right out of the air, causing Senku to ramp up his efforts on producing a gun.
- Asskicking Equals Authority: After "killing" Senku (not really), he establishes himself as the leader of a new nation of his own creation.
- Barbarian Long Hair: He has long, wild hair and is a force to be reckoned with.
- Benevolent Boss: As long as you're a young person and submit to the rules of his empire, he'll treat you right. In fact, he even remembers the names of all the random mooks who died from "Senku's poison gas attack" (in reality, Hyouga threw his man into a pit of naturally occurring poison just to see if they would really die) and individually buries each one of them.
- Big Bad: Takes this role early in the series, as he makes himself the main obstacle towards rebuilding the world. Eventually loses this spot to Hyoga in the final battle of the first saga shortly before nearly being killed by him.
- Blood Knight: Takes up the fighting job very easily and even enjoys to beat things up every now and then.
- Celebrity Survivor: Tsukasa was a famous martial artist known as "the strongest primate high-schooler" before the Stone World, with countless followers and fans. In fact, Taiju recognized him from TV when he first saw his statue.
- Charles Atlas Superpower: Capable of insane feats of strength such as fighting lions bare-handed, catching arrows, or even chopping a tree in half with one swing of his stone blade, all while being a teenager.
- Chick Magnet: A quick flashback shows that he had legions of fangirls fawning over him during his time as a martial artist. It's currently unknown what he thought of it, although so far he doesn't seem to be too concerned about sex or romance (or even making friends with people, for that matter).
- Child Hater: Inverted, he's a teenager who hates adults.
- Creepy Shadowed Undereyes: They emphasize how dangerous he is.
- Death Glare: Gives Senku an incredibly intimidating one◊ when he rejects his offer to create a "pure world".
- Disproportionate Retribution: One adult beat him up for trespassing on his property and taking seashells, so he thinks all adults need to be wiped out.
- Does Not Like Shoes: It hasn't been brought up in-story yet, but he's clearly shown to not wear shoes. Given his character and ideology, it's probably to symbolize his closeness to earth and hatred of all things modern.
- Establishing Character Moment: He's literally just been woken up from being encased in stone for over three thousand years as a last-ditch act of desperation by Senku and Taiju. Only his eye is visible, but he immediately asks what the situation is, and when Senku tells him, he blows the rest of the stone off his body like bullets before taking out several lions in an instant. Bare-handed. What an entrance.
- Even Evil Has Loved Ones: His little sister.
- Evil Luddite: He's so convinced that modern civilization was irredeemably corrupt that he's entirely willing to kill anyone who might possibly possibly restore it. He sends his soldiers to conquer Ishigami village just on the possibility that Senku had survived and might ally with them.
- Evil Red Head: Cover art reveals that his hair is a deep, blood-red color. Rather fitting.
- Freudian Excuse: His mistreatment in the past is what caused him to develop his hatred of adults and then-current society.
- Friendless Background: Remarks that had he met Senku in the past, he would've been his first friend, and it likely would have changed his worldview for the better.
- Genius Bruiser: He's freakishly strong and a skilled fighter, but unlike Taiju he has intelligence to match, allowing him to keep up with Senku's schemes.
- Genre Savvy: Gen told him that Senku had died and there was no trace of him left. He then sends his army to where Gen looked on the off chance that he did survive. Lo and behold...
- Human Popsicle: Senku places Tsukasa in a cryogenic freeze in order to give him a chance of survival as he looks for the petrification method to heal his wounds.
- Just Like Robin Hood: Part of Tsukasa's desire to eliminate adults stems from his belief that they'll begin to impose taxes and bills on the weak and start profiting from them again. Unfortunately though, Tsukasa has taken to killing all of the adult statues he finds without concerning himself on whether or not they were rich or even bad people in the first place.
- Knight Templar: Is thoroughly convinced that he's the good guy and is simply doing what's necessary to create a pure, untainted world.
- Large and in Charge: He's so tall that Senku only reaches up to his◊ waist, and he quickly establishes himself as the king of the Stone World as soon as he thinks Senku is dead.
- Lightning Bruiser: He's got all the speed, strength, and (presumably) endurance of Taiju, but with the fighting skills to put them to use against other people (and wild lions and sharks, for that matter). As Senku notes, in a world without guns, he's quite literally unstoppable. As a bonus, he's also a Genius Bruiser with enough knowledge of the natural world and strategic sense to keep up with Senku.
- Literally Shattered Lives: What he does to the petrified bodies of any older adult he comes across.
- Long-Haired Pretty Boy: He has this look going for him, although he has wilder hair and is far more intimidating than is usual for the trope.
- Meaningful Name: "Shishio" means "lion king", which is fitting since killing a lion is the first thing he does after waking up.
- Morality Pet: His little sister. In fact, Senku finding and awakening her was enough for Tsukasa to agree to abandon his ambitions and call off his mission to cull society.
- Mr. Fanservice: He's rather prone to the Female Gaze whenever he takes his shirt off (or, in the case of his very first appearance, is nude).
- Not So Stoic: Every now and then, he does get visibly surprised; Taiju's and Yuzuriha enacting Senku's plan to fend off Tsukasa with a black powder explosion was even enough to warrant an Oh, Crap! from the latter. Likewise, Kohaku's strength had him a bit flustered (not enough to make him actually break a sweat, but enough to surprise him).
- Oh, Crap!:
- Ping-Pong Naïveté: And holy hell how. Tsukasa shows a frightening amount of insight into Senku's actions and motivations. By the same token, he is amazingly blind to the personalities of his own followers. For example, he realizes that Senku survived their "final" encounter pretty much immediately, and generally manages to match wits with him, if not intelligence. However, despite Senku pointing out that he was in this to save everyone indiscriminately, he blindly believes Hyoga's story that Senku used poison gas to kill his men (Hyoga actually killed them to test the lethality of a gas cloud). He seems to assume that everyone who's on his side both agrees with him and shares his morals, and doesn't question them.
- This bites him in the ass when Hyoga betrays him. As it turned out all Hyoga needed to do was keep his mouth shut about his actual goals to get in a position close enough and wait for an opportunity to usurp Tsukasa, who wholeheartedly trusted him in spite of not really knowing Hyoga.
- Put on a Bus: The conclusion of his saga as the Big Bad sees him fatally wounded by Hyoga after his HeelFace Turn and needing to be put on ice while Senku and the others set out to find out how to cure him via petrification.
- The Rival: Towards Senku, due to their opposing desires for the new world.
- Science Is Bad: Beyond his hatred of adults, he also hates modern society in general, seeing the Stone World as a paradise untainted by people who wish to control land for themselves. He's essentially the opposite of Senku, who was actually first alerted to Tsukasa's dangerous nature when he mentioned ominously that "he just realized he (Senku) could probably recreate modern civilization from scratch".
- Soft-Spoken Sadist: Tsukasa rarely raises his voice, typically only speaking with a soft, even tone- even when he's threatening to kill people. It's rather... unsettling.
- The Spock: Tsukasa shows very little emotion beyond Tranquil Fury and annoyance. Being rather intelligent as well, he even takes a book straight from Spock's page at one point when he chastises Taiju for "failing to see the logic in his resolve". note
- Strong and Skilled: He has freakish Super Strength, but his combat prowess is backed by impressive martial arts talent.
- Super Strength: Strong enough to kill a lion with a single punch and crush rock with his bare hands.
- Taking the Bullet: When Hyoga betrays him, he ends up impaled on Hyoga's spear to take a blow that would have otherwise killed Tsukasa's little sister.
- Tranquil Fury: Tsukasa never openly rages or rants when he's angry; rather, he just gives off a frighteningly intense Death Glare towards whoever crossed him. It's enough to unsettle even Senku.
- The Unfettered: He points out that, while Senku may claim to be The Spock, he still has people that he cares about who's lives can be used as a threat against him (in this context, Taiju and Yuzuriha). Tsukasa, meanwhile, despite having hundreds of followers and fans note has nobody that he actually truly cares about. This is why Tsukasa ultimately believes he's destined to win over Senku. Ironically, he turns out to be correct in a way, but its Tsukasa himself who gets bit in the ass by this; immediately after his long-thought dead little sister is brought back to life, Hyoga uses her life against him in exactly this manner.
- Verbal Tic: He uses an affirmative "Mmm" (equivalent to saying "Yes") at the start of most of his sentences.
- Villain Respect: Tsukasa might have tried to kill Senku, he might be perfectly willing to kill Taiju if the latter ever goes into a rage and tries to attack him, and he might be dismissive of Yuzuriha as a woman in a world without science, but it's fairly obvious that he respects the first two at the least, and he allows Taiju and Yuzuriha into his kingdom without fuss, even if he keeps an eye on them to make sure they're not helping Senku.
- Visionary Villain: His goal of building a stone age society in harmony with nature and free of the corruption that plagued the modern era is certainly ambitious, and he's put a lot of thought into how to go about it. To that end, he's gathered the statues of dozens (if not hundreds) of people who he believes can play a part in bringing his vision to life.
- Well-Intentioned Extremist: Wants to take advantage of the new world by shaping it into a more peaceful one. Unfortunately this includes destroying the statues of adults who ruined the world and halting the advance of science.
- World's Strongest Man: In a world without guns or explosives, Tsukasa is a One-Man Army.
- Younger Than They Look: Tsukasa is still high-school aged (presumably around 17-19), but his height and musculature make him look quite a bit older. Somewhat ironic considering his hatred of adults.
- I've got no policies, morals, or hangs-ups at all! The world's most silver tongued man!
- Adaptation Dye-Job: The lighter end of his hair has gone from gold in official artwork to white in the anime.
- All Men Are Perverts: During his introduction, he somehow manages to creepily hit on Kohaku in the middle of being threatened with having his throat slit (by her, no less). He later goes on to say that all he really wants out of Tsukasa and Senku's conflict is to find a cozy place to stay and cute girls to keep him company.
- Attractive Bent-Gender: When the gang tries to create suitable candidates to infiltrate the Head's harem of girls, Gen proves to look really convincing as a girl and can even change his voice to match the part. Unfortunately for the sake of the mission though, he's apparently too tall to make a fully convincing girl.
- Astonishingly Appropriate Appearance: His scar is abstractly mouth-shaped. On certain zoom-ins on his face, it becomes noticably spikier, like it's baring fangs.
- Big Damn Heroes: He recovers from his injuries in the nick of time and distracts Magma long enough for Chrome's plan to work.
- Birds of a Feather: Once he joins Senkus Kingdom of Science, the two of them get along like a house on fire, often exhibiting similar mannerisms and sharing a love of trolling their friends. Senku is always quick to catch onto Gens schemes, and often assists in their exectuion.
- Bunny-Ears Lawyer: He's lazy, self absorbed, and perverted, as well as a willing turncoat if it secures his own comfort. However, he is at his core a genuine magician and mentalist, both skills being used to distract and manipulate people on levels that have even saved other characters' lives.
- Celebrity Survivor: Like Tsukasa, he was famous in Japan before the Stone World, being a well-known magician and author.
- Chekhov's Gunman: Appeared on the cover of his book, "Magic Psychology", in a flashback in chapter 12. He would properly debut on chapter 23 as Tsukasa's spy, and someone Senku would have to convince to join his side.
- Consummate Liar: His defining trait; he's a self-described "mentalist" (more of a showman/magician as Senku puts it) with a good understanding of human nature, and so he's easily able to trick people and sway things to his favor with his words. He's not called the "silver-tongued man" for nothing, after all.
- Crazy-Prepared: Apparently, he walks around with protective padding and packets of animal blood under his clothes in the event of a surprise attack. And, sure enough, this allows him to survive an assassination attempt by Magma.
- Creepy Good: Dude can't even plan a birthday party for a friend without going into some kind of "Evil Planning Mode," complete with Nightmare Face.
- Does Not Like Shoes: Like Tsukasa, Gen doesn't wear shoes. However, unlike Tsukasa, Gen would probably love to wear shoes. Keep in mind that he had to walk around 80 km barefoot to get to the village, and he's not an overpowered freak of nature like Tsukasa. This may or may not have contributed to his switching allegiance to Senku's kingdom of science.
- Good Is Not Soft: Like Senku, he isn't afraid of using his field of expertise against people he's against, as seen as when he sabotages Magma and Hyoga early on. However, those on his good side get his upmost respect, Senku in particular being gifted a telescope on his birthday out of Gen's own kindness.
- Guile Hero: Gen has profound knowledge of human psychology, which lets him read and manipulate other people with ease. Once he pulls a HeelFace Turn to the Kingdom of Science's side, he takes upon this role, contrasting the Science Hero Senku.
- HeelFace Turn: Ends up loyal to Senku and lying to Tsukasa about his survival when promised some soda.
- Faking the Dead: He plays dead after being stabbed several times by Magma, having survived through the various cushioning on his body and selling it through packets full of animal-blood.
- Flower Motifs: He's heavily associated with nightshade, which means "liar" in flower language. He proclaims it's his favorite plant.
- Foil: To Senku. Both are from the modern era and were considered "geniuses", except Senku's was in a more straightforward field while Gen was a master in psychology. Senku is very blunt with people but is genuinely well intentioned, while Gen is a skilled manipulator and is easily swayed through appealing to personal comfort. Senku is also a Celibate Hero while Gen is a Covert Pervert.
- The Lancer: Like Chrome, he's relatively on-par with Senku and becomes his left-hand man and commentator over the scientist's antics.
- Locked into Strangeness: Back in 2017 his hair was all black (as seen on a magazine cover), but after being revived from petrification it's gone half-black and half-white.
- Mundane Utility: He was a stage magician and mentalist in the old world. In the new world, he frequently applies his skills in the latter to ensure that Senkus Kingdom of Science runs smoothly, using his skills to induce cooperation, cultivate enthusiasm, and conduct negotiations. Because of this, he soon becomes an essential element in the smooth running of several of Senkus schemes.
- Nerves of Steel: As noted by Kohaku, he's visibly not nervous at all when being threatened with spears, despite claiming otherwise. This is probably because he has all sorts of cushioning on his body that allow him to survive in the event of a stabbing. And possibly due to his confidence in his ability to manipulate people.
- Obfuscating Stupidity: He's shown to fire back and forth between his true colors as a deadpan manipulator to a ditzy airhead.
- Opportunistic Bastard: Although he works for Tsukasa, he's not shy about letting Senku know that he'll change sides if Senku's kingdom of science seems more appealing. True to his word, he was impressed after seeing the creation of a electric lightbulb, but fully joins Senku' side once he was promised he would receive some delicious Cola.
- Pig Latin: The Viz translation gives him this as a quirk in his speech.
- Reverse Mole: Takes on this role after deciding to side with Senku's kingdom of science, pretending to be loyal to Tsukasa while undermining his forces from within. His deception is exposed when he sabotages Hyoga's weapon.
- The Social Expert: He once wrote a book on psychology, and uses this knowledge to manipulate people.
- Stage Magician: What he was famous for before the Stone World. Nowadays though, he actively takes advantage of his skills to trick the primitive villagers into thinking that he really is a sorcerer.
- Straight Man: Acts as this whenever Senku proposes a seemingly impossible contraption to build, like a telephone or a car, since he's usually the only other de-stoned person around to know how ridiculous those ideas sound.
- Trademark Favorite Food: Cola.
- The Trickster: Whereas Tsukasa has his physical strength, Taiju has his endurance, and Senku has his intelligence, Gen relies on his charisma and ability to lie to get by in the Stone World. In fact, while not as book smart as him, his cleverness rivals Senku's and allows him to stay on equal footing with him when sparring wits.
- Verbal Tic: In the Viz translation, he's fond of igpay atinlay.
One of Tsukasa's lead generals, who makes his presence known when the Stone War Arc begins.
- Bad Boss: Unlike Tsukasa, he gives no value towards the lives of his subordinates, killing them on a whim freely and then lying to the former about it. It sets up his true nature as TheStarscream, as it's our first glimpse at just how different he is from Tsukasa.
- Batman Gambit: Knowing that Tsukasa is too strong to overthrow directly, he plays the part of a loyal subordinate until Mirai is awakened. He then attacks Mirai, knowing that Tsukasa would throw himself in front of Hyoga's spear to protect her.
- Big Bad: Takes over as the main threat at the conclusion of the Stone Wars arc, as it turns out he was simply trying to usurp Tsukasa from under him.
- Blade on a Stick: His weapon of choice is a long spear.
- The Dragon: Seems to be this for Tsukasa. Is later revealed to be Co-Dragons with Ukyo, though Hyoga still seems to have more pull between the two of them.
- Catchphrase: He likes to say when or not things are "done properly", almost to the point of being a Verbal Tic.
- Everything's Better with Spinning: His fighting style involves twisting his spear in such a way that the tip moves in a circular rotation, making it nearly impossible to block.
- Eyes Always Shut: His eyes have always been shut in every scene he's in. Ironically, one of the first things he says is to notice Kinro's bad eyesight.
- Good Scars, Evil Scars: In contrast with the small, relatively ignorable scars characters like Senku or Gen have, Hyoga sports a huge pattern of five circles covering his entire lower face that he hides under his turtleneck.
- Hero Killer: Comes inches away from killing Kohaku, and only fails because Gen and Suika sabotaged his weapon. He also stabs Ginro, which would have been fatal had it not been for Senku's medical knowledge.
- Knight of Cerebus: Once he makes his entrance, things quickly become much more serious.
- Lack of Empathy: He gravely wounds Tsukasa just seconds after the man sees his little sister alive for the first time in thousands of years, skipping no beats in taking his throne from him.
- Lean and Mean: He's got a lean, wiry build, but he's easily many times stronger than Tsukasa's army of muscle-heads; moments after being awoken for the first time in thousands of years, Hyoga easily defeats/kills 10 of them at once by himself.
- Social Darwinist: The difference between his ideology and Tsukasa's is that while both believe that the petrification offers them an opportunity to reboot society, Hyoga believes that only exceptional people should be restored while ordinary people are purged.
- The Starscream: He was only Tsukasas underling so he could have a chance at killing him one day.
- We Have Reserves: Sends his grunts to attack Ishigami village under the logic that even if the foot-soldiers all die, it will provide him with valuable intel on whatever defenses Senku has set up. Soon afterward, he knocks them into a cloud of invisible gas to confirm that it's lethal.
Tsukasa's younger sister. She had been rendered brain-dead prior to petrification, leading Tsukasa to become a prize fighter to pay for her life support. After winning the Stone War, Senku uses the de-petrification formula to free her and bring her back to full health.
- Ill Girl: Was deathly ill in the past.
Heir to the now extinct Nanami conglomerate and director of ocean-based Nanami school, depetrified by Senku for his unrivaled captaining skills.
- Ambition Is Evil: Subverted in that Nanami is very greedy but generally his greed means that he pushes for further developments that helps everyone. His butler Francois deeply respects his ambition as he's willing to put in the work to get what he wants.
- Bunny-Ears Lawyer: He was a globe-trotting playboy and an exceptional sailor by his mid teens. Nicky summarizes the trope rather effectively by describing him as "over-the-top but incredibly talented".
- Character Tic: Constantly snapping his fingers.
- Chivalrous Pervert: He has a thing for beautiful women, but he considers all women beautiful and does everything he can to ensure their happiness, including getting stable food supplies for Ishigami Village so they'll never have to lose family to famine again.
- Cruel to Be Kind: When he discovers that Suika stowed away on the science vessel Perseus, Ryusui absolutely refuses to let her stay, saying that they're taking her back to Ishigami Village at the next opportunity. However, afterwards Francois explains to Suika that he's being stern because they're in the middle of a dangerous mission and he'd never risk a child's life. When the ship gets attacked by people with the "stone beam", Ryusui's last act is to get Suika to safety, and after they de-petrify him he praises her for a job well done under difficult circumstances.
- Determinator: One of the positives that comes from his greedy nature is that Nanami does not give up on the things that he wants. And while that would be bad in most circumstances, Nanami's greed extends to the people around him as well. One of his goals is to never see a beautiful woman cry again, and he considers every woman he's seen thus far beautiful, even the elderly.
- Fiction 500: The conglomerate he was part of was rated as valuing of 200 trillion yens, approximately 1.8 trillion dollars. He immediately works to recreate this, demanding monopoly of any oil found and printing money backed by his oil.
- Greed: His primary character trait, though it's not always treated as a problem since it gives him the drive to help rebuild society so that he can live in wealth and luxury again.
- Later on, Nanami makes it clear that, at least in his case, it's a truly positive trait. He's so greedy that he wants the best not only for himself, but for everyone around him. The extent of his greed is so great he can be greedy on behalf of other people.
- Hidden Depths: His debaucherous lifestyle is funded by money he made HIMSELF through the stock exchange, gambling, various competitions, etc.
- Literally Shattered Lives: In Chapter 116, after being re-petrified by the villains on Takarajima, Kohaku breaks him into small pieces so she can ship him back to Senku in his "mouse drones". They put him back together and and de-petrify him shortly thereafter; it helps that Kohaku broke him very precisely to make it easy and avoid small fragments chipping off.
- Meaningful Name: 'Nanami' literally means "Seven Seas", and "Ryusui" means 'Water Dragon'— so, his name can be read as "Water Dragon of the Seven Seas", a fitting name for a captain.
- Scars Are Forever: As with every character released from stone, he has a form of scarring on his body from the process; in his case his entire right hand looks like it was dipped in ink palm-first, seemingly representative of his greed in the stone world. After being petrified and restored a second time in the Treasure Island arc the scars are gone, suggesting that they were the product of thousands of years of weathering.
- Taking the Bullet: Kicks Suika out of the way and off the boat before he and the others on the boat got petrified by the spotted Whyman.
Nanami Ryusui's butler. A faithful and extremely talented servant whose services were in high demand before civilization fell.
- Ambiguous Gender: To the point where nobody knows if Francois is a Bishōnen or a Bifauxnen. Even Nanami has no idea, though in his case he simply doesn't care.
- Foreshadowing: Is mentioned when Nanami reflexively tells Francois to write Senku and the others a check as thanks for freeing him from petrification, but doesn't properly come into the story until it's determined that they need a chef.
- Supreme Chef: The reason why Team Science needs to resurrect Francois, since they need someone who can prepare long-lasting rations for their upcoming sea voyage.
- Undying Loyalty: Fittingly for a butler held in such high regard, from the moment Francois is restored, Francois only concern is how to fulfill Francois employer's desires.
- Dumb Muscle: Only present to pad out the numbers of Tsukasa's army.
- Younger Than They Look: They look more like something out of Fist of the North Star than kids.
A young woman in Tsukasa's army. She serves as Hyoga's right hand and acts as a spy/scout outside of combat, keeping an eye on Ishigami village from the trees.
- Beauty Is Never Tarnished: Her scar is located on her thigh rather than her face.
- Dark Action Girl: Appears to be Tsukasa's very own version of Kohaku; one of the first things she does is prove her worth by nearly burning down the whole village. The jury's still out on whether or not she's really all that bad though; Senku seems to believe that they can convert her to his side with the allure of creature comforts that science can create.
- Meaningful Name: Homura means "flame".
- Playing with Fire: Causes more damage to Ishigami Village than the rest of Hyoga's invasion force combined thanks to her talent for creating and applying fire.
- Weak, but Skilled: She isn't much stronger than Senku, but has gymnastics training which allow her to make the absolute most out of her body's movements.
A sentry in Tsukasa's army. Upon discovering Senku's telephone, she tries to destroy it, until the voice of her favorite singer sways her to turn.
- Amazonian Beauty / Brawn Hilda: Physically, she blends the line between these two tropes; While her figure is definitely 'Amazonian' and she's not exactly ugly either, Nicky is drawn with a lot of muscular bulk, has a rough personality, and isn't styled to be as beautiful as other prominent female characters.
- Boobs of Steel: Has the biggest bust in the series- even bigger than Ruri- so, naturally, she's also the physically strongest girl. She's even able to bruise up the likes of Taiju with her punches.
- Bruiser with a Soft Center: Describes herself as "tough as leather", but holds a deep love for Lilian Weinberg's music.
- Dark and Troubled Past: Strongly implied, as she says that Lilian's music "saved" her, and flashbacks to her childhood show her with bruises and bandages on her face. However, this hasn't been explored past her introductory arc.
- Fangirl: Of Lilian Weinberg, who she listened to during her student days to the point it "saved her". She even knows her exact record sales and three measurements.
- HeelFace Turn: She was firmly on Tsukasa's side until she heard Lilian's voice on the last record on Earth. She swears to protect it by joining Senku's side.
- Non-Standard Character Design: Minor, but she noticeably lacks the "doe eyed" look of some of the other female characters (Kohaku, Ruri, etc) and has more pronounced lips.
- Spotting the Thread: While Senku is able to accurately calculate Lilian's measurements based on a picture of her, those aren't her publicized measurements, which a fangirl like Nicky knows by heart.
One of Tsukasa's direct subordinates. Formerly a submarine sonar operator, he has an extraordinarily sharp sense of hearing.
- Anti-Villain: He's Tsukasa's right-hand man, but quickly demonstrates that he's an affable fellow with a strong sense of fair play. And then it turns out that he's not a villain at all, and willingly joins Senku's side because he wants the bloodshed to end.
- Archer Archetype: Archer hat? Check. Robin Hood-esque clothes? Check. Slim, almost weak-looking body? Check. Deadly precision with a bow and arrow? Check. Yep! He's an archer.
- Co-Dragons: With Hyoga; Yo even refers to Tsukasa, Hyoga, and Ukyo as the "Big Three". However, it appears that Hyoga has a little more authority than Ukyo.
- Cunning Linguist: Speaks both English and Japanese and takes advantage of this to speak to Gen and Senku (both of whom, of course, also know English) without anybody understanding them.
- HeelFace Turn: He becomes a full-fledged ally after Senku accomplishes beating Tsukasa's army without killing anyone.
- Hidden Agenda Villain: Despite having high standing in Tsukasa's army, he lies to Tsukasa about where he captured Chrome, keeping the existence of the hidden telephone a secret for some unknown reason. As it turns out, he's actually averse to violence and is trying to to keep Senku's group around in order to "test them out" and see if they'd be willing to stop Tsukasa's army without killing anyone.
- Improbable Aiming Skills: Shoots many arrows at Chrome, taking care to just barely miss each time. This while he's on the move to shoot from multiple angles and, thanks to a smokescreen obscuring his view, detecting Chrome solely through hearing. His most impressive show of marksmanship, however, has to be when he catches Chrome with an arrow in mid-free fall from a cliff.
- Older Than They Look: Implied. He's at the very least old enough to have been a highly experienced sonar technician even before the Stone Age, but he looks like he could pass for about 14 years old.
- Super Senses: Has an incredible sense of hearing courtesy of working with sonar equipment for submarines before the Stone Age. His eyesight is also clearly nothing to scoff at either, considering his Improbable Aiming Skills with his bow and arrow.
- Technical Pacifist: He doesn't like violence nor watching people die, preferring to use his arrows to corner his opponents and capture them despite his excellent aim. However, it's implied by his position in Tsukasa's army and capture of Chrome that he'd ultimately be willing to kill if he had to.
A former policeman, now a member of the Tsukasa Empire. While Chrome is captured, he's in charge of guarding the prisoner and setting up the traps to foil Senku's rescue plan.
- Blatant Lies: After the Tsukasa Empire falls, he tries to get into the Kingdom of Science's good graces by claiming that he suffered amnesia and doesn't remember anything he did before. Nobody buys it for a second, and he even admits to his "sins" when he thinks that helping Yuzuriha fix the broken statues will win him brownie points.
- Eyepatch of Power: He still has a patch of stone covering his right eye that gives him this look, though he later pulls it off and gives it to his subordinates to use as evidence of his death.
- Becomes part of a Running Gag where every time he gets surprised, his eyes would pop out and destroy the eyepatch.
- Faking the Dead: After Chrome escapes, rather than face whatever punishment Hyoga and Tsukasa would dole out for his failure, he has his subordinates tell them that he died trying to recapture Chrome.
- Lawman Baton: His weapon of choice in the stone world.
- Not Me This Time: A comedic version. As mentioned, he develops a pseudo-rivalry with Magma centered mostly on his making fun of "the savages" for not knowing about modern science. In Chapter 87 when Senku declares that humans are going to fly, Magma starts to laugh it off but immediately suspects Yo is going to mock him...but Yo openly admits "Yeah, I'm not laughing this time, I have no idea what he's talking about either."
- Rabid Cop: In a flashback, he's shown being very flippant about shooting a suspect who was running away.
- Screw This, I'm Out of Here!: Cuts his losses and runs for the hills when Chrome escapes his prison under his watch, not wanting to be killed by Tsukasa or Hyoga.
- Sitcom Arch-Nemesis: Ends up in this dynamic with Magma after the two tribes merge.
- Smug Snake: He thinks he's on the same level as Tsukasa, Hyoga and Ukyo, but he's little more than a stupid, violent thug.
- At one point Gen sets up a boat-designing competition to determine the vessel they'll use to sail to South America. His entry is a shoddily-made raft that wouldn't be considered sea-worthy under ANY circumstances.
- Taking the Heat: Tells his subordinates that, once they report his death, they should place all the blame for Chrome escaping on him to avoid being punished themselves.
Formerly a reporter, Tsukasa utilized her skills to decide who to revive.
- Hair Decs: Similar to Yuzuriha, she has a petrified hairband/headphones/something in her hair.
- Meaningful Name: Her name translates to North-East West-South - in other words, NEWS.
- Ms. Fanservice: Definitely gives Kohaku a run for her money when it comes to how much the camera loves her. Senku outright describes her as a "Marilyn Monroe type".
- It's likely that neither Kohaku nor any of these people know about what was modern civilization. In other words this village is made up of the decendants of revived people!Senku
In the Stone world, there is a small population of 40 people who aren't petrified. When he finds them, Senku believes they're descended from people who were revived.
- But Not Too Foreign: Senku and Tsukasa note that Kohaku and Ruri (and a lot of the other villagers) have foreign blood, but can't seem to place why. Turns out it's because they're descendants of astronauts who returned to Earth from the International Space Station in their Soyuz spacecraft.
- Rock Theme Naming: Everyone in the village is named after a rock or mineral. There are only three exceptions: Genbu, a nameless man (Though his name is revealed in chapter 100 to be Soyuz), and Suika. (Although Suika is a nickname, and her actual name has yet to be revealed.)
- It becomes a plot point later on - since they know the names of so many minerals, they must have even more in their village's lore. So Senku has their storyteller go over everything she knows regarding rocks and minerals.
Voiced by: Manami Numakura (Japanese), Felecia Angelle (English)
One of the village's fighters and caretaker of her sister Ruri. She's also the strongest fighter in the village. Kohaku takes a liking to Senku after watching him confront Tsukasa, then helping her after she is nearly crushed by a tree, and becomes Senku's first villager ally (although she is annoyed by Senku's personality).
- Action Girl: A fighter skilled and strong enough to even go toe to toe with Tsukasa.
- Berserk Button: Hates being called a "lioness", but "gorilla" is even worse.
- Hearing that the top contender in a competition to be her sister's husband didn't care whether Ruri lived or died as long as he got to become the village chief sent her into such a rage that she was banished for attacking him.
- She seems to hate shallow or selfish men, as she immediately takes a disliking to Gen and frequently mentions that she wants to kill him whenever he says something smug. Likewise, on the opposite end of the spectrum, she takes a liking to Senku once she deems him a "gentleman".
- Big Sister Instinct: Technically Ruri is the older sister, but her sickliness means Kohaku is the one who has to protect her. She also has this dynamic with Suika, who she treats like a little sister.
- Book Dumb: Obviously she never had formal schooling, but Kohaku is still fairly clever and quick on the uptake. During the "Arithmetic Battle" bonus chapter she demonstrates at least a basic understanding of multiplication (since it's the easiest way to count large numbers of fish), and during the Treasure Island arc she gets around her illiteracy by sending Senku a Rebus Bubble message to tell him "The platinum is here."
- Cat Smile: Frequently, especially during comic beats.
- Celibate Hero: Aside from some mild flirtations here and there, she overall doesn't seem particularly interested in the whole dating thing, focusing more on protecting her friends and becoming stronger. It also helps that she's One of the Guys and all the men around her typically find her too tomboyish to consider pursuing.
- Cuteness Proximity: When she sees Suika's face for the first time she starts gushing over how adorable she is.
- Deadpan Snarker: She has her moments of snarkiness, usually when one of male-friends is doing something stupid (which is, to say, very often).
- Fake-Out Make-Out: When Kohaku gets into a fight with Kirisame and realizes she's both in over her head and possibly about to blow their cover, Gen bails her out by claiming that she's a lovesick girl who freaks out when her boyfriend Senku isn't around. He then tries to get them to kiss to prove it, but considering Kohaku and Senku are both Celibate Heroes, neither of them are... particularly into it.
- Hair of Gold, Heart of Gold: She's actually really kind. Interestingly, most people from the village are blondes for some reason. Tsukasa even wondered if she is half-Japanese.
- Hartman Hips: Courtesy of Boichi. Lampshaded by Minister Ibara, who points out that Kohaku's "curviness" makes up for her rough personality (right before he very nearly gets his arm and hand snapped in half from attempting to grope her).
- Innocent Blue Eyes: Kohaku has some pretty blue eyes. Seeing her for the first time, Tsukasa wondered if she by any chance was half-japanese due to her eyes and blond hair.
- Knife Nut: Weilds a pair of stone knives as weapons.
- Lightning Bruiser: Extremely quick in addition to her strength, according to Chrome, she's the only one in their village who is agile and strong.
- Love at First Sight: Subverted, says she's "fallen for" Senku after he rescues her, but later clarifies that she just likes people like him and wants to work together. So far she doesn't seem to be lying.
- Mini Dress Of Power: Debatably.
- Ms. Fanservice: While she doesn't fall prey to the usual fanservice for the sake of it, the camera loves her voluptuous body. In a couple of blink and you'll miss it she even has her bare ass against a glass for example.
- Muscles Are Meaningless: She's a slim girl of average height, yet she can easily take down huge, muscle-bound men like Magma and carry a huge vase full of water for several kilometers effortlessly. Senku and Chrome like to refer to her as a "gorilla" (which she, predictably, isn't very fond of).
- Not So Different: In the past her father tried to get her to become the new high priestess, but she refused because that was akin to saying "It's okay for Ruri to die because we have a replacement". After Chrome rejects one of Senku's plans for similar reasonsnote , Kohaku starts treating Chrome with more respect and even says she'd be happy if he married her sister.
- Off-Model: She was wrongly given yellow eyes in the cover of chapter 17, despite the series clearly stating she has blue eyes.
- One of the Boys: Fitting her warrior status, most of her friends in the village are the male warriors. And funnily enough, despite her beauty and the fact that she looks exactly like her sister, Chrome has no interest in Kohaku romantically because she's apparently "more of a gorilla than a lady" (which earns him some knots on the head). Senku has given similar sentiments.
- Pervert Revenge Mode: Minister Ibara attempts to grab at her breasts while "inspecting" her for the Head's harem (which she's only joining in an attempt to rob the Head of his weapons), and he very nearly gets his thumb and arm snapped in half like a twig before being saved by Mozu.
- She's Got Legs: And the artist seems to like showing them off.
- Shipper on Deck: After making sure that he doesn't just like her for her looks, Kohaku seems very happy at the idea of Chrome winning her sister Ruri's hand.
- Straight Man: Plays one for both Senku and Chrome.
- The Tease: She seems to get some amusement out of lightly flirting with Chrome and asking if he'd date her because of her resemblance to Ruri, which Chrome immediately points out is just silly talk before telling her to knock it off.
- Unsound Effect: Whenever she does something that demonstrates her physical strength (like grinding silica sand into a fine powder for glassmaking), it's accompanied by "Gorilla, Gorilla".
- The Worf Effect: She's usually the first person to get pressured in combat by the villain in order to show how powerful they are, falling into this against Tsukasa, Hyoga, and Kirisame. To Kohaku's credit though, unlike most instances of this trope, she rarely ever loses outright but is simply unable to stop them on her own.
Voiced by: Gen Sato
A young villager regarded as a "Sorcerer", but his "sorcery" is the result of very primitive but minutious research and experimentation on his surroundings. After meeting Senku, Chrome develops a respect for his superior and becomes his partner and assistant in matters of science. Chrome has a good heart and wants to cure his crush Ruri from the disease she's afflicted with, hence his research. However, Chrome is also an opportunistic braggart.
- Catchphrase: Frequently describes things he finds cool as "BAAAAD!"
- Collector of the Strange: While his "sorcerous" knowledge is immediately upstaged as soon as Senku arrives, Chrome has also amassed a large collection of various minerals and chemical components that Senku can immediately take advantage of.
- Commonality Connection: Senku regards him as a kindred spirit, as he is the Stone World equivalent of a scientist. Senku was going to teach him everything he knew too, as he believes he could be a worthy successor, but Chrome rejects the offer.
- Everyone Can See It: It's extremely blatant obvious that he's in love with Ruri, but apparently he himself is completely unaware of it. Until Senku calls him out of it, and he realizes that he can no longer hide it.
- Hot-Blooded: Extremely loud and passionate about science, even before he found out what his "sorcery" actually was. Every time one of his experiments produces an interesting reaction, he starts raving about how "BAAAAAAAAAAAAAD" it is.
- Idea Bulb: With the spin that it's linked to the current tech level of the story. For the first 50-ish chapters, his "bulb" is just two hands running electricity through a bamboo filament (based off of Senku's initial demonstration of electric light), but after they invent proper light bulbs he "evolves" into using those instead.
- Manly Tears: After Senku tells him about the technology and science of the previous world, Chrome is broken down to tears at the thought of all this progress being lost.
- Suspiciously Similar Substitute: With his strength and determination, he's essentially a smarter Taiju given those were the same qualities given to the latter boy.
- The Watson: Becomes this to Senku as someone whose self-taught "sorcery" gives him enough of an understanding to follow along, but still needs the more advanced principles and applications of science explained to him.
Voiced by: Tomoaki Maeno
One of the main fighters of the village, serves as a guard and rigidly follows the laws of the village.
- Badass Normal: Besides Kohaku and Magma, he's a force to reckon with.
- Blatant Lies: He wasn't frightened by the bubbles. He was just confused by seeing something out of his range of knowledge. That's why his first reaction was to attack it.
- Good Is Not Nice: He may have a stick firmly implanted up his ass, but he's still a good person. When Kohaku says that she wants his help to save her sister's life, he immediately agrees.
- Hiding the Handicap: He has vision problems that wouldn't be an issue in modern society, but in the stone world they limit his fighting ability. He doesn't let anyone know, even after Senku designs glasses for Suika because he doesn't want to "make excuses" for his weakness. However, during his fight in the tournament, Sulka gives him her mask in order to fight at full potential.
- Honor Before Reason: He's the only one on the heroes' side who doesn't agree that saving Ruri is worth cheating in the tournament. It bites him in the ass when he asks Jasper whether or not Suika giving him her glasses counts as interference; the moment he turns his back, Magma jumps up and cracks him over the head, knocking him out cold.
- He also claims that a man doesn't make excuses for his shortcomings, adamantly refusing to tell anyone that he has "blurry eye disease" (nearsightedness) and demanding that Ginro not tell anyone either.
- Not So Above It All: In order to befriend him and enter the village, Senku coats his spear in a gold alloy, claiming it suits him as "Kinrou" means "gold wolf". Though he claims he won't be won over by such a ridiculous gift, he decides to keep it after briefly fantasizing about how badass his new spear looks.
- Later on when the scientists begin automating their work, Ginro enthusiastically celebrates the fact that they'll never be asked to do that kind of back-breaking work ever again. Kinro celebrates too, but stoically.
- The Stoic: Rarely changes expression, and remains firm in following the rules of the village.
- Stoic Spectacles: Senku eventually makes him some proper glasses to wear.
- Those Two Guys: With Ginro.
- Took a Level in Badass: Senku fixes his eyesight problems eventually with a pair of glasses.
Voiced by: Ayumu Murase
A fighter and guard of the village, unlike Kinro, he is much more lax in his duties, and will try to get someone else to do his work if possible.
- Attractive Bent-Gender: Much to his horror, when forced into a dress and makeup he's cute enough to be immediately selected for the Head's harem, despite trying to show an unattractive personality. He was apparently a much easier pick than Kohaku.
- Brutal Honesty: Unlike Kinro, he is openly sincere about being a coward.
- Big Damn Heroes: In Chapter 32, he manages to save Chrome from the sulfuric acid at the last second.
- Butt-Monkey: Whenever there's some hilarious, general misfortune to be had, 9 times out of 10 Ginro is the unlucky victim.
- Changed My Mind, Kid: Initially refuses to return to the sulfuric acid spring, until he realizes that he can't live with himself if his friends get hurt because of his cowardice and rushes back just in time to same Chrome from falling in.
- Charles Atlas Superpower: Though he's not as strong as Kohaku or Kinro, Ginro too is much stronger than he looks.
- Dirty Coward: And damn proud of it. Turns out to be a Cowardly Lion in chapter 32 though, when he sets aside his fear to back up the less physically capable Senku and Chrome. After learning that Ruri will accept anyone who wins the Tournament, his "scum" part of his is unleashed to stop Senku and Chrome for winning the tournament, but is kicked in the nuts, much to everyone' joy.
- Made even more apparent when the Perseus sets sail. Ginro refuses to join the crew, terrified at the prospect of going on such a dangerous voyage. However, his scum part returns and he pretends to swim out after the ship in order to make all the girls who stayed behind believe that hes actually brave. However, that winds up backfiring badly.
- The "lion" part returns in full force as well though. Ginro wants very badly to escape, but finds that he simply annot leave Kinro to the fate of petrification, and so he turns to work with Suika to free the mobile lab for Senku.
- Hoist by His Own Petard: When the Kingdom of Science completes the Perseus, Ginro is amongst those selected to board it. However, he is adamant about not wanting to go on such a dangerous journey, and even has a panic attack until hes reminded that he has the option to refuse, which he does. However, upon the Perseus departure, Ginro throws himself into the water and swims after it, calling out that he wants to go after all. Its revealed that its all an act to look brave in front of all the girls who stayed behind, and increase his stature with them. However, hes caught on Senkus radar, and brought on board by Taiju, resulting in Ginro being dragged into the very voyage he wanted to avoid.Ginro: Wow...Science is amazing...an amazing pain in the ass.
- Peek-a-Bangs: To show that he's shy, but when Chrome almost died made him look pretty badass.
- Screw This, I'm Outta Here!: His "secret technique," is to run away from a fight and make it someone else's problem.
- The Slacker: Not very interested in his duties as a guard, especially noticeable in comparison to Kinro.
- Those Two Guys: With Kinro. Kinro is the serious type, Not So Above It All type, while Ginro is the Dirty Coward of the duo.
Voiced by: Reina Ueda
Kohaku's older sister, and the shaman of her village.
- Accidental Marriage: Because Chrome passes out from the injuries he sustained fighting Magma, Senku (who was planning on throwing his match to Chrome) ends up winning the village games and marrying Ruri. However, thankfully, he also became the village chief as a result of his victory... giving him the right to divorce Ruri on the spot not 5 minutes after "marrying" her. Ruri, naturally, was dumbfounded by the whole thing.
- Buxom Is Better: Ginro and Chrome certainly think so, when compared to her sister.
- Dude Magnet: Chrome, Magma, Ginro, and Kinro all show interest in her at one point or another. She has to marry Senku at the end, ironically.
- Hartman Hips: Even shapelier than Kohaku's.
- High Priestess: Serves this role to the village.
- Ill Girl: At the start of the series, she is suffering from an unknown illness. It's 15-years long pneumonia.
- I Never Told You My Name: She knew Senku's full name all along, because the 100 Tales were authored by his father Byakuya, and the 100th tale was a farewell message directed specifically at Senku.
- Strong Family Resemblance: Looks almost exactly like her younger sister◊, which Kohaku herself candidly points out when she jokingly asks if Chrome would fall in love with her next.
- The Storyteller: The villagers have learned some stories from the Pre-Stone World through her. Including a hilariously out of place Fist of the North Star parody.
- Tomboy and Girly Girl: With Kohaku, but due the fact that she's really frail. After her pneumonia is cured, she goes for a run at full-speed, demonstrating that both sisters can be pretty tomboyish (though she's still far girlier than Kohaku).
Voiced by: Karin Takahashi
A child wearing a watermelon mask who ends up one of Senku's allies.
- All of the Other Reindeer: Implied to be an outcast due to her behavior.
- Be the Ball: She can curl up completely inside her mask and roll around at high speed.
- Because You Were Nice to Me: Becomes loyal to Senku because he was the first person who didn't ask why Suika wears a melon on her head... not realizing that he wasn't respecting her privacy, he just doesn't care.
- Blind Without 'Em: Her vision starts blurring only about a foot from her face. Her Suika Cap makes this better, and then Senku converts it into glasses...
- The Faceless: Is mostly seen wearing her mask.
- Gonk: While she's plenty cute underneath the watermelon mask, without it she tends to squint so hard to see that her entire face wrinkles up and she looks like an old woman.
- Meganekko: The reason she wears her mask is because it focuses light so she can perceive it better, as she is very near-sighted. Knowing this, Senku's able to make glasses using her mask as the frame.
- Odd Name Out: The villagers are generally named after gemstones, minerals and other elements. Then there's Suika, which literally means "Watermelon". Justified due to it being a nickname.
- Only Known by Their Nickname: "Suika" isn't her real name, just a nickname referring to the mask she wears.
- Snooping Little Kid: Using her Suika cap as a disguise, she's able to easily listen in on conversations. She's also one of the more observant members of Team Science, shown by how she figured out that Kinrou needed glasses after only a few minutes watching his fight with Magma
- The World Is Just Awesome: Gets a moment like this after Senku puts corrective lenses into her mask, allowing her to really see the world and people around her clearly for the first time. He even went to the effort of making sure that her first sight would be a beautiful field of sunflowers.
Voiced by: Kengo Kawanishi
A strong, power-hungry man in Kohaku's village.
- Arc Villain: Of the Tournament Arc.
- Character Development: As noted, he's the Arc Villain of the manga's first story arc, more than willing to kill anyone who gets in the way of his plans to become village chief (including a sick girl who probably won't last more than a year or two anyway). After getting humbled in the tournament and witnessing the amazing things science can create, he develops a grudging respect for Senku and puts more of a rein on his ambition. Tellingly, in Part 3 when Mantle suggests killing Senku, Magma looks angry for a second but then dismisses it by saying Senku is far too interesting a person to kill.
- Dumb Muscle: Magma isnt very bright but hes still the strongest villager physically in Ishigami Village, which makes him perfect for jobs that require a lot of strength like mining ore.
- HeelFace Turn: Though he continues to harbor his ambitions to some day rule over the village himself, the products of science that Senku and company bring to the village impress him enough that he's willing to cooperate to see what might come next. The threat to the village posed by Tsukasa's army helps too.
- Hypocritical Humor: When he, Chrome, and Gen are cornered by Ukyo, he proposes that Chrome absorb the arrows so they can find their assailant and take him down. When Chrome naturally refuses, Magma calls him selfish.
- Jerkass: Said out loud that he doesn't mind if Ruri dies, and that it would even be convenient for him if she did so as soon as possible just as long as he gets to marry her and become the village's chief first.
- Jerk with a Heart of Gold: However, he can't bring himself to kill Chrome or Senku when he has the chance, even saving Senku at first during their trip to the cave. He was also in on Gen's birthday plot.
- Jerk Jock: Strongest man in the village, and a complete tool. He gets a little better later on.
- Lantern Jaw of Justice: Has a prominent one, though he's anything but just.
- Murder by Mistake: Very nearly does this to Gen. After seeing him perform a magic trick, he assumes that Gen is the "sorcerer" helping Kohaku and ambushes him. It's only averted because Gen was Properly Paranoid.
- Reformed, but Not Tamed: His personality and ambitions remain essentially the same even after becoming an ally.
- Sitcom Arch-Nemesis: Ends up in this dynamic with Yo after the two tribes merge.
- Token Evil Teammate: The first one to suggest that Murder Is the Best Solution. When he, Gen and Chrome come across a large number of petrified people Tsukasa is planning to revive and recruit for his army, Magma bluntly states they could simply smash the statues or hack off their limbs. Chrome and Gen then lampshade that Magma in similar to Tsukasa in this regard, and they're glad that he's on their side.Magma: Huh? What do I care about this buncha strangers?
Voiced by: Mugihito
An elderly craftsman who gets drafted into helping Senku's group make glassware.
- Cool Old Guy:
- Offers Ginro some solid advice about not being ashamed of his fears, and "just happened" to have made an extra gas mask in case "someone" wanted to go help Senku and Chrome collect sulphuric acid.
- Once his creative fire is lit, he tears his way out of the ropes Chrome has him tied up with and reveals an extremely muscular build.
- Later, when Chrome comes up with an idea and tells it to Kaseki, he literally goes Super Saiyan with excitement.
- During the ship-building arc, he enters one scene in Senku's automobile, wearing a very nice suit and looking to all the world like some kind of Dwarven pimp.
- Intergenerational Friendship: With Senku and Chrome, over their mutual love of science and invention. At one point he laments the fact that he never had friends like them while growing up, but the two boys reply that age means nothing and affirm that they do consider Kaseki a friend, which makes him break down in Manly Tears.
- Running Gag: His muscles bursting his clothes off whenever he gets fired up about building something.
- Ultimate Blacksmith: Stone age variant since he's spent almost his entire life in a pre-metalworking culture, but understands crafting techniques so well that just by watching Senku and Chrome fumble around with it, he's able to perfectly make a glass bottle on the first try.
- Later played straight once Senku gets him access to a metal forge.
A nameless villager of Ishigami Village who is actually of another village overseas as he was drifted apart from his parents when he was a baby. He knows about the island that has the Soyuz spacecraft.
- Chekhov's Gunman: The nameless villager among the Ishigami Village ends up playing a major role in the hunt for the Soyuz spacecraft, and is named after it.
- Hammer and Sickle: He possesses this tied to his belt.
- The Reveal
- Chapter 100 reveals that he is actually a descendant of the non-Petrified from the island outside of Ishigami Village, and that said island is inhabited with descendants of the astronauts who evacuated the International Space Station in their Soyuz spacecraft.
- Chapter 104 reveals that Soyuz remembered that when he was a baby, his parents to flee from a Petrification beam, leading to him drifting to Ishigami Village without his parents. This means there is a resistance against the ones who are using the Petrification in his home village!
- Odd Name Out: He's the only person from Ishigami Village whose name has absolutely nothing to do with earth sciencesnote ; when he reveals his name to Senku, he admits that he just went nameless for most of his life because his real name stood out.
- Photographic Memory: He possesses an incredible memory, recalling details as far back as his own infancy; (which Kohaku and Gen rightly call impressive). In Chapter 117 when Ryusui is preparing to de-petrify Taiju, he realizes that the latter is missing one of his arms and they need to recover it first...but Soyuz already has the arm, having seen it when they were swimming to the villagers' location.
- Walking Spoiler: When he's first introduced, we don't even know his name, and he doesn't do much until much later, where it's revealed that he's from another inhabited island.
A small, weaselly supporter of Magma.
- Blatant Lies: At the start of the tournament, he tries to take Kohaku out of the competition by claiming that he saw Suika drowning so that Kohaku will have to go rescue her. Everyone present points out how obvious a lie this is.
- Lazy Bum: When Suika goes to check on him while he's guarding Homura's prison, he's nowhere to be found and she assumes he ran off to take a nap — again. Subverted when it turns out Yo tied him up and freed Homura, but then double subverted when flashbacks show that he was napping when Yo showed up.
Kohaku and Ruri's father and chief of the village. Often gets fed up with his younger daughter's antics.
Tropes that apply to all of them
These are the people who survived the stone incident ~3,723 note years ago. So far, all of the known survivors were astronauts who were aboard the International Space Station when the stone explosion occured, thus sparing them from pertrification; they subsequently returned to Earth in a pair of Soyuz spacecraft.
- Adam and Eve Plot: There were only six people aboard the International Space Station during the stone incident- three men and three women- so they presumably got to repopulating the planet after they landed from space. It would definitely appear that way at least, as both Senku and Tsukasa point out that Kohaku appears to have foreign blood in her despite being in Japan... and sure enough, at least four of the astronauts appeared to have been Caucasian.
- Posthumous Character: Having not been turned to stone, they're all obviously long-dead by the time the series picks up nearly 4,000 years in the future. More specifically, chapter 45 reveals that most of the astronauts were eventually killed by Pneumonia.
- Strong Family Resemblance: Some of the villagers more closely resemble their distant ancestors than others.
Voiced by: Keiji Fujiwara (Japanese), Kent Williams (English)
- Wait to be rescued? You've got it totally wrong... we're the ones that are going to do the rescuing! For the entirety of humanity... All 7 billion of them!
Charming and mischievous, Byakuya was one of the astronauts stationed aboard the International Space Station during the stone incident.
- Adaptational Dye Job: His hair color isn't entirely consistent in illustrations, but Senku and Byakuya tend to share the same hair color. In the anime, Senku is blond with green tints while Byakuya's hair is entirely white.
- Celebrity Survivor: As an astronaut, he was popular and well-known enough in Japan for the kids in Senku's class to instantly recognize him just by hearing his name.
- Chick Magnet: The girls in Senku's class and the reporter doing the live coverage on the day of the launch were all smitten with him. He eventually got together with Lilian and had children with her upon landing back on Earth, as well.
- Determinator: Byakuya spend his entire life after returning to Earth preparing it for Senku's return. Just leaving the stories and clues for Senku and believing he would be there in the future to make use of them would qualify Byakuya for this trope, but in Chapter 115, we see that he literally spent the rest of his life gathering rare metals that would help Senku in the future, finally dying of old age while panning for gold in a river. And his efforts paid major dividends, as he was able to collect an astonishing amount of platinum from that single river.
- Fling a Light into the Future: He came up with the 100 stories of Ishigami village, both as a way to teach future generations about how to survive and to ensure that Senku would have allies to help him rebuild the world. He also made sure he was buried with a time capsule containing a record that plays out a message for Senku and a song for the villagers in case Senku couldnt convince them to help him restore humanity.
- Good Parents: He and Senku had a pretty healthy father-son relationship, Byakuya selling his car to buy Senku a lab in order to foster his early interest in science, and including a farewell message in the 100 Stories. He also quite literally works himself to death gathering materials for Senku in the future.
- Meaningful Name: His surname means stone-god. In fact, it's arguably even more appropriate for Byakuya than Senku, as Byakuya was quite literally the first leader of the Stone World.
- The Reveal:
- Byakuya is Senku's father and the founder of the village, and he even passed on legends about Senku himself down the royal line. This is why Ruri knew Senku's surname before he even told her.
- However, it's also revealed shortly thereafter that he and Senku are not blood related.
- Shared Family Quirks: Like Senku, he was a bit of a Troll; the first thing he does when he goes to space is convince Lilian to act like a diva just to annoy everybody, and then he teases her by playing her music on the station against her wishes.
- Neither of them cares much for ceremony either; his recorded message to Senku starts off sounding completely serious before he cracks up and says that this mushy stuff isn't their style. Senku likewise laughs and says "He gets me!"
- Walking Spoiler: It's hard to know too much about him without putting it together that he's Senku's father and the founder of Ishigami village.
A Westerner, Lilian was a famous pop-star who paid 50 million dollars to go to space along with 5 astronauts, presumably for promotional purposes.
- Celebrity Survivor: She was a pop-star before the stone incident, even broadcasting a live-performance to her fans on social media from space.
- Impossible Hourglass Figure: Has it in spades.
- Luminescent Blush: Once her true Nice Girl nature is revealed.
- Nice Girl: After doing her diva prank, she apologizes and gives the rest of the crew a very warm welcome, showing that she's actually a nice person.
- Rich Bitch: In her first scene she enters the International Space Station and starts throwing a tantrum about how uncomfortable it is and how she deserves special treatment because she's rich and famous...and then Byakuya cracks up and Lilian chastizes him for ruining the prank too early.
- Southern Belle: Implied, since according to Nicky she had a "subtle Southern accent".
A snarky, deadpan Western astronaut who was on board the International Space Station.
- All There in the Manual: His surname doesn't appear in the story proper, but on the splash page for Chapter 43, which shows the six astronauts in their spacesuits, his nametag visible.
- Deadpan Snarker: Byakuya even compares him to his son Senku, calling him a "snotty smart-aleck".
- The Stoic: Doesn't emote much beyond "mildly annoyed" and ''quite annoyed", though he was stunned when he witnessed the stone explosion on Earth.
They are another group of non-petrified humans from outside the Kingdom of Science and Empire of Might. It's implied that they not only have technology like the villages, but also implied that they are connected to the source of Petrification. They are dubbed Whyman for repeatedly saying WHY in Morse Code after detecting Senku's broadcast.
- Greater-Scope Villain: Implied to be this due to their connection with the Petrification and actually using it.
- Madness Mantra: They repeatedly said WHY in Morse Code after sensing Senku's broadcast on their frequency.
- Technologically Advanced Foe: They are implied to be as if not, more technologically advanced than the Kingdom of Science led by Senku.
- Walking Spoiler: It's hard to discuss them without the revelation of not only walking around with tech knowledge like Senku but also implied to be behind said Petrification of the Earth for several Millennia.
She's dubbed the most beautiful girl of the Treasure Island Senku and others visit to find the Soyuz spacecraft.
- Dude Magnet: She can attract any guy she shows affection to on the island. Despite using her looks to sway all guys to loving her so she can get married to the Head's harem, Senku not being affected comes to her shock.
- Honey Trap: Her goal is to get married to the Head and kill him to stop him from petrifying people.
The prime minister of the tribe living on "Treasure Island". He runs things cruelly, demanding a harem and turning people to stone if he doesn't get what he wants.
- Arc Villain: He isn't the "head" of Treasure Island, but as the head's top advisor he's the most prominent authority opposing the Kingdom of Science.
- Dirty Old Man: Though unimpressed with Kohaku's attitude, he accepts her solely on her curves and even reaches out to grab her chest. Kohaku nearly breaks his arm but is stopped by his bodyguard Mozu.
- Eagle-Eye Detection: Has a keen eye for details. On the Perseus, he suspects something is off about the barrel that Ginro is hiding under because he notices that the barrel has moved at least a pinkys width. Later on, when Kohaku opens the treasure chest left behind by the astronauts, one of the guards brings him the remaining rubble, and he notices a piece of glass amongst all the chunks, leading him to guess that there are intruders amongst the members of the most recent harem selection.
- Properly Paranoid: He suspects that there are intruders on the island and has been on high alert. He's right.