Kohaku (コハク ) is a young woman who is a descendant of modern humans. She is Ruri's younger sister and the daughter of Kokuyo. She is one of the protagonists of the series.
After meeting Senku and witnessing his bravery, courage and talent, Kohaku invites him to her village. Since Senku assists and fascinates the village with many of his scientific inventions and turned out to be the savior the village ancestors talk about in the stories that are passed down, the population is ultimately rallied to fight and stop Tsukasa's tyrannic empire.[14]
After Taiju, Kohaku is the most loyal to Senku. Since learning about science and the delicate/complicated work it takes to make modern inventions, Kohaku often teams up with Chrome to scavenge ingredients and "persuade" Kinro and Ginro to help with the labor.
Contents
Appearance

Kohaku is a young woman of average height with a slim figure. She has a delicate face, blue eyes, and blonde hair tied-up in a spiky ponytail. Her appearance is that of someone who appears to be a mixed heritage of American/Japanese[14], denoting her heritage as the descendant of Byakuya Ishigami and Lillian Weinberg. She shares a resemblance with her older sister, Ruri, but has wild hair in comparison to her sister's soft, flowing hair, and a slimmer body. Her clothing consists of a V-neck, sleeveless and short navy blue dress. Underneath she wears makeshift garments akin to a bra and a fundoshi (traditional Japanese garment). The dress is tied with a rope tied in the middle, and uniquely shaped stone sandals.
While helping Senku gamble against Ryusui and Gen on the trip to America, Kohaku donned a modernized party dress, complete with tights. The dress was long and flowing with slits in the side for her legs' freedom; it had a sparkly pattern with the color fading at the bottom. It lacked sleeves with the top of the dress ending with it being secured behind her neck with a tie.
Later, her shield transitions from her original wooden one to a fully metal one made by Senku.[15]
Personality
Kohaku is a kind young woman, caring deeply for her sickly older sister, willing to participate in the tournament for her hand in marriage just to protect her. This care extends to her comrades, and anyone she's loyal to. Other than her sister, she is particularly dedicated to Suika, playing for her the role of an older sister herself. She was willing to lie and take scolding in order not to reveal she was attacked by Tsukasa as not to distress her sister and the villagers.[16]
Despite her great sense of compassion and dedication, or perhaps, in addition to it, she has a choleric and impulsive personality that makes her burst in rage or carry out reckless actions. This in addition to her tomboyish nature is often the object of mockery from people such as Chrome and Senku, calling her names such as "gorilla" or "lioness", leading to a strong reaction and often violence. She was notorious for jumping into conclusions and into action without putting much thought into her decisions, which could potentially lead her into fatal mistakes; however she has improved on this regard, mostly learning from Senku to think twice before action. Illustrating her confidence, she has the habit of starting sentences with a stern 'Hah!' when being assertive.
Kohaku's stance towards people she distrust is completely different to those she does trust. During the early part of the story, she'd always be wary of such people and ready to attack them given just a sliver of a motive. Senku went through this initially with her refusing to let her guard down and sleep with Senku nearby. Likewise was her first impression of Gen, who admitted to being initially a spy for Tsukasa[17], this prompting an actual reaction and threats from her.
She also possesses a strong sense of justice, which in pair with her hotheadedness leads her into dangerous situations such as her battle with a more competent fighter like Tsukasa, whom she decided to attack after witnessing him killing Senku, not being concerned with whichever motives he might've had. [14] Thanks to Senku's numerous scoldings and encouragement to think more than one step ahead, Kohaku grows out of this habit, but her temper is still a problem.
She's repeatedly impressed by Senku's scientific creations, although at first, it took her a while to accept that it's not simply magic.
Kohaku excels at fighting, hunting, and general survival skills. She is a tomboy by nature, having little interest in more typical feminine activities and has little knowledge about them, although she does seem to enjoy some lavish clothing that was provided to her. Kohaku has no problem with being around boys while swimming or changing clothes; she will, however, retaliate if a boy stares lustfully at her breasts. She possesses a sharp instinct and intellect.
Perhaps because of her instinct, Kohaku seems to be a good judge of character.[17] She was able to deduce that Gen was the kind of person who, despite being able to lie without batting an eye and claiming to only work for his self-interest, cherished his loyalty and friendship with Senku. She also recognized that Chrome was in love with Ruri, but hadn't realized his own feelings yet, and was able to read Senku's personality to an extent.
Similar to Senku, she doesn't seem to be greatly interested in romance, previously claiming to have fallen for Senku when she meant that she found him interesting as a person. She will however tease people she's comfortable with, such as offering herself to Chrome as a substitute for her sister early on, or offering a hug to Gen when he attempted to lure Amaryllis into doing so, without success.
Despite all, she does seem to foster some degree of feelings for Senku, at least after knowing him for longer. She is known to loathe men who are selfish or shallow, such as how Gen appeared early on. Later she would state that she likes "Men, who for what they believe in, will keep putting one foot in front of the other, for all eternity, chipping away at progress"[18] or to put it short, a description of her impression of Senku. They also have other moments such as her hugging him upon reuniting, or admitting that she finds him attractive. regardless of how deep these feelings may be, she is pragmatic enough to not act on them for the moment, preferring to do what she can to further the restoration of humanity and the defeat of Why-Man.
Abilities and Skills

Kohaku's swift strikes.
- Enhanced Physical Prowess: Kohaku appears to be well known in her village due to her combative abilities, as both Kinro and Ginro were afraid of her.[19] Tsukasa, a world-class fighter, stated that she would have been famous for her fighting abilities back in the Pre-Petrification world[14]. Kohaku possesses great strength and endurance, credited by Chrome to be one of the few superhumanly strong individuals within the village, being able to carry a heavy pot filled with hot water on a daily basis for her sickly older sister, Ruri. In an extra, Kohaku rates herself with 1000 battle points, Kinro having 500 and Ginro having 100 respectively.[20] Despite her skill, she is inferior to Tsukasa Shishio, Hyoga, and Moz; Tsukasa had proper marital art training, Hyoga is a spear expert and Moz is simply better-muscled. She does however seem to perfectly match Kirisame in fighting skills.
- Enhanced Strength: She is tasked with carrying a heavy pot filled with hot water over long distances on a daily basis for her sickly sister Ruri, Senku noting it's just shy of 50 kilograms (which is around 110 pounds).[19] When Senku tries to lift the pot in order to help Kohaku, he quickly succumbs to its weight; granted Senku is incredibly weak in comparison, but for anyone to carry 50 kilograms a long distance without tiring is amazing feat.
- Enhanced Speed: Her more notable traits are her speed and agility, which makes her highly proficient in close-quarters combat. When fighting, she attacks with a flurry of blades and kicks. She also possesses quick reflexes, as she was able to easily stop an attack from Kinro and Ginro when they both attacked her. Because of her speed, the two of them fear her wrath. Naturally she also excels when it comes to plain running, only being matched by Homura in this regard. Aboard the new Perseus, she observed that the ship seemed to be on par with her top speed on land, according to herself.[21] The ship had been previously stated to have a top speed of 20 knots[22], or 37 kilometers per hour.
- Enhanced Senses: In addition to all this, Kohaku is gifted with incredible eyesight. She first noticed something is off about the North Star not being true north[23], being able to spot Tsukasa and Senku from afar, and finding oil from just a crude aerial photo taken from a hot air balloon. However, she was unable to sense Kirisame in their first fight. Matsukaze even blitzed right through her, without her noticing.
- Hunting: Kohaku is an accomplished hunter. She caught a wild boar for Francois with ease when they were looking to capture some for their farm. She's one of the most reliable people when it comes to hunting. Additionally, her extraordinary eyesight helps in all these endeavors.
- Instinct: Perhaps because of her experience in hunting, Kohaku possesses a sharp instinct, able to discern information and situations correctly.
- Intelligence: While not as smart as Chrome or skilled as Kaseki, she proves to be quick on the uptake in an understanding of some of the science Senku demonstrates, and the complex strategies they use in their endeavors, like her covert acts to send Senku supplies and critical information despite the lack of 2-way communication and her illiteracy. She also used a coded word to get her allies' attention, during an enemy attack.[24] When Ginro was severely wounded, she realized that in order to save him, she would have to petrify him and did so by threatening to reveal Ibara's secret.
Equipment
Kohaku wields two primitive-looking knives and an orange-colored buckler, the shield her father gifted her as a child. Later, she discards her dual knives in favor of the katana that Kaseki and Senku forged for her and the other warriors.[25] After her shield is repurposed a gear, it is replaced with a metallic one.
While infiltrated at Treasure Island, she was instead equipped with a wireless earpiece (a crystal radio made to look like an earring) and a bladed weapon concealed in the form of a thigh strap.
After being depetrified for the second time, she goes back to using duel wield knives with her shield attached to her back.
Stats
Power | 3/5 C | |
---|---|---|
Speed | 5/5 A | |
Technique | 3/5 C | |
Reach | 2/5 D |
Chapter Appearances
Trivia
- Her name is the Japanese word for amber, which is fossilized tree resin.
- In the cover of Chapter 17, her eyes were mistakenly shown as yellow/brown, even though it was stated that she has blue eyes. This mistake was later fixed with the cover of Chapter 22.
- Kohaku ranked 2nd in the 1st Character Popularity Poll.
- She was close to rivaling with Gen, who ranked third place.
- She is the first girl to kiss Senku.[26]
- Kohaku only hits Chrome (and occasionally Ginro) for calling her a gorilla, even when Senku does the same.
- Senku did however get a roughening from her in the side story accompanying Chapter 18.
- After the second global petrification, Suika remade Kohaku's shoes with knots like hers, since she is her best friend.[27]
- She was originally two years younger than her older sister but after the second petrification event, the pair are now the same age.
References
- ↑ Dr. Stone Manga: Volume 22 — Extras
- ↑ Dr. Stone Manga: Volume 4 — Q&A
- ↑ Dr. Stone Manga: Chapter 212
- ↑ 4.0 4.1 Dr. Stone Manga: Chapter 178, Page 18
- ↑ Dr. Stone Manga: Volume 19 — Extras
- ↑ Dr. Stone Manga: Chapter 121, Page 19, Kohaku is petrified along with Ginro.
- ↑ Dr. Stone Manga: Chapter 138, Page 10
- ↑ Dr. Stone Manga: Chapter 192, Page 21, Kohaku is petrified along with the rest of the world.
- ↑ Dr. Stone Manga: Chapter 197, Page 4, Kohaku is revived by Suika.
- ↑ Dr. Stone Manga: Chapter 223, Page 12
- ↑ Dr. Stone Manga: Chapter 224, Page 13
- ↑ Dr. Stone Manga: Chapter 226, Page 4
- ↑ Dr. Stone Manga: Chapter 226, Page 7
- ↑ 14.0 14.1 14.2 14.3 Dr. Stone Manga: Chapter 16
- ↑ https://www.youtube.com/watch?v=1goTZiKOk_g [Boichi, PLZ draw this!] A Queen and beauty, KOHAKU AND AMARYLLIS!
- ↑ Dr. Stone Manga: Chapter 19
- ↑ 17.0 17.1 Dr. Stone Manga: Chapter 23
- ↑ Dr. Stone Manga: Chapter 121, Page 4
- ↑ 19.0 19.1 Dr. Stone Manga: Chapter 18
- ↑ Dr. Stone Manga: Chapter 22
- ↑ Dr. Stone Manga: Chapter 201, Page 3
- ↑ Dr. Stone Manga: Chapter 200, Page 16
- ↑ Dr. Stone Manga: Chapter 20, Page 13
- ↑ Dr. Stone Manga: Chapter 107, Page 14
- ↑ Dr. Stone Manga: Chapter 48, Page 5
- ↑ Dr. Stone Manga: Chapter 107, Page 17
- ↑ https://www.youtube.com/watch?v=EZQLCsjJDsI [Boichi, PLZ draw this!] Sai and Ryusui Brother and kid and youth Suika
Male | Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Soyuz • Tetsuken • Titan • Unmo |
---|---|
Female | Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise |
Unknown | Chalk • Sagara |
Male | Chrome • Gen Asagiri • Ginro • Hyoga • Joel Gear • Kaseki • Kinro • Kokuyo • Magma • Matsukaze • Moz • Ryusui Nanami • Sai Nanami • Senku Ishigami • Taiju Oki • Tetsuya Kinomoto • Tsukasa Shishio • Ukyo Saionji • Yo Uei | |
---|---|---|
Female | Chelsea Childe • Homura Momiji • Kirisame • Kohaku • Minami Hokutozai • Mirai Shishio • Nikki Hanada • Ruri • Suika • Yuzuriha Ogawa | |
Unknown | Francois • American Colony • Ishigami Village |
Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Tetsuken • Titan • Unmo | ||
Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise | ||
Soyuz's father • Ibara • Matsukaze • Moz • Oarashi • Soyuz | ||
Amaryllis • Kirisame |