Kurogiri/Synopsis

History
After the death of Oboro Shirakumo, his body was recovered by All For One and taken to Doctor Kyudai Garaki, who combined various Quirk Factors to create the Nomu called Kurogiri. All For One utilized Kurogiri with aiding and overseeing his various projects, and eventually directly in the development of Tomura Shigaraki.

Underground Masquerade Arc
In order to get more Quirks, test several versions of Quirk-Boosting Drugs, and carry out other illicit businesses, All For One organizes the Underground Masquerade, a clandestine fighting tournament. Well safe in a secret place, All For One watches the fighting through the security cameras, accompanied by Kurogiri.

The tournament lasts several days, so that the rumors of drug's traffic and the disappearance of several underground fighters attract the attention of the hero O'Clock, who decides to participate under the persona of The Ripper in order to obtain evidence. Likewise, that same day, a young Rumi Usagiyama also infiltrates the event, challenging everyone present to fight her, and transforming the competition into a one-side battle. Because of the latter, All For One reconsiders his plan to abandon the arena, and decides to harvest more valuable Quirks.

Suddenly the alarm goes off, followed by a gas starting to pour into the arena. Those who breathe the gas receive a Quirk boost as they lose control and go wild. To prevent anyone from fleeing, All For One locks all the doors to the passages and emergency stairwell, and deploys his subordinates protected with gas masks to ensure that no one can flee. Then, with the help of Kurogiri and his Warp Gate, All For One puts his hand on several of those affected by the gas and steals their Quirk.

When All For One and Kurogiri go for Rumi's Quirk too, O'Clock uses his Quirk to snag her. Kurogiri tries to go after them with his mist, but O'Clock deduces that they are tracking them through the security cameras, and uses the crowd to avoid Kurogiri's dark fog, slinking away to a blindspot where The Rapper, an underground wrestler with whom he formed a temporary alliance, is waiting for him, The three put together a plan to escape, with Rumi and Rapper opening the way and with O'Clock destroying the security cameras so their pursuers can't track them.

In his secret base, All For One looks on surprised, thinking about how they may fail in their objective. With false concern, he asks Kurogiri what he should do, who replies that, in order to prevent any setback, he has already dispatched the Hooded Man to the scene.

O'Clock and his allies come face to face with the asset sent by All For One, leading to an intense fight. All For One is annoyed at being unable to see a clear view of the battle, due to most of the security cameras being destroyed, as well as the panicking spectators getting in the way. He contemplates clearing the arena himself, but Kurogiri disagrees as he believes any further escalation might summon All Might to the place, further irritating All For One. He decides to let the situation settle on its own.

While fighting, O'Clock realizes that the Hooded Man is a very dangerous enemy to deal with on their own, so he and Kendo distract him long enough for Rumi to escape and warn a police force allied with the pro hero outside. She calls for Detective Eizo Tanuma, giving him the message from O'Clock, to call All Might. Acceding to the Pro Hero's request, Eizo activates the Might Signal which sends an emergency dispatch request to the Might Tower. After receiving the request, All Might immediately blasts off to solve the threat.

Kurogiri informs All For One that since All Might is on his way, they should retreat so as not to lose their valuable test subjects, as well as O'Clock, but All For One, annoyed that he can't watch the fight between O'Clock and the Hooded Man, instead requests Kurogiri to assist him in buying some time.

After All For One explains to him the dichotomy between heroes and villains, and how the relationship between a person's will and their Quirk is what defines one and the other, Kurogiri uses his Warp Gate, allowing All For One to use his powers to boost the Quirks on several of the unconscious individuals, turning them into violent Instant Villains, who break out the parking structure, running and rampaging through the Osaka streets, causing all kind of mayhem.

All For One laughs to himself with how much trouble he's caused, and how it'll take even All Might a bit of time to resolve everything, though Kurogiri reminds him that this incident will almost surely provide a heavy clue he is responsible and that they've gone too far. All For One responds that the heroes are welcome to the clue and that it's a risk he's willing to take to allow him to watch O'Clock fight, and attempt to take his Overclock Quirk now.

All Might arrives and defeats all the people transformed by All For One in a flash. Kurogiri relents that All Might's actions barely bought them anytime, but All For One gleefully responds that it bought them "three seconds." In those few seconds, the Hooded Man is about to defeat O'Clock. That's the moment All For One was expecting, but his plans are frustrated when Rumi returns and knocks the Hooded Man to the ground with a swift kick, making those three seconds their diversion gave them got wasted, much to the villain's irritation.

Due to All Might approaching the place of the fight, Kurogiri uses his Quirk to quickly retrieve the Hooded Man, as he screams saying he can still fight. All Might arrives, confused, as Tiger Bunny informs him he got away.

Once in All For One's hideout, the Hooded Man rampages around, furious that his fight was interrupted, when he's stopped and restrained by All For One. Using his Quirks to shut the Hooded Man down, All For One tells Kurogiri to transport him over to the Doctor for further modifications. Despite the missed opportunity, All For One does not lose his cool, though comments to Kurogiri that getting his hands on Overclock would've furthered the cause. Kurogiri says that O'Clock is a Quirk-y and wondrous ability, and All For One assures him that it will be his eventually and he already knows how he'll put it to use.

Several years later, Kurogiri continued to assist All For One in various endeavors, including his work in developing the Nomu, before eventually being tasked to directly oversee Tomura.

U.S.J. Arc
With the Nomu and an army of disposable villains at their control, Tomura and Kurogiri break into the Unforeseen Simulation Joint, using Kurogiri's Quirk to warp himself and the villains to the area. He then appears before the escaping class of students, introducing themselves as the League of Villains and revealing that they were the ones who broke into U.A. High School the previous day.

He goes on to say that their mission is to kill All Might and wonders why he isn't here. Katsuki Bakugo and Eijiro Kirishima attack Kurogiri, but their attacks simply go through him. He then uses his Quirk to warp most of the students to various areas of the USJ.

After doing this, Kurogiri fights the Space Hero: Thirteen. Kurogiri uses his Quirk against Thirteen's Quirk by warping the hero's Black Hole against her. As Thirteen's Quirk starts turning her to dust, Kurogiri says that her battle experience is far lower than other heroes due to her only specializing in disaster relief. Having incapacitated Thirteen, Kurogiri tries to stop Tenya Ida from escaping, knowing that Tenya's escape would put the League of Villains in jeopardy, but is intercepted by Mezo Shoji.

As Tenya reaches the exit, Kurogiri tries to attack him again, but Ochaco Uraraka, seeing a physical part of him, is able to grab him and use her Zero Gravity to make him float into the air, stopping him with the help of Hanta Sero and Rikido Sato. After being flung into the air, Kurogiri decides to warn Tomura and warps himself away. He appears before Tomura Shigaraki, and informs him on the situation, telling him that he has incapacitated Thirteen but failed to stop one of the students from escaping, much to Tomura's frustration. Realizing that the escaped student will most likely go and find dozens of Pro Heroes whom they won't be able to defeat, Tomura decides to retreat, but not before killing the remaining students.

Tomura and the Nomu attack Izuku, Tsuyu, and Mineta, but before they have a chance to hurt them, All Might arrives at the scene. Tomura decides to continue his mission. All Might starts by striking Nomu, but the creature absorbs the impact. All Might figures that he can wear Nomu down, and uses a powerful reverse suplex to smash Nomu into the ground. However, Kurogiri intervenes, using his Quirk to save Nomu and allowing Nomu to turn the tables on All Might. All Might sends half of Nomu's body through a portal while he still remains in the suplex position. Nomu uses the opening to grab onto All Might's weak point, while Kurogiri slowly drags him into the warp gate, to carry out his duty to eviscerate All Might.

Alert to All Might's peril, Izuku rushes over to aid him. Kurogiri cuts Izuku off and prepares to warp him away, but Katsuki appears and strikes Kurogiri and pins him down, preventing him from using his Quirk. Kurogiri is then set free when Nomu attempts to attack Katsuki. Knowing that his powers are declining rapidly, All Might engages Nomu in a ferocious fistfight. All Might decides to surpass his 100% after seeing that his attacks are having minimal effect. All Might launches a devastating punch against Nomu, sending Nomu flying out of the U.S.J., defeating him.

After All Might defeats Nomu and Tomura starts to panic, Kurogiri calms him down by saying that Nomu did considerable damage to All Might and they should take the opportunity to finish the job. After Tomura regains his composure, he and Kurogiri attempt to attack All Might, but they are intercepted by Izuku Midoriya, which gives the heroes enough time to arrive at the USJ, in turn forcing Tomura and Kurogiri to stop their attack. They are then sucked into Thirteen's Black Hole and are seemingly turned into dust, but Kurogiri uses his Quirk at the last second to warp him and Tomura back to their hideout, thus saving themselves from being apprehended.

Once they arrive to their hideout, All For One asks them trought a monitor about the whereabouts of Nomu, Kurogiri regretfully reports that they do not know Nomu's coordinates due to him being thrown far away and were unable to pinpoint his location, thus being unable to retrieve him.

U.A. Sports Festival Arc
Kurogiri appears before the hero killer, Stain, who draws his katana and aims it at Kurogiri. Kurogiri tells Stain to withhold his blade as they have similar interests and that he has been wanting to meet someone of his notoriety. Kurogiri then asks Stain for a moment of his time, teleporting them both away.

Vs. Hero Killer Arc
Kurogiri brings Stain to the League of Villains hideout to meet with Tomura. However, the meeting between Stain and Tomura goes awry. Kurogiri asks the mysterious voice on the monitor if it is all right to keep the meeting going, but the voice orders Kurogiri to allow them to continue, saying that Tomura's meeting with Stain (an experienced infamous villain) will stimulate Tomura's growth.

The meeting between Tomura and Stain turns into a fight. Kurogiri tries to intervene, but Stain injures him and prevents him from moving. After Stain and Tomura declare their common interest in destroying the current society, Stain restores Kurogiri's mobility and demands to be returned to Hosu.

Kurogiri warps himself, Stain, and Tomura to Hosu. After Stain leaves to finish his business, Tomura complains about Stain's constant preaching, to which Kurogiri replies that he shouldn't mock Stain for his preaching and states that Stain's villainous methods have produced great results, which intrigues Tomura. Tomura orders Kurogiri to release the Nomu. Kurogiri warps three Nomus to their location, and Tomura orders the Nomu to attack Hosu.

Kurogiri asks Tomura if he will join the assault on Hosu. Tomura replies that he won't because of his shoulder injury.

Tomura, using binoculars, watches Stain kill the winged Nomu and becomes annoyed that nothing is going his way. After the other two Nomu are restrained and arrested, Tomura disintegrates his binoculars out of anger. Tomura decides to leave and return to the League of Villains hideout. Kurogiri asks Tomura if the results of the attack on Hosu are to his satisfaction, but Tomura replies that the results depend on tomorrow. Kurogiri teleports himself and Tomura back to the League of Villains hideout.

Final Exams Arc
When Giran brings in two candidates to join the League of Villains, Tomura becomes displeased with his visitors due to them seemingly being types he despises the most and orders Kurogiri to send them away. Kurogiri asks Tomura to be patient and listen to what the visitors have to say because they were scouted by the broker who produces quality results. The Broker tells Kurogiri that he wants his service charge one way or another; The Broker also agrees with Kurogiri about letting them introduce themselves.

After Himiko Toga and Dabi introduce themselves, Tomura becomes angry at them for talking about Chizome, and prepares to attack them. As the three clash, Kurogiri uses his Quirk to stop the fight. Telling Tomura that expansion is necessary in order to achieve his wishes, now that the spotlight is on them. He asks him to not reject help. Reminding Tomura if he doesn't make use of any of the offered help, everything left to them will disappear.

Understanding Kurogiri, Tomura storms out of the room. The Broker comments about Tomura being too young; Kurogiri asks the broker to wait a few days for their reply regarding Dabi and Himiko's registration; he comments that Tomura understands what needs to be done and he is sure he'll understandingly accept them.

Forest Training Camp Arc
After finding his own convictions to achieve his goals, Tomura decides to organize an operation to kidnap Katsuki Bakugo with the new recruits of the League of Villains, the Vanguard Action Squad. At the League of Villains' hideout, Kurogiri wonders if the Vanguard Action Squad will be able to handle the mission. Tomura assures Kurogiri that they will be fine; Tomura decides that it is not time for him to reappear and begins to comment on his gameplay. Tomura realizes that his gameplay was faulty when he first attempted to murder All Might and now has decided to let his pawns take down the ones up high before aiming for the final boss.

Tomura explains that he intends for the Vanguard Action Squad to make a crack in the superhuman society, noting that the Vanguard Action Squad's endeavors at Class 1-A and 1-B's training camp will be a blow for the Pro Heroes whether they succeed or not. Kurogiri questions if the Vanguard Action Squad means nothing to him, but Tomura rebuffs Kurogiri's claim, saying that he respects the Vanguard Action Squad's strength and personally hopes they succeed, Tomura continues to say that while they have their differences, they can rely on each other because both he and Kurogiri are not the only ones oppressed by society's rules.

Kurogiri arrives at the training camp in order to retrieve Spinner and Magne. After doing so, Kurogiri travels to the Vanguard Action Squad's rendezvous point and blocks Izuku, Mezo, and Shoto with his black mist. While blocking the young Heroes, Kurogiri warps Himiko, Twice, and the Noumu away from the training camp. After Mr. Compress deactivates his Quirk, which frees Fumikage and Katsuki, Kurogiri warps Mr. Compress, Dabi, and the captured Katsuki away from the training camp.

Hideout Raid Arc
After warping most of the Vanguard Action Squad back to the League of Villains' hideout, Kurogiri is present when Tomura talks to the restrained Katsuki.

Katsuki attacks Tomura and knocks off the hand on his face. Kurogiri attempts to rush to Tomura in order to calm him, but Tomura fiercely glares which stops Kurogiri. Tomura asks the Vanguard Action Squad and Kurogiri to let him handle Katsuki.

Tomura orders Kurogiri and Mr. Compress to knock out Katsuki. Suddenly, All Might breaks in with Kamui Wood swinging in and restrains Kurogiri along with the other League of Villains with his Lacquered Chain Prison. Tomura orders Kurogiri to warp all the Nomu to them. However, Kurogiri isn't able to warp the Nomu because they are no longer near the portals.

Refusing to let the pro heroes win, Tomura orders Kurogiri to create portals. However, Kurogiri is knocked unconscious by Edgeshot who used his Quirk to enter Kurogiri's body and knock him out from the inside.

Out of nowhere, Nomus appear from a mysterious back liquid that takes the pro heroes off guard. The unconscious Kurogiri along with the League of Villains and Katsuki Bakugo are teleported by the mysterious black liquid to the League of Villains' destroyed warehouse where All For One is. Before they can flee, All Might quickly arrives at the place and fights against All For One, while the rest tries to flee, capture Katsuki again and run away, but fail when Izuku, Eijiro, and Tenya manage to rescue Katsuki.

Understanding that they have lost, All For One uses his Forced Quirk Activation to activate Kurogiri's Warp Gate, thus creating a portal for the League of Villains to escape through. Before Tomura can attack Gran Torino, he along with the Vanguard Action Squad is magnetically pulled into Kurogiri's Warp Gate. The Vanguard Action Squad is forcefully sucked into Kurogiri's Warp Gate and is teleported away. As he is being sucked into the Warp Gate, Tomura calls out to his teacher concerned for his safety. Before Tomura teleports away, Sensei tells Tomura to continue the fight. Tomura and the unconscious Kurogiri are teleported away by the Warp Gate, causing the portal to disperse.

All For One is defeated and imprisoned, but thanks to his action, Tomura and his allies are safe.

Shie Hassaikai Arc
After an intense fight against All Might, All For One is defeated and imprisoned in Tartarus. His loss weakened the League of Villains considerably, and now, under Tomura's command, they try to reorganize and regain strength. Kurogiri remembers that All For One told him about a "power" he left behind that he could use to protect Tomura if he was caught or killed. Kurogiri explains it to Tomura and asks him for permission to retrieve that power for him. Tomura agrees.

During the battle between the Pro Heroes and the Shie Hassaikai, Gran Torino and Naomasa Tsukauchi have managed to track down and find Kurogiri with the help of eyewitness reports and have him subdued. Gran Torino tells Kurogiri that if they arrest him, the League of Villains will fall apart.

As Naomasa warns Gran Torino about Kurogiri's Quirk, Kurogiri asks Gran Torino if he knows of the rumors about a "wild man" appearing in the mountains where they are at. Kurogiri says he has business with the "wild man". Gran Torino would prefer Kurogiri to tell him all about it behind bars.

Suddenly, a huge noise reverberates in the area which catches Gran Torino's attention. An enormous beastly man that towers over trees appears with a radio around his neck, which surprises Gran Torino. Kurogiri states that the wild man is one of All For One's faithful servants: Gigantomachia.

Gran Torino took Kurogiri into police custody at the cost of allowing Gigantomachia to escape.

Paranormal Liberation War Arc
After being captured by Gran Torino and Detective Naomasa, Kurogiri was sent to Tartarus. Once there he shows no sign of confessing or disclosing anything about the League of Villains, but they uncover that the base of his Quirk resembles that of Oboro Shirakumo's Quirk Cloud.

Shota Aizawa and Hizashi Yamada are called to Tartarus and informed of what has been found about Kurogiri. They explain that he is unconscious because otherwise, he would activate his Quirk. Shota uses his Quirk as Kurogiri comes too. Hizashi notes that the mist still won't dissipate from Kurogiri's face. Kurogiri notes that it had been a while since he has visitors and recognizes Shota from the U.S.J. Incident. He then asks about Tomura and wonders where he is and if he has been captured. Shota observes that Kurogiri really cares about Tomura, and Kurogiri says it is his duty to care for him.

Shota remembers how Oboro would also take care of others and Kurogiri wonders what he is talking about as Shota takes off his goggles and cries out to Oboro, with tears in his eyes, saying if he is still in there somewhere, then the three of them will become heroes together. Shota continued to speak to Oboro inside of Kurogiri. Kurogiri denied knowing what he was talking about and said he was Kurogiri, but suddenly Oboro was able to break through Kurogiri's mist and provide a hint about a hospital, before Kurogiri falls unconscious.

Tartarus Escapees Arc
Some time after Shota and Hizashi's breakthrough, it was decided that Kurogiri, as well as the other captured Nomu, were to be secretly transported from Tartarus to Central Hospital for restorative research. Weeks after the Paranormal Liberation War, a hospitalized Shota visits Kurogiri and speaks to him every day. So far he hasn't made much progress with him, with him still remaining unconscious, but he's not losing hope.

Final War Arc
By the time of the "Second War", Shota has been unable to make any progress regarding Kurogiri, with him still unconscious this entire time, unsure of whether Oboro is able to retake control again or not. With his plan to defeat the Villains requiring the use of his Warp Gate Quirk, Shota instead enlists Neito Monoma to use his Copy Quirk on Kurogiri to copy Warp Gate, allowing them to use it to catch the villains off guard and split them up all over Japan. Believing the Villains will attempt to reclaim Kurogiri, they keep him locked away in the Hospital's research wing, and attempt to spread rumors of his location. However this fails, as they learn Spinner and his heteromorph army, consisting of the Paranormal Liberation Front and civilians, plan to storm the Hospital and free Kurogiri, who is considered to be the "High-End Nomu" closest to a masterpiece. Present Mic takes charge in the team assigned to defend the Hospital against the massive army.

Ultimately thanks to his new Quirks, the rampaging Spinner was able to breach into the hospital with his army following closely behind, however, they become hesitant to engage violence against the hospital faculty, leaving only Present Mic to pursue the villain. Heading deeper into the facility, Spinner and Present Mic emerge into the room holding the unresponsive Kurogiri. Approaching the tied up villain, Spinner and Mic each call out to Kurogiri and Oboro respectively. When Kurogiri doesn't respond to either of them, Spinner attempted to use a recording device with All For One and Tomura's voice inside to awaken him, but Present Mic attacks him with his Voice, destroying the recording device. Present Mic prepares to reluctantly kill Kurogiri to prevent him from escaping, however Spinner uses his last remaining strength to give him Tomura's remaining hand, telling Kurogiri to save him. As a result, "Kurogiri" breaks free from his restraints, and with the face of Oboro partially appearing on half of it, declares he is "the protector of Tomura Shigaraki".