Zenitsu Agatsuma is one of the main characters in Demon Slayer: Kimetsu no Yaiba and is a traveling companion of Tanjiro Kamado and Nezuko Kamado, as is Inosuke Hashibira. He is also part of the Demon Slayer Corps as a demon slayer.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba

I despise myself more than anyone. I always feel like I need to get my act together, but in the end, I retreat into myself, run away and start whining. I want to change. I want to become a competent person. This is Zenitsu Agatsuma’s desire for self-improvement in “You Must Master Only One Thing.”

Appearance

Zenitsu is a medium-sized, fair-skinned boy with frightened, downward-slanting eyes that turn from soft brown to golden. He has short, yellow hair of varying lengths, cut straight at the ends where it turns a darker shade of orange, falling back in front of his face in an irregular fringe. Before becoming a demon slayer, Zenitsu’s hair was originally black, but it took on its current color when he was struck by lightning during training.

After the battle of Mount Natagumo, his limbs temporarily shrank due to the poison of the demonic spider (Son), but they were able to return to their normal size thanks to the medicine given by Shinobu Kocho.

He wears a lighter version of the standard demon slayer uniform, consisting of a dark brown gakuran jacket, a white belt around the waist and spreading hakama pants, as well as his distinctive haori with patterns of gradient white, yellow and orange triangles. In addition to this, Zenitsu also wears a pair of Kyahan tied at the front with three white bows, featuring the same pattern as her haori, light brown tabi socks and white lace-up zōri.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu with his original hair color
Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu as Zenko

Personality

Zenitsu is often perceived as a coward, as he frequently claims that he doesn’t have long to live due to the danger inherent in being a demon slayer. Despite his strength, he has low self-esteem and even considers himself useless. For example, he couldn’t believe he’d killed a demon and mistook it for Shoichi, a young child with no special demon-slaying skills. Zenitsu lives in constant fear and cries easily, always seeking to flee as soon as he is confronted with danger. He says he wants to lead a simple, normal life rather than that of a demon slayer. This attitude leads Zenitsu to shout and scream frequently, which can annoy those around him. He can also be pessimistic, particularly during the Hashira training arc, where he lashes out at Tanjiro and Inosuke, who take a more positive approach to training.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu dragging Shoichi EP11

However, despite these weaknesses, Zenitsu always aspires to meet the expectations of others and gives his best when necessary. He has deep respect and admiration for his comrades and his late master, Jigoro Kuwajima. His inner focus and determination to avenge his master help him overcome cowardice and self-doubt when he finds himself in difficult situations. Zenitsu also hates himself for his cowardice and lack of skill, sincerely striving to improve.

Furthermore, Zenitsu is presented as a seducer, motivated by the fear of remaining single should he die. He tends to flirt with girls he finds cute and asks them to marry him, much to their dismay. This seductive side overcomes his docile personality, especially when he thinks his classmates are “flirting” with attractive girls. He is then prone to long bouts of hysteria and complains profusely. Zenitsu seems to have a strong attraction for Nezuko, openly expressing his affection for her and always instinctively rushing to protect her. At such times, he can also be physically aggressive out of frustration. However, Zenitsu shows respect for women, intervening, for example, when Daki has almost bitten off a girl’s ear, asking him to leave the girl alone and then inviting her to apologize.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu falls for Nezuko. EP15

As the only boy in the trio to have grown up in the city, Zenitsu has a better understanding of how the city works, and often finds himself embarrassed by his companions’ naiveté.

Before the assault on Infinity Castle, Zenitsu emanates a different, more serious aura, as if fully focused on something important. This change occurred after he received a letter from Chuntaro, revealing his master’s death and Kaigaku’s role in it. During his confrontation with Kaigaku, Zenitsu shows himself to be stern and full of anger, violently cursing him for disrespecting their master. His sudden transformation surprises his former superior, as Zenitsu reveals a more mature personality, contrasting with his usual cowardice.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu’s determination for training

Skills

General skills: right from the start, Zenitsu reveals himself to be a talented and skilled demon killer, even if he denies it. Zenitsu’s true strength manifests itself when he’s asleep, for it’s then that his nervous inhibitions, which normally prevent him from accessing his true power, relax. This makes him more astute, calm and precise in battle, enabling him to instantly decapitate the Tongue Demon and defeat the Spider Son Demon on his own. He then successfully defended three wagons attacked by Enmu, a lower Rank 1, in the company of Nezuko. A few months later, he was able to face an awakened Daki with Inosuke’s help, and finally defeated her using his “Thunderclap and Flash: God Speed” technique. As further proof of his strength, Zenitsu managed to reach the pinnacle of Hashira training.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Honoikazuchi no Kami

However, Zenitsu’s true power seems to manifest itself when he’s fully awake. He managed to rival in power Kaigaku, the new Rank Six Superior, and promptly shot and decapitated him before the latter could even react, despite the severe injuries he had sustained. However, feelings of regret and melancholy were the only things that prevented Zenitsu from immediately killing Kaigaku, his former superior. What’s more, he was able to follow and fight the Demon King, Muzan Kibutsuji, even though he was considerably weakened by anti-Kibutsuji medication. It is therefore highly likely that Zenitsu’s power is now comparable to that of the Hashira at the end of the series.

As for her enhanced hearing abilities, Zenitsu possesses an extremely developed sense of hearing that enables her to detect danger in even the faintest sounds. Thanks to his superhuman hearing, he has demonstrated his ability to discern successive layers of sound, whether in a brothel or even Infinity Castle. He can also perfectly reproduce any tune he hears on a Shamisen and Koto after hearing it just once, achieving perfect pitch despite his lack of musical training. Zenitsu’s extraordinary hearing also enables him to fight in his sleep, an impressive feat as he has no visual aid and can rely solely on sound to apprehend his surroundings and react to demon attacks.

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Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu puts his hearing skills to the test.

As for his extrasensory perception abilities, Zenitsu’s hearing enables him to hear and pick up sounds beyond the normal range of perception. He can detect a person’s thoughts, emotions and even personality by picking up on the subtleties of the sound they emit. What’s more, it can distinguish between a human and a demon by comparing the sounds they produce, which also enables it to assess their strength to a certain extent. For example, Daki, a demon of higher rank, emits a more terrifying sound than ordinary demons, enabling Zenitsu to differentiate between them.

As for his enhanced physical strength, Zenitsu has reached an impressive level after years of intensive training. He’s able to overpower Inosuke Hashibira with his bare hands and throw his body around by grabbing him by one of his legs and swinging him around. Above all, Zenitsu possesses exceptional power in his legs, enabling him to make extremely high jumps and move at lightning speed to execute his thunderous breathing techniques. He has even managed to inflict damage on Muzan’s body, whose resistance is the highest among all demons, a testament to his superhuman physical strength.

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As for his speed and impressive reflexes, Zenitsu is extremely fast, able to move at a speed greater than that of the human eye. Even at the start of the series, when he was considered the weakest of the group, his speed enabled him to easily dodge the attacks of several demons such as the Tongue Demon and the Spider Demon, and then bring them down. During the Mugen Train Arc, he was able to save Nezuko from the flesh appendages of the lower Rank 1, Enmu, and slice through several of them before the latter could react.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu slashes Kaigaku’s neck

As he progressed, Zenitsu’s speed improved to the point where his movements were imperceptible to higher-ranking demons such as Daki and Kaigaku, the latter having amplified reflexes during combat and being a user of the same Breathing Style as Zenitsu. What’s more, Zenitsu could move faster than Kaigaku’s searing Blood Demon Art and slice through his neck before his attack could reach him. Even more impressive, Zenitsu could deliver several blows to the Demon King, Muzan Kibutsuji, whose speed was indiscernible thanks to his techniques, even though he was very weakened by then.

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With regard to his incredible stamina and endurance, Zenitsu demonstrated remarkable abilities. He was seen continuing to fight even after being affected by the deadly poison of the Spider Demon Son, which made him weaker and weaker and turned him into a spider. He was also able to defend 3 train carriages with Nezuko for a long period without showing any signs of fatigue. Later, Zenitsu fought Daki, a Sixth Rank Superior, alongside Inosuke, for a relatively long time, despite the many wounds inflicted by the demon and being trapped under rubble. Zenitsu still had enough stamina to unleash his Thunderclap and Flash: God Speed technique twice, once to free himself from the rubble and once to attack Daki.

He was able to continue fighting Kaigaku even after suffering multiple thunder-breathing techniques reinforced by the blood demon’s art, which burned his skin, and finally gathered enough power to use his ultimate technique and defeat him. Zenitsu was even able to fight for around half an hour in the battle against Muzan, surpassing his limit of only being able to use his Thunderclap and Flash: God Speed technique twice a day, before his legs gave way.

Given an indomitable will and spirit to slay demons, Zenitsu has demonstrated his determination. This was shown when he adamantly refused to let Inosuke kill the demon in Tanjiro’s box and protected it to the end, despite Inosuke’s relentless blows. Even when he was asleep during the fight against Daki, Zenitsu had the will to keep on fighting despite the numerous wounds all over his body and the fractures in his feet. Thanks to his determination and anger, Zenitsu was able to overcome his cowardice and stay awake when fighting demons, as evidenced by his confrontations with Kaigaku and Muzan. Particularly in the fight against the latter, he refused to give up and persevered despite the fatigue and injuries he was suffering.

Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
Zenitsu refuses to let Inosuke harm Nezuko

Tactical intelligence: Even when fighting unconsciously, Zenitsu displays remarkable judgment and tactical intelligence. When fully aware of his actions, this ability is even more pronounced. We saw this in his fight against Daki, the Sixth Rank Superior. As Inosuke made an erroneous deduction about their weaknesses, Zenitsu accurately explained that the key was to keep the two demons’ heads separated to kill them. In his confrontation with Kaigaku, he also demonstrated clear thinking as he analyzed his demonic techniques and abilities.

Unconscious fighting: Zenitsu possesses the ability to fight while asleep, allowing him to unleash his true strength. When awake, fear and nerves paralyze him, preventing him from reacting. When his life is in danger, his fear becomes so intense that he faints. However, when he’s asleep, these nervous constraints disappear, enabling him to fight with judgment, precision and skill. His hearing plays an essential role in his ability to fight unconsciously, enabling him to perceive his surroundings, the position of his enemies and their attacks. It also enabled him to continue fighting even after being exposed to Enmu’s sleep effect, which plunged everyone into a deep sleep.

Battle style

Sword mastery: Zenitsu is an incredibly skilled swordsman, thanks in particular to his mastery of extremely fast sword techniques such as Iaijutsu and the thunderbolt and flash technique. He is so proficient in these techniques that he can use them to create bypasses, even while asleep. His sword skills have enabled him to fend off hordes of spiders and defend three train carriages under relentless attack from Enmu. Zenitsu’s skills in the art of swordsmanship developed to the point where he was able to take on the higher-ranking demons of the Twelve Kizuki, and then fight a considerably weakened Muzan. This suggests that his swordsmanship skills most likely reached a level equivalent to that of the Hashira, the most powerful and highest-ranked swordsmen in the Demon Slayer Corps.

Sword mastery

  • Breath of Thunder (雷かみなりの呼こ吸きゅう Kaminari no kokyū): Zenitsu learned the Breath of Thunder breathing style from a cultivator and his master, Jigoro Kuwajima. Although he was unable to master all the forms of this sword style, he was nevertheless able to use the first of the six forms it contains, known as Thunderbolt and Flash. Despite this limitation, Zenitsu became incredibly adept at fighting and winning using only this first form. He has even created several variations and modifications of it, managing to successfully execute the technique even when unconscious.
  • Then Zenitsu even developed an entirely new form of Thunder Breath, a feat previously achieved only by the Hashira, in particular Giyu and Muichiro. This new form enabled him to turn the tables on his confrontation with Kaigaku, subduing and decapitating him instantly.
Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba
  • First form: Thunderclap and lightning (壱いちノ型かた 霹へき靂れき一いっ閃せん Ichi no kata: Hekireki Issen?) – The user draws his katana and rushes in at lightning speed to decapitate his opponent before he can even react, then sheathes it again. This technique is strongly reminiscent of Iaijutsu, and its movements are described as being similar to “lightning splitting the air”.
  • Sextuple (六ろく連れん Rokuren?) – An extension of the Thunderclap and Flash technique created by Zenitsu. The user executes Thunderclap and Flash six times in a row while slightly increasing the power and speed of his attacks.
  • Eight (八はち連れん Hachiren?) – An extension of the Thunderclap and Flash technique created by Zenitsu. The user executes Thunderclap and Flash eight times in a row while slightly increasing the power and speed of his attacks.
  • God Speed (神しん速そく Shinsoku?) – An extension of the Thunderclap and Flash technique created by Zenitsu. The user performs Thunderclap and Flash while dramatically increasing the speed of the technique. When this technique was first demonstrated, an unconscious Zenitsu remarked that he shouldn’t use it more than twice, otherwise his legs would be exhausted by muscle fatigue. However, during the fight against Muzan Kibutsuji, Zenitsu showed an improvement in his mastery of this technique, enabling him to use it more than twice while maintaining his power and speed.
  • Seventh form: Honoikazuchi no Kami (漆しちノ型かた 火ほの雷いかづちの神かみ Shichi no kata: Honoikazuchi no Kami?, literally “Seventh form: God of Flaming Thunder”) – A personal creation by Zenitsu Agatsuma. The user launches forward at dazzling speed and unleashes a single forward attack from a low stance, accompanied by a yellow Japanese dragon in the form of a lightning bolt.

Techniques exclusive to the game

  • First form: Thunderclap and Lightning, Prime (壱いちノ型かた 霹へき靂れき一いっ閃せん・極きわみ Ichi no kata: Hekireki Issen – Kiwami?) – A variation of Thunderclap and Lightning created by Zenitsu. The user executes Thunderclap and Flash with such force that it cracks and uproots the ground beneath his feet, then tears the ground apart as he attempts to stop his momentum. This move can also be executed in the air, allowing the user to be thrown diagonally towards the ground.
  • Air Spin (空くう転てん Kūten?) – The user gives a circular blow in the air to his opponent.
Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba

Equipment

Standard Nichirin katana: As a demon slayer, Zenitsu is equipped with a Nichirin katana of standard size and shape, adorned with lightning bolts along the blade. The hilt of his sword is circular with four slight indentations, the center silvered with small triangles and a golden border. His katana comes with a standard deep-black scabbard.

Fights

<Tsuzumi Mansion Arc:

  • Zenitsu Agatsuma vs Tongue Demon

Mount Natagumo Arch:

  • Zenitsu Agatsuma vs Spider Demon (son)

Mugen Train Arch:

  • Demon slayers vs Enmu

Entertainment District Arc:

  • Zenitsu Agatsuma and Inosuke Hashibira vs Daki

Infinity Castle Arc:

  • Zenitsu Agatsuma vs Kaigaku

Sunrise Countdown Arc:

  • Demon Slayers vs Muzan Kibutsuji : Part 2
  • Tanjiro Kamado vs Demon Slayers

Triviality

  • Zenitsu’s surname, “Agatsuma”, literally means “my wife”, while her first name, “Zen’itsu”, means “goodness”. Her first name is composed of the kanji meaning “good” and “special, unique”.
  • Here are Zenitsu’s rankings in popularity polls:
  • In the first popularity poll, Zenitsu ranked second with 4,299 votes.
  • In the second popularity poll, Zenitsu took first place with 17,451 votes.
  • Zenitsu also appeared in The Promised Neverland’s 2020 popularity poll, ranking 29th with 44 votes.
  • Thanks to his developed hearing, Zenitsu is very gifted at playing the shamisen and koto.
  • Zenitsu was also mispronounced by Inosuke. For example, he was called “Monitsu” (紋逸) and “Chuitsu” (チュウ逸) in Inosuke’s squirrel dream.
  • In a Weekly Shonen Jump 4-koma spoof, Zenitsu plays shamisen in the group “Chic-N-Scruffy Democracy”, with Tanjiro on vocals, Inosuke on taiko and Tengen on harmonica. Their first single is entitled “Melancholy of Explosive Sound Skin and Modern Sense of Smell” and is said to have caused dizziness and nausea in those who heard it. Zenitsu also wrote a song entitled “Past Life Sins” for the band under the name “zenithu☆A”.
  • Zenitsu is the only demon slayer outside the Hashira to have performed feats normally reserved for the Hashira, such as:
  • Creating a new original form in a breathing style with multiple users (accomplished by Giyu Tomioka).
  • Defeat a high-ranking demon alone (accomplished by Muichiro Tokito).
  • <Zenitsu has a dental bite problem.
  • The pattern on Zenitsu’s haori seems to be inspired by the Uroko, a traditional Japanese motif symbolizing scales. Samurai wore clothes with this pattern to protect themselves from danger.
  • After the events of the story, Zenitsu wrote a memoir entitled “The Legend of Zenitsu”.
  • Zenitsu is superstitious, as evidenced by his delight at seeing two tea stems in his cup in the extra chapters. In Japan, when drinking Japanese green tea, seeing the Chabashira or a tea stem floating vertically in your cup is considered a sign of good luck.
  • There are six shapes, but Zenitsu has only managed to learn the first one. Although it’s supposed to be the basis for the other forms, he perfected it to the point where he could fight several powerful demons. Eventually, he created a seventh form and defeated his former elder, who had become the sixth highest rank of the twelve Kizuki.
  • Zenitsu is a city boy and has already taken the train. That’s why going out and training with his master in the mountains was 10 times harder for him than for Tanjiro and Inosuke. He doesn’t really care about the inconveniences of the countryside either.
  • Thanks to his developed hearing, Zenitsu can hear the nasty remarks girls make about him behind his back. This has caused him such a fear of girls that he can no longer stand them. However, his naturally cheerful and persevering nature allows him to recover quickly from these experiences.
  • Although he fell in love with Nezuko at first sight, Zenitsu was skeptical about the way Tanjiro described her. He found it hard to believe that girls could be so one-sidedly nice. When he realized that Nezuko wasn’t a two-sided person and that she really was kind, he was so happy that he felt a kind of bliss and almost felt transported to paradise.
  • Zenitsu’s debt is estimated at around 600,000 yen in modern money.
  • This huge debt probably comes from his seven ex-girlfriends. Although they’re all beautiful, they treated him like a slave, cheated on him and stole his money. Zenitsu never had the chance to hold their hands.
  • Zenitsu likes sweet, expensive food, especially “high-quality eel” (commonly known as kabayaki), so if he hadn’t become a swordsman, he’d probably be coated.
  • At Kimetsu Academy, Zenitsu is a morality officer who has been assigned to the committee in spite of himself. He carries out uniform checks every day at the school gate while being terrified of delinquents. Despite his fears, Zenitsu takes his role as morality officer seriously and ensures that students respect the school’s dress code.

Quotes

  • (To himself) ” I hate myself more than anyone. I always think I need to pull myself together, but I end up cowering, running, whining. I want to change. I want to be a competent person.”
  • (To himself regarding Kyojuro Rengoku’s death) ” People don’t recover instantly. No matter how strong a person is, they can feel pain and sadness. But hiding from it doesn’t solve anything. You have to wake up your aching heart and get up again. I’m sure Rengoku was that kind of person.”
  • (To Daki) ” Before you die, I have a task for you. Apologize to the girl whose ear you almost ripped off. It may be your money that pays for their clothes, food and shelter, but these girls aren’t your toys. You won’t get away with it. “
  • (To Kaigaku) ” Grandpa wasn’t senile. If I’m scum, then you’re scum. I pity Grandpa for having such pathetic successors. I can only do the first form and you can do anything but that!”
  • (A Kaigaku) ” This is my form. I created it, so it’s all mine. With this technique… I wanted to fight you as equals! “
  • (To Tanjiro Kamado) “Tanjiro! Concentrate on staying alive! Can you hear me? Do not die! You can’t die! Nezuko will become human again! And you’re going to get her out of here! And return to the house where you grew up! Your family awaits your return!”
Zenitsu Agatsuma | Demon Slayer Kimetsu No Yaiba

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