Sukuna/Synopsis

History
Over a thousand years ago, Sukuna was a human sorcerer that had killed many of the sorcerers from the golden age of jujutsu. After Sukuna had died, his fingers became cursed objects.

Fearsome Womb Arc
One of Sukuna's fingers was kept in an outdoor thermometer box at Sugisawa High School. The school's occult club had taken the finger from the thermometer box and had tried to remove the seal placed on it. Once they had taken the seal of the finger off, other cursed spirits that the finger had drawn in attack the club members. As Yuji Itadori and Megumi Fushiguro came in to save the club members, Yuji eats the finger in order to fight off the cursed spirits.

This causes Sukuna to be incarnated into Yuji, which he is excited about. As Sukuna plans to start a massacre, he is stopped by Yuji who reclaims his body, which surprises the cursed spirit that he is able to resist his control so easily. When Megumi plans to kill Yuji to exorcise Sukuna, Satoru Gojo shows up and decides to test out Yuji's will. Sukuna is then given control of Yuji's body and starts to attack Gojo, but Yuji manages to take back control after ten seconds.

The next day, another one of Sukuna's finger is shown to Yuji, with Gojo explaining how there are twenty of them and that they cannot be destroyed. Yuji then eats another of Sukuna's fingers and is able to still keep Sukuna under control. Days later when Yuji is brought to the Tokyo College, Sukuna finds out that Gojo is not the leader of the sorcerers and says how he is disappointed. Sukuna also tells Gojo that he will kill Gojo first when he takes over Yuji's body, for not killing Yuji right away. As Gojo says that it's an honor to be targeted by Sukuna, Gojo then explains who Sukuna is to a curious Yuji.

During an investigation at a detention center, Sukuna is forcefully given control of Yuji's body to combat a special grade cursed spirit before it kills them. Instead of taking on the spirit, Sukuna decides to fight with the spirit in order to take out Megumi. When the spirit starts to attack Sukuna, Sukuna easily blocks the attacks and easily overwhelms the spirit. Sukuna then decides to teach the spirit a lesson and uses his domain expansion to easily cut the spirit into pieces. Sukuna then takes back his finger, which causes the spirit to die. Sukuna is prepared for Yuji to take back control, telling him to switch already, but when nothing happens, he eerily smiles realizing he can't.

Sukuna meets up with Megumi outside of the detention center, and removes Yuji's heart so that Yuji won't be able to switch with him. Sukuna then eats the finger that he had just got from the special grade cursed spirit and plans on killing Megumi. Sukuna and Megumi start to fight, where Sukuna easily defeats some of Megumi's shikigami, though he is impressed by the skill in which he utilizes them. Sukuna manages to push Megumi into a corner, questioning him on why he focused on fleeing, which confuses Megumi. Nonetheless, Megumi decides to fight seriously, which greatly enthuses Sukuna, but before the fight can continue, Yuji regains control from Sukuna, which results in Yuji's death.

After Yuji has died, Sukuna and Yuji start to fight one another within Sukuna's territory. Sukuna easily overpowers Yuji and after restraining Yuji, he tells him that they are not dead yet.

Sukuna proposes to bring Yuji back to life, with the condition that he will be able to take complete control of his body for a minute, but also swearing he won't harm any of his friends when he does. Yuji rejects and tells him just to revive him, so Sukuna proposes that they fight and the winner get their deal. Yuji accepts, but Sukuna immediately defeats him. Yuji is subsequently revived, aware that Sukuna is responsible, though with no memory of the deal he made with him.

Vs. Mahito Arc
One of Sukuna's fingers was placed in Junpei Yoshino's home, which resulted in Junpei's mother, Nagi Yoshino's death. Mahito then shows Junpei the finger and explains how it draws in cursed spirits. Mahito also manages to convince Junpei that it was one of his classmates who was responsible, even through it was in fact Mahito and Geto.

When Junpei slowly dies from Mahito using his Idle Transfiguration on him, Yuji desperately asks Sukuna for help in saving Junpei, but Sukuna sadistically refuses and mocks Yuji for relying on him when things get tough. Sukuna and Mahito then laugh at Yuji for being unable to save Junpei from his cruel fate. This would result in an enraged Yuji trying to finish off Mahito to avenge Junpei's death.

During the fight, Mahito tries to attack Yuji with his Idle Transfiguration, but Sukuna appears, warning Mahito not to touch his soul again and forces the curse out of his territory. However, Mahito taps into Sukuna's again upon witnessing Yuji breaking into his domain to help Kento Nanami. Sukuna senses that Mahito has touched his soul again and brutally wounds him for attempting to mess with him. Sukuna's finger is then collected and brought back to the college.

Kyoto Goodwill Event Arc
The fingers that are at the Tokyo college are collected, along with the Death Painting Wombs 1-3, by Mahito.

Death Painting Arc
After Sukuna was incarnated, the finger at Yasohachi Bridge awakens and starts to kill people. Megumi manages to defeat the spirit that has Sukuna's finger and retrieve it, which Sukuna is glad that Megumi was able to get stronger. After Yuji and Nobara Kugisaki reunite with Megumi, Sukuna creates a mouth on Yuji's palm and eats the finger when Megumi gives it to Yuji.

Days later, Sukuna taunts Yuji about how his awakening is killing people because he had eaten one of his fingers, which Yuji simply tells Sukuna to not to tell Megumi.

Shibuya Incident Arc
As the Shibuya Incident occurs, Gojo is sealed in Prison Realm by Pseudo-Geto, and the next step for the cursed spirits is to deal with Yuji and Sukuna. Mahito and Choso want to kill Yuji for their own reasons, but Jogo wants to release Sukuna. They decide to make it a game to see who succeeds in their goal.

After Yuji's fight against Choso, Sukuna comments on how pathetic it was that Yuji could have lost to an inferior opponent, but is surprised when he suddenly stumbles away, sparing his life and leaving him unconscious.

Right after this, Suguru Geto's subordinates, Nanako Hasaba and Mimiko Hasaba, approach Yuji and force feed him one of Sukuna's fingers they had collected. Jogo then appears behind them, scaring them away, and proceeding to force feed him the ten fingers they had collected, bringing the total Yuji has ingested to fifteen.

While Jogo still has his fingers around Yuji's neck, Sukuna takes control, demanding the cursed spirit to take them off. He commands the three to kneel before him, and cuts off the top of Jogo's head when he only takes a knee. Sukuna asks Nanako and Mimiko what they want with him, giving them one finger's worth of time. They ask him to kill the imposter possessing Geto, but he simply kills the both of them, as he doesn't like them ordering him around.

Sukuna then asks Jogo, but Jogo says that he wants nothing and explains how he just wants Sukuna to be fully revived. Jogo explains how Yuji can't take control right now and advises that Sukuna make a binding vow to permanently take control, but Sukuna rejects it since he has other plans. Sukuna then makes a deal with Jogo: if he can land a hit on him then he will kill everyone in Shibuya (minus one), which Jogo agrees to.

Sukuna then fights Jogo and completely overwhelms him. Sukuna taunts Jogo, while easily dodging all of his attacks. As Jogo uses his Maximum: Meteor attack, Sukuna notices several sorcerers and curse users on the ground preparing to flee. He suddenly appears before them and forces them all to stay put until he gives the signal. They all stand around fearing for their lives as the attack gets closer, before Sukuna eventually allows them to move right as the attack lands.

Jogo thinks he's succeeded, but Sukuna easily comes out of it unscathed. Sukuna wonders why Jogo is not using his domain, which Jogo says that his domain would lose. As things get interesting, Sukuna starts to use fire based attacks much to Jogo's confusion. Sukuna prepares to continue his fight with Jogo and subsequently defeats him.

As Jogo is dying, Sukuna meets with him and explains how Jogo is weak for trying to be like the humans. As Jogo agrees with him, Sukuna also explains how he had fun fighting Jogo and that he should be proud. Jogo starts to cry and wonders what it is, which Sukuna says that he doesn't know. Suddenly someone shows up to escort Sukuna, which he wonders who they are, only to recognize the person as Uraume. Suddenly, Sukuna senses that Megumi has summoned a powerful shikigami, and tells Uraume that he has something to do. Sukuna tells Uraume that it won't be long until he is completely free, and that Uraume shouldn't neglect their preparations; he bids them farewell and leaves.

Sukuna quickly arrives at the shikigami's location and saves the sorcerer that was facing off against Megumi. Sukuna notices the situation and thinks about how it was a good idea to save them since his death would result in Megumi's death as well. Sukuna heals Megumi and tells him to not die yet since there is something that he needs Megumi to do still. Sukuna thinks about how he'll defeat the shikigami, then that would void the ritual since he is an outsider. Sukuna then prepares to face the shikigami.

Mahoraga attacks with its sword, which Sukuna manages to block. Sukuna then wounds Mahoraga with his technique and figures that Mahoraga's sword is capable of exorcising any spirit since it uses positive energy. Mahoraga heals itself, which Sukuna attacks again but Mahoraga manages to counter it. Sukuna figures that Mahoraga is capable of seeing his technique. Mahoraga attacks which Sukuna tries to block but is sent flying. Mahoraga attacks again but Sukuna dodges and wounds Mahoraga.

Mahoraga heals itself again, which Sukuna figures that Mahoraga's ability is to adapt to any and all phenomena. Sukuna thinks about how this is what Megumi was trying to summon in their last fight, and that Mahoraga would have killed him. Sukuna then activates his domain: Malevolent Shrine, and uses its effect to cut up everything within a certain distance. While this is happening, Sukuna thinks about how to use his ability to defeat Mahoraga. When Mahoraga starts to heal, Sukuna uses a different ability to defeat Mahoraga.

Sukuna starts to leave, and tells Megumi's attacker to leave, in which the attacker runs into Sukuna's domain and dies. Realizing he's about to lose control of the body to Yuji, Sukuna quickly takes Megumi to get medical treatment and leaves. Returning back at the location where he had fought Mahoraga, Sukuna tells Yuji to take a look at all the destruction he caused, as Yuji takes back control, horrified by it all.

Itadori's Extermination Arc
In the aftermath of the Shibuya Incident, following Gojo's concealment and Pseudo-Geto's escape, Yuji's execution by the jujutsu higher-ups is reinstated, with his executioner chosen to be Yuta Okkotsu. He confronts Yuji on the streets, who has been trying to clean up curses with Choso, and proceeds to fight him. Using Rika, Yuta is successfully able to gain the upper hand and stabs Yuji in the chest. Sukuna is initially taken back, annoyed that he has been killed, only to sense something else going on, and eerily smiles.

As it turns out, Yuta had been asked by Gojo to help Yuji, and temporarily killed him to get out of his Binding Vow with the higher-ups, using his Reverse Cursed Technique to promptly heal him.

Culling Game Arc
As everyone is in the midst of dealing with the Culling Game, Yuji and Megumi seek out Hana Kurusu, in hopes of using her Cursed Technique to free Gojo from the Prison Realm. They succeed in finding her, but her symbiotic partner, Angel, tells them that first they have to track down and eliminate "the Disgraced One". In private, Sukuna reveals to Yuji that he is the Disgraced One they are referring to, causing a problem for him and Megumi.

After Master Tengen becomes compromised by Kenjaku, Yuji and Megumi begin their attempted counter-plan, starting with rescuing the latter's sister, Tsumiki, from having to participate in the game by giving her points. However, right after doing so, she uses her points to allow people to freely travel through colonies, revealing herself to actually be a reincarnated sorcerer known as Yorozu, leaving Megumi completely speechless.

She flies away, intending to fight Sukuna, but before everyone can react, Sukuna activates his "Enchain" Binding Vow with Yuji, granting him complete control of the body without being able to harm anyone for a full minute. He quickly knocks Hana unconscious, and taking a gamble, rips off one of Yuji's fingers. Sukuna laughs manically realizing that Yuji didn't take himself into account on who he couldn't harm, and before Megumi can do anything, he chokes him out, force-feeding him the finger, and transferring his consciousness into Megumi.

Yuji wakes up in a chokehold shocked to see Sukuna now in complete control of Megumi. Sukuna punches Yuji, causing him to spit blood and fly through several buildings. He spots Maki and Takaba noticing what just happened, and comments that no matter what era he is in, insects always appear out of nowhere. He uses Megumi's Ten Shadows Technique to summon a huge and demonic version of Nue, which drops massive lightning bolts on Maki and Takaba. While Sukuna is not paying attention, Hana sneaks up behind him and attacks him with her Cursed Technique, which burns Sukuna and causes his skin to tear, while she activates Jacob's Ladder, leading him to be hit by a massive beam of light.

As he screams in pain, Hana shouts to Sukuna to bring Megumi back because he belongs to her. Suddenly, Sukuna's tattoo on Megumi starts to fade and he speaks to Hana in a charming voice saying that everything is fine and he invites her for a hug. Hana listens and lets down her guard, accepting "Megumi's" request despite Angel's warnings. Sure enough, Sukuna was merely pretending to be Megumi and uses the opportunity to bite down hard, calling her a stupid person, and dropping her towards the ground.

Just then, Yuji re-appears jumping off the ground and landing on a building next to Sukuna, causing him to mockingly comment that Yuji is still alive. Yuji jumps off the building with so much force that the roof of the building is destroyed. Sukuna is shocked by Yuji's sudden increase in strength and they both grab each other by the neck and fall off the building. They both land on the ground unharmed, as Yuji kicks a huge rock towards Sukuna, which he trees to stop only for Yuji to grab another and smash it on Sukuna's back.

However, the attack had no effect on Sukuna, who kicks Yuji in the face, trying to understand how Yuji has been able to take so much punishment, commenting on how "twisted" Kenjaku is, having deduced something in regards to the two's familiar relationship. Yuji yells at Sukuna, asking him why he and his allies can't just live a normal life without causing harm to others, but Sukuna cuts Yuji's shoulder with "Dismantle", asking Yuji why such weak creatures cling to life so fiercely, comparing humans to insects and saying that creatures that fall apart at a touch can never be happy and that they should just swallow the suffering that life causes them.

Yuji realizes from Sukuna's words that Sukuna and his allies are curses and always will be, so stands up and asks Sukuna if he can swallow his suffering. Sukuna tells Yuji to try, and he begins to beat Yuji relentlessly with "Cleave", but to his shock, Yuji keeps moving despite Sukuna's attacks. Sukuna at first wonders how Yuji is so sturdy, but then realizes his cursed energy output is dropping because of Megumi, cursing him as Yuji is able to land a punch directly on Sukuna.

Sukuna realizes that due to Megumi's influence on his cursed energy dropping, he won't have access to 10% of his maximum power, but since Megumi is unable to affect the control over the body, Sukuna is confident the power he currently has will be more than enough to comfortably kill Yuji. As he gets ready to fight again, he suddenly notices Maki's presence and realizes that Nue's haphazard attack didn't do any damage to her, and that she is not a small fry like he assumed. Yuji and Maki proceed to attack Sukuna at the same time, but Sukuna is handle both of them very efficiently, keeping the fight at a stalemate. Eventually, Uraume interrupts the battle and uses Frost Calm on Yuji and Maki to freeze them completely. Sukuna praises Uraume on their achievement, summoning New to fly with them over towards "the bath". Yuji manages to break free from the ice and calls out to Sukuna, but he and Uraume just look down at him, making fun of his face as they laugh and fly away.

Sukuna proceeds to take a bath set up for him by Uraume and Kenjaku, submerging himself in curses and other "evils" in order to completely submerge Megumi's soul, granting him full control of his body and curse energy. Realizing he is not fully submerged, Sukuna decides to go and kill Yorozu, because if he can kill Megumi's sister, he knows that will completely drive Megumi into despair. He arrives in Sendai where he swiftly kills Ryu Ishigori who had attempted to confront him, complementing his toughness. He then confronts Yorozu, who had been waiting for him, all for her desire to get him to accept her love.

After a mostly one sided battle Sukuna kills Yorozu using the Ten shadows technique and also killing Tsumiki Fushiguro and in a way making it seems like Megumi killed his sister because he used his cursed technique making Megumi's soul sink deeper into the abyss and making his control over his body stronger. After his fight with Yorozu, Sukuna blocks an attack from Gojo Satoru that was meant to kill Kenjaku and the two agree to a duel on December 24th. After this exchange Sukuna eats the rest of his fingers that was given to him by Uraume and he replaces the final finger with his mummified real body from the heian era while commenting on how ironic it is to Tengen.

Shinjuku Showdown Arc
On December 24th he engaged in battle with Satoru Gojo. The battle starts with Satoru hitting Sukuna with a 200% Powered Hollow Purple, burning off his arm. Trading insults on the challenger of the fight, Sukuna and Gojo begin the fight by warming up, Gojo throwing Sukuna around with Blue and Sukuna responding by cutting a building nearby Gojo before they cause lot of collateral damage upon clashing attacks to which he comes out of unscathed.

Eventually both Gojo and Sukuna open their domain expansions, Unlimited Void clashing with Malevolent Shrine. While the two domains prove equally strong and refined, Malevolent Shrine's range of attack reaches even beyond Gojo's barrier and is able to eventually destroy Gojo's barrier, immediately causing the Malevolent Shrine's sure hit effect to slash Gojo's neck. Gojo survives by healing himself using reverse cursed technique, but as Malevolent Shrine keeps attacking Gojo, he is forced to focus his full output on reverse cursed technique as he is slashed all over his body. Gojo tries to run away from Malevolent Shrine's range, but Sukuna quickly starts engaging him again, with Gojo just managing to fend off the King of Curses as he notices that the center of Malevolent Shrine is Sukuna himself and not the Shrine. Gojo uses New Shadow Style: Simple Domain to counter Malevolent Shrine's effects, buying him the time to properly heal the cuts he received, but as the Simple Domain is quickly torn apart, Gojo stops healing himself and uses Simple Domain to fight off Sukuna long enough to use reverse cursed technique to replenish his burned out cursed technique. He quickly latches himself into Sukuna and uses Red on Sukuna, sending him flying into the shrine, as he fully heals himself.

Sukuna then gets taunted by Gojo to use his maximum range as he stands a few meters outside of the range of Malevolent Shrine, as Sukuna immediately grants Gojo his wish, Gojo opened his domain once again, this time reversing the outer and inner conditions of his domain barrier to make Unlimited Void's outer shell strong against attacks from the outside. They engage in hand-to-hand combat with Sukuna using Domain Amplification at higher output than before, but Gojo quickly notices that the effect of Malevolent Shrine was turned off within his barrier, along with realizing that Sukuna had focused the full strength of his sure-hit effect on the outside while he engaged Gojo in close-range to avoid the sure hit of Gojo's domain, countering the now stronger barrier allowing him to once more shatter Gojo's domain. However, now prepared for such a scenario, Gojo immediately activates Falling Blossom Emotion to defend himself and is able to weaken the slashes of Malevolent Shrine, as he muses on how he learned it as a child and while he didn't need to use it after mastering his domain, before he then expands his Domain once more, at first enlarging the barrier to encompass all of Sukuna's range before he then shrinks the barrier to a size smaller than a basketball using his experience in the Prison Realm.

Although Sukuna responded by reducing Malevolent Shrine's range to increase his cursed technique's output, this time Gojo's reinforced outer shell proved able to withstand Malevolent Shrine long enough to injure Sukuna to the point he wasn't able to maintain his domain, collapsing Malevolent Shrine as well. However, despite finally getting back at the King of Curses, Gojo starts to consider Sukuna's lack of usage of the Ten Shadows inside Unlimited Void, specifically Mahoraga, although he soon gets nose bleed and starts to feel dizzy. Still, both of them activate their domain and yet again, Gojo proves to be stronger in fighting inside a domain as he injures Sukuna's face and both Sukuna's and Gojo's domain breaks at the same time. On the next time they open their Domain, Gojo was able to cast his slightly faster than Sukuna to hit Sukuna with Unlimited Void for just 0,01 seconds, which weakened Sukuna and Malevolent Shrine, allowing Gojo to finally overpower Sukuna's domain decisively and shatter it, fully exposing Sukuna to Unlimited Void. To capture Sukuna, Gojo aims to destroy not only Sukuna's heart, but also his lungs and liver, in order to effectively incapacitate him by bringing him closer to death than Yuji was at the juvenile detention center.

However, Sukuna manages to summon Mahoraga and Mahoraga reveals it's adapted to his Domain as Gojo fails to destroy it in one shot using Red. Stunned, Gojo analyzes the situation and realizes Sukuna had used Megumi's soul to bear the burden of adaptation for Mahoraga. The strain of healing his burned out cursed technique catches up to Gojo as he nose bleeds and collapses due to essentially having burned the right prefrontal cortex and then healing it, leaving him unable to open his Domain to one-shot Mahoraga, but Sukuna too has sustained a similar degree of damage to his brain due to taking Unlimited Void just briefly, leaving them both at the situation where they cannot use their domain expansion. Gojo taunts Sukuna before he and Sukuna engage in the second round of their fighting, Gojo opening the next round by striking Sukuna using Blue.

As the fight continues, Gojo uses Blue to manipulate the environment against Sukuna as he tries to land decisive blows using hand-to-hand combat, but Sukuna is able to keep up with him and use Domain Amplification to force him back. Unfazed, Gojo deduces Domain Amplification blocks out Mahoraga's adaptation and after a brief exchange, he deduces Mahoraga needs three more spins to adapt. Confidently declaring he will kill Sukuna before that happens, Gojo starts to intensify the rythm as he begins to take a visible advantage, using Blue in various ways and managing to land some effective shots in hand-to-hand combat before using Red. Even though Sukuna uses Domain Amplification to neutralize the output, Gojo, already anticipating it, has Red circle around the building's layout to catch Sukuna off-guard and have it explode on his back. This allows Gojo to land a Black Flash that actually knocks Sukuna out, causing Mahoraga's wheel to fall, only for Mahoraga's wheel to still spin and the Shikigami is summoned to slash at Gojo's chest.

Despite the presence of Mahoraga and his dwindling cursed energy output, however, realizing that he wasn't actually guaranteed to win this fight only made Gojo more determined as he recalls Toji. He manages to stun Mahoraga, but before he could launch a full-charged Red, Sukuna regains consciousness and uses Rabbit Escape to make him miss his aim. As he engages Mahoraga, he withstands Sukuna's Max Elephant mimicking Piercing Blood, realizing that Sukuna is now freely using the 10 Shadows as Mahoraga can now pierce through his Infinity. Sukuna summons Fusion Beast Agito to make the fight 3-on-1. Although outnumbered, Gojo manages to avoid Mahoraga and Agito's attacks while also reacting to Sukuna's attempt to surprise him before launching Red, but it proves inefficient with Gojo's output weakened and Mahoraga having began to adapt to it. Gojo realizes he has to take out Mahoraga in one shot, even though he will require some time to charge up his Unlimited Hollow technique and his opponents are trying to disrupt the process. He manages to deliver attacks on Agito, even ripping off it's tail with a Black Flash, but it quickly regenerates as Gojo realizes Agito combines the power of Round Deer, Mourning Tiger, Great Serpent and Nue, which means he has to destroy it one shot due to it's reverse cursed technique meaning it can not only heal himself, but also Sukuna.

However, as Gojo focused on Agito, Mahoraga channels Sukuna's cursed technique to cut off his right arm, and Sukuna alongside Mahoraga briefly pummels Gojo but Gojo, having had enough of Agito, unleashes Blue at maximum output to crush Agito completely. Performing two Black Flashes allows Gojo to sharpen his output back and regain his arm, and after landing two more Black Flashes on Mahoraga, he proceeds to chant incantations to power up Red further, but rather than aiming it at Sukuna, Gojo aims the cursed technique reversal above to fuse it with the previous Maximum Output Blue that crushed Agito. He manages to intercept Mahoraga's attempts to cancel out Blue through Blue's high-speed movement, and though Sukuna attempts to launch Piercing Blood, Satoru simply chants a few more incantations that greatly amplifies Blue's power, allowing it to absorb Piercing Water as it fuses with Red. The strengthened Purple destroys Mahoraga and a major part of Shinjuku in a massive explosion of cursed energy while critically injuring both Gojo and Sukuna and tearing off one of the latter's hands.

After the battle continues, Sukuna slices through Gojo's arms and torso, defeating and killing Gojo, although he congratulated him for his efforts. Afterwards Hajime Kashimo rushes to engage in combat with Sukuna, as he comments for him to not disappoint. As he battles Kashimo, he reveals Yorozu's gift to him. The Supreme Martial Solution, a cursed tool that discharges electricity. He eventually gets overpowered by him due to his cursed technique, forcing Sukuna go back to his original form due to the injuries he recieved from his fight with Gojo.