Obanai Iguro

Obanai Iguro is a Demon Slayer and the Snake Pillar of the Demon Slayer Corps.

Appearance
Obanai is a young man of short stature and a pale complexion. He has straight-edged black hair of varying lengths, the longest reaching down to his shoulders and the shortest stopping at his cheekbones, which he wears down with two shorter strands hanging between his eyes. His eyes are almond-shaped and tilt upwards on the far sides, and are unusual due to Obanai possessing heterochromia—his right eye is yellow and his left eye is turquoise, however, his eyesight is worse in his right eye. Obanai's mouth is also unusual in that, when he was twelve, it was cut from its corners to his ears to make it appear more like that of a snake, leaving a large wound that he keeps hidden under the bandage he wears over his lower face.

He wears a navy blue version of the standard Demon Slayer uniform, along with a black and white pinstriped haori, the hem and cuffs of which are striped lengthways rather than vertically, which covers his hands. Obanai also sports bandages in place of the leg-wraps around his calves, as well as another set of bandages that cover his mouth, and blue-strapped zori on his feet. He is also always seen with his white snake, Kaburamaru, wrapped around his shoulders.

When he was a child, Obanai had waist-length hair that he wore tied down his back with a long white bandage and a regular-looking mouth. He wore a plain white kimono.

Personality
Obanai is a very harsh and strict individual who shows no concern for those who do not abide the Demon Slayer conduct. His expectations for his fellow Demon Slayers are nigh-unrealistic, berating Tengen Uzui for suffering heavy wounds against the "weakest" Upper Moon and telling him to "fight to the death" when Tengen insists on retiring. In reality, the Demon Slayer Corps had gone 113 years without killing an Upper Moon, and Shinobu Kocho later estimates that each Upper Moon is equal to three Pillars in strength.

Obanai's devotion to the future of the Demon Slayer Corps comes close to being at others' expense, such as when he tries to force Tengen to stay with the Demon Slayers even after losing an eye and arm, and when he ties up lower-ranked Demon Slayers and uses them as obstacles during Pillar Training for relatively petty reasons. He also sees the newer Demon Slayer recruits as weak and incapable of improvement, expressing surprise when Tengen informs him that Tanjiro Kamado survived the mission.

Despite his merciless personality, there are two people he cares deeply about: Kagaya Ubuyashiki and Mitsuri Kanroji. He has a crush on Mitsuri, which is implied by most of their companions save for Tanjiro and Mitsuri herself; even giving her her green socks she wears as a present. He threatens Tanjiro for growing too close to her (for his tastes) and he is the first person to meet up with her in the Dimensional Infinity Fortress.

Obanai is also noted to possess an immense sense of self-loathing due to the fact that he was born to a selfish and immoral clan who would mercilessly sacrifice to a Demon for their own monetary gain. Obanai considers himself and his family to be so tainted that, in order for him to ever be worthy of Mitsuri, he would first have to die and reincarnate into a whole new being life before confessing his feelings to her.

History
Obanai was born into a clan of thieves who lived off an excessive amount of riches that had been stolen from those who had been killed by the Demon that they worshipped. This Demon took the form of a woman with a snake-like lower body and face, and had a great taste for newborn babies, which is what the family sacrificed to her in exchange for their riches.

As the first boy born into the family for 370 years, Obanai lived out all of his days locked in a wooden cage being spoiled by his family, who insisted on bringing him so many plates of rich food that he became sick of it. The Snake Demon also took a liking to Obanai, since he was a rare male child with multicolored eyes, and would spend the nights slithering around his cage in the dark and staring at him, which frighted Obanai so much that he couldn't sleep.

When he turned twelve, Obanai was finally allowed to leave his cell. He was taken into a room that appeared to be an expensive shrine, and put face to face with the Snake Demon for the first time. The Demon remarked that Obanai was very small, and wondered to herself if she should wait to eat him until he was a little bigger. Deciding that she would, she organized his mouth to be cut wider, all the way to his ears, to match hers. The blood that he shed from this procedure was collected into a chalice that she then drank from.

Back in his cell with his wound now covered by a bandage, Obanai began only to think of escape and survival. He began to scratch away at the lattice of his cell with a stolen hairpin during the night, and by day he would be in a constant state of worry for fear that they could discover it. The only being he could trust was the snake that had strayed into his cage, Kaburamaru.

After a while of doing this, Obanai finally made his escape. As he ran, the Snake Demon began to pursue him, almost catching up to him and killing him before the Flame Pillar by chance came to his rescue. Because of Obanai's escape, the snake Demon had killed all fifty of his relatives and the only surviving member of his bloodline was his older cousin, who had also been saved by the Pillar. When they were reunited, however, Obanai's cousin rejected him, blaming him for their family's death.

Due to the effect his cousin's words had on him, Obanai joined the Demon Slayer Corps and decided to turn all his rage onto Demons, figuring that he'd feel like a better person if he risked his life for others.

Functional Recovery Training Arc
As the other Pillars discuss what to do with Nezuko Kamado, Obanai, lounging in a nearby tree, inquires how they would deal with Giyu Tomioka's breach of the Demon Slayer conduct. When Tanjiro insists Nezuko would never harm humans despite turning into a demon, the Snake Pillar tells him to not make such reckless remarks, as the girl would obviously protect her family, and as such he cannot trust anything the young Demon Slayer says. Soon afterwards, he notes with interest that even though Giyu had interjected to stop Tanjiro and Sanemi Shinazugawa's brief scuffle, the former had still managed to land a blow on the latter. Upon Kagaya's arrival, the Snake Pillar descended the tree and bowed in respect to his superior. He then reiterated his distrust for Tanjiro and Nezuko when his leader asked for all of them to accept the two, stating that they all hate Demons. He subsequently listened as Kagaya's attendant read Sakonji Urokodaki's letter concerning Tanjiro and Nezuko, and how Sakonji, Tanjiro, and Giyu would all slit their stomachs should Nezuko ever attack a human. When Kagaya revealed that Tanjiro had come into contact with Muzan Kibutsuji, a mess of questions and arguments broke out, but Obanai and the other Pillars are silenced by a simple gesture from their leader.

After Sanemi purposely injured himself to bait out Nezuko, Obanai reminded his fellow Pillar that he would have to get out of the sunlight in order for her to appear. He then swiftly pinned Tanjiro to the ground to prevent him from interfering, maintaining his hold despite Shinobu's protests.

Tanjiro continued to struggle heavily, but before Obanai could do anything further to him, Giyu grabbed his hand, allowing Tanjiro to escape from his grasp. Obanai angrily removed his hand from Giyu's grip, demanding to know what he is planning. The Snake Pillar was then chastised by Kagaya for his treatment of Tanjiro, causing him to reluctantly agree to refrain from such methods in the future.

Demon Train Arc
Obanai stands on a rooftop alone after learning of Kyojuro Rengoku's death, staring into the distance as he expresses his disbelief.

Entertainment District Arc
Obanai appears at the very end of the mission, after Daki and Gyutaro were already defeated. He partially congratulates his fellow Pillar for the victory against the Upper Moon, but greatly emphasizes the grievous injuries sustained against the "weakest" Upper Moon. He pressures the Pillar into remaining with the Demon Slayers, pointing to the vacancy left by Kyojuro's death and the increase in losses of lower-ranking Demon Slayers. Much to his surprise, Tengen maintains that the younger Demon Slayers—especially Tanjiro—were "definitely growing."

Pillar Training Arc
Obanai was present at the emergency Pillar meeting at the Ubuyashiki Estate. After Sanemi complains about not encountering any Upper Moons himself, Obanai comments that bumping into one is rare and then asks Mitsuri and Muichiro how they're doing. Amane Ubuyashiki arrives and apologizes for the absence of her husband. Obanai and the other Pillars bow to pay their respects. Amane informs the Pillars about the Demon Slayer Marks and asks Mitsuri and Muichiro to tell about how and what are the conditions to acquire one. Obanai is visibly suprised when Amane mentions that these marked Demon Slayers were close to defeating Muzan. When Mitsuri tries to explain how she got her mark, Obanai expresses embarrasment. After that Muichiro tells about his theory on the conditions to acquire a Demon Slayer Mark to Obanai and the others. When Giyu comments that he envies those simpletons who think gaining a mark is simple, Obanai glares at him, but says nothing. When the meeting ends, Giyu prepares to leave and tells the remaining Pillars to make future plans to acquire marks by themselves. Obanai angrily retorts that Giyu does not understand his position as the Water Pillar and asks if he plans to get a head start on them. Giyu simply states he is not like them. The other Pillars protest Giyu's decision as well, but before the situation escalates into fighting, Gyomei slams his hands together making Obanai and all of the others freeze in their tracks. Gyomei states he has a proposition.

This proposition turns out to be special training session called "Pillar Training". Obanai is put in charge of teaching proper sword techniques. When Tanjiro arrives to his training, Obanai states he has been waiting for him. Tanjiro tries to introduce himself, but Obanai tells him to shut up. He tells Tanjiro that he has heard about him from Mitsuri, but warns him that unlike her he is not a nice person. Obanai reveals that his training consists of swinging your sword while avoiding obstacles. He leads Tanjiro to a room where he has tied up all the students, making them into a sort of obstacle course. When Tanjiro questions Obanai about the students and what crimes have they committed to be tied up, he menacingly answers that they committed crimes of weaknesss, forgetting, taking their time and pissing him off. For the next four days Obanai trains Tanjiro to hit him while not hitting any of the tied up students. During the fourth day Tanjiro finally manages to slice off the haori Obanai was wearing, thus completing the training. Immediately afterwards, Obanai tells Tanjiro to "get the hell out of there" and to never talk to Mitsuri again.

Dimensional Infinity Fortress Arc
Obanai rushes to the Ubuyashiki estate after hearing the call that Muzan was there. However, Kagaya blows up the estate before he or the other Demon Slayers can arrive, killing himself, Amane Ubuyashiki, Nichika Ubuyashiki, and Hinaki Ubuyashiki while heavily wounding Muzan. Gyomei Himejima is the only Demon Slayer to know of this plan beforehand, as Kagaya knew the other Pillars would oppose his decision. After seeing Muzan, Obanai readies himself to unleash his first form on him, but Muzan transports him and the rest of the Pillars into his Dimensional Infinity Fortress. Obanai runs into Mitsuri and kills a group of Demons that she was fighting.

Later, he and Mitsuri encounter Nakime. Mitsuri jumps off a wall and lunges at the Demon, but Nakime uses her Blood Demon Art to erect a wall and send Mitsuri falling. Obanai jumps in and grabs her, getting her safely to another of the Fortress' pillars. As Nakime starts manipulating the Fortress in the hope of crushing the pair, Obanai is easily able to dodge. After Mitsuri tries to attack and was sent tumbling out of a window, Obanai tries to use his second form to decapitate the Demon. However, he too is sent out a window, expressing in a frustrated fashion how much of a pain Nakime's Blood Demon Art is to deal with, despite it not being very deadly.

After fighting Nakime for a while, Obanai and Mitsuri are informed of Muzan's revival and receive orders to group up with the other Pillars. After hearing how Muichiro and Genya sacrificed their own lives in order to defeat Upper Moon One, Obanai berates himself for not contributing as much to the battle as others have. He remarks how Nakime's Blood Demon Art makes it impossible for him to settle the fight. He thinks he must somehow find a way to get out of this situation.

With the help of Yushiro and his Blood Demon Art, Obanai and Mitsuri are able to get away from Nakime and they arrive to assist Giyu and Tanjiro who were fighting against Muzan. Obanai appears by Tanjiro's side, who was almost killed by Muzan, and tells him that he is a burden that needs to fallback. Tanjiro ignores Obanai's advice and instead says he is glad that Obanai is still alive. Obanai tells him to worry about himself first instead of others.

As Muzan grows furious over Nakime's failure, the battle between the Demon Slayers and Muzan resumes. Obanai uses his first form to attack Muzan, who blocks the attack. As the Dimensional Infinity Fortress starts to rapidly change due to Yushiro manipulating Nakime, the floor below the Demon Slayers and Muzan disappears. Obanai falls and lands on his feet on the platform below. Muzan continues his attacks which Obanai avoids. Obanai worryingly thinks that they need to get out of the Fortress before it crumbles, or they will all die. As Mitsuri is caught off guard by the platform rising, Muzan uses this chance to attack her, but Obanai jumps in to get her out of the way of Muzan's attack thus saving her life. The Fortress crumbles, but due to Yushiro, Obanai and the others are safely transported to the surface.

As the battle moves on to the surface, Obanai emerges from the wreckage of the Fortress. A crow informs the combatants that an hour and a half remain until morning. Muzan blasts the wreckage aside with his newly manifested Spine Whips and taunts the Pillars to try keep him there for that long. Muzan starts attacking once again. Obanai uses his third form and manages to get close to Muzan. He starts cutting of his head and remarks that even if Muzan does not die from getting his head cut off at least they could weaken him by slicing him to pieces. This does not prove to be the correct move as Obanai is shocked when his attack does nothing to Muzan. Obanai and the others realize Muzan is able instantly regenerate to the point that it is useless to try to weaken him using this tactic. As they figure out their mistake, they also realize they got too close to Muzan and are about to be killed by him. However, before that can happen Obanai and the others are shielded by lower ranking Demon Slayers who use their own bodies as shields. Obanai is grabbed by one whose entire lower half of body is sliced off. He is visibly shocked by this sacrifice but says nothing. Muzan reveals that just getting scratched by him once is a death sentence as he points to Tanjiro who is laying down on the ground lifeless.

Obanai and the two other Pillars continue their fight against Muzan. Obanai remarks on how he can't continuously breathe even with the three Pillars there due to Muzan's speed. As the battle rages on, Obanai is slashed once in the head and once in the shoulder by Muzan, but he continues to fight. Mitsuri, however, is immediately affected by Muzan's attack and falls over. Obanai yells her name, but she tells Obanai and Giyu to protect themselves instead. Before she is killed by Muzan, Gyomei appears and deflects the attack with his flail. At the same time Sanemi appears and uses the opportunity to slice Muzan in half and sets him on fire. The battle continues with Obanai and the four other Pillars joining forces.

As the battle continues and the Pillars keep getting pressed on, Obanai thinks about how he can't even shield Gyomei from attacks anymore and soon he will be unable to move himself. When Mitsuri is hit by another attack which forces her to the ground, Obanai is worried and hurries to her side. As Muzan prepares to slice both of them, the three other Pillars shield them while Obanai carries Mitsuri to safety. He entrusts her to a Kakushi and tells them to find Yushiro. Mitsuri tries to argue that she can still fight, but Obanai tells her she has done enough. He tells the Kakushi to take care of her and immediately rushes back towards the battle, ignoring Mitsuri's pleas. As he runs, he starts to ponder about how many people would still be alive if Demons didn't exist. He wonders how things would have been if he and Mitsuri had met under more peaceful circumstances. However, he dismisses this thought and considers it impossible. He thinks back on his childhood and how he wants to die defeating Muzan in order get rid of his family's impure blood. Obanai hopes that when he dies and if he and Mitsuri both reincarnate into a world without Demons, he can tell Mitsuri that he loves her.

After joining the battle once again, Obanai manages to cut off Muzan's arm by kicking and slashing the arm at the same time. Muzan notices that it is hindering his instant regeneration but remains unworried as it only buys them a miniscule amount of time. Obanai thinks to himself that Muzan's arms have mouths that have a dangerous inhalation ability. In order to avoid it he has to make huge movements that take up a lot of stamina. He proclaims to himself that they cannot afford to lose as he does not want all of the sacrifices thus far to be in vain. As the battle progresses Giyu loses his grip on his sword, but Obanai shields him from Muzan's attack and at the same time Sanemi tosses a new sword to Giyu. After 16 minutes of fighting since coming to the surface, Muzan is surprised by how long the Pillars have managed to last. As Muzan's poison is starting to affect the Pillars more and more, Obanai realizes that the poison is affecting him more than others due to his small body. In that moment, Chachamaru appears carrying antidotes to Muzan's poison. Obanai and the Pillars receive the antidotes, but Chachamaru is killed in the process. As Muzan grows furious, Obanai considers that he needs to find a more effective way to attack. He believes that he has contributed the least out of everyone. Thinking back on the report that Muichiro had turned his blade red during his final moments, he speculates that by gripping the sword as hard as you can, you can increse the temperature of the blade and thus turn it crimson red. In that moment his Demon Slayer Mark appears, and he grips his sword turning it crimson red.

After turning his blade red, Obanai's first thought was that he had made a mistake. He believes he was too eager to turn his blade red and used too much strength to do it which almost made him faint due to lack of oxygen. Sanemi yells Obanai's name as Muzan sends an attack towards Obanai. In that moment Obanai is unable to do anything, but to think of the fact that if even one of them falls they will no longer be able to break Muzan's attacks. In the last moment before the attack hits Obanai is thrown into the air by invisible Inosuke. Muzan realizes three new opponents have joined the fight, Inosuke, Zenitsu and Kanao, but they are using Yushiro's Blood Demon Art to render themselves invisible. As Muzan was figuring out what was happening, Obanai landed back on the ground. Using the trio's distraction to his advantage he slices Muzan's hand off with his red blade. The sliced body part regenerates much slower which inspires the combatants to continue fighting even harder. Obanai once again attacks and use his third form against Muzan. This allows the other Pillars to get a chance to turn their weapons red in their own respective ways. A crow informs that one hour and three minutes remain until dawn, meaning the battle has raged on between the Pillars and Muzan for 27 minutes since they came to the surface.

Obanai, the other Pillars and the trio continue pressing on Muzan scoring several hits. Gyomei accesses the See-Through World and finds out Muzan has multiple hearts and brains. Gyomei yells to Obanai to focus on Muzan's body and tell him if he can see through it. Obanai tries it and sees through it for an instant which confuses him. In that moment Muzan unleashes his Leg Whips, which catch Obanai and the others off guard. Obanai is hit and sent flying. He hits a wall and is rendered unconscious and bleeding.

Mitsuri Kanroji
Obanai is deeply in love with Mitsuri, but pride, nervousness and the fact that he feels he is not worthy of her due to his "filthy blood" keep him from being forthright. He gives her gifts, keeps correspondence through letters, and is protective of her, and, while she enjoys the attention he gives her, she seems oblivious to his feelings.

Giyu Tomioka
Obanai hates Giyu for unclear reasons, though Obanai's temper may be a large factor in it.

Tanjiro Kamado
Obanai also hates Tanjiro with a passion, even more than he hates Giyu. It started with Tanjiro's breach of Demon Slayer conduct and insubordination during the Pillars meeting, but intensified after Tanjiro interacted with Mitsuri during the Swordsmith Village attack and completed her Pillar Training with raving reviews. As the story goes on, Obanai shows something of warmth towards Tanjiro. An example is when Tanjiro gets slashed in the eye by Muzan, and Obanai jumps in to protect him.

Kyojuro Rengoku
Obanai seemed to deeply respect Kyojuro and held him in a high standard. He believed he was extremely powerful, expressing his disbelief when he died.

Tengen Uzui
Despite Tengen's victory against Upper Moon Six, Obanai downplays this significant achievement to instead emphasize the extent of his injuries. Tengen, for his part, brushes aside Obanai's concerns, insisting on retiring and disagreeing with the latter's sentiment that the Demon Slayers were going into decline.

Abilities and Powers
As a Pillar of the Demon Slayer Corps, Obanai is a very powerful swordsman.

Natural Abilities

 * Master Swordsman: As a Pillar of the Demon Slayer Corps, Obanai is one of the most powerful and skilled swordsmen in the entire organization. During the Pillar training, he taught sword skill revision training to the other Demon Slayers, further showcasing his skill with a sword.


 * Enhanced Strength: Obanai possesses great amount of physical strength, as shown when he pins Tanjiro to the ground with great force, with Tanjiro stating that he couldn't move or breathe. Despite this, however, he is considered to be the second-weakest member of the current Pillars in physical strength after Shinobu.


 * Enhanced Endurance: After being hit by Muzan's attack and being injected with his blood, he was able to keep on fighting alongside Giyu, unlike his other fellow Pillar, Mitsuri, who was greatly affected by the same attack.


 * Crimson Red Nichirin Blade: During the battle against Muzan, after manifesting a Demon Slayer Mark and remembering how Muichiro turned his blade red, Obanai puts all of his strength into gripping his blade, turning it to crimson red. Though by doing this, he put too much strength into his grip and almost fainted. Red Blades are extremely powerful, as they dampen a Demon's powers and regeneration.


 * Demon Slayer Mark: During the battle against Muzan, Obanai awakened his own mark. After awakening his mark, which presumably enhanced all of his abilities, he was able to land several blows on Muzan unscathed.


 * See-Through World (きる): During the battle against Muzan, after being instructed by Gyomei, Obanai managed to briefly access the See-Through World.

Swordsmanship

 * Unique Weapon: Like his fellow Pillars Mitsuri, Gyomei, Shinobu, and Tengen, Obanai wields a unique Nichirin Blade. His blade is similar in appearance to an Indonesian Kris Sword, with the sword's shape modeled into waves to complement Obanai's Breath of the Serpent techniques.

Breath of the Serpent (の): A breath style that focuses on twisting and bending the sword like how a serpent slithers. It bears resemblance to Mitsuri's Breath of Love Style, but his sword is much more like a typical sword with a blade that is shaped like how a snake slithers, while Mitsuri’s is long, soft, and more like a cutting whip.


 * First Form: Weaving Slash (ノ り) - Obanai rotates and releases a circular slash in front of him.


 * Second Form: Venom Fangs of the Narrow Head (ノ の): Obanai goes behind his opponent at blinding speed and lops off their head.


 * Third Form: Coil Choke (ノ め) Obanai curves his sword like a slithering snake and quickly decapitates his opponent.


 * Fourth Form:


 * Fifth Form: Slithering Serpent (ノ): Obanai using his bending sword, curves it right to left at incredible speeds. This technique is capable of decapitating multiple targets at once.

Trivia

 * The snake around Obanai's neck is named Kaburamaru.
 * Obanai considers Kaburamaru as more of a friend than a pet.
 * Obanai is not very strong in terms of physical strength as he is listed "a little weak" by Koyoharu Gotōge when asked about arm-wrestling strength between the Pillars.
 * His voice actor, Kenichi Suzumura, is married to Tamayo's voice actress, Maaya Sakamoto.

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