Choso/Synopsis

History
As stated by Choso himself, Noritoshi Kamo, the man who experimented on his mother is in fact his third "parent" due to him having mixed in his own blood into Choso when his mother was pregnant with him. Although seemingly not remembering much about his own past, it is evident that Choso himself remembers Noritoshi and holds a grudge against him for toying with his mother and siblings' lives.

Choso is one of nine death painting wombs that came from a women capable of giving birth to cursed spirit children. At some point, Choso and his brothers were stored at the Jujutsu High, along with some of Sukuna's fingers.

Kyoto Goodwill Event Arc
Choso and his brothers, along with Sukuna's fingers were taken from the Jujutsu High by Mahito.

Death Painting Arc
Choso and his brothers are given bodies by Mahito, which Choso and his brothers decide to side with the cursed spirits since the world they envision will suit the brothers more.

Later, Choso is playing a board game with Pseudo-Geto and Mahito, when he senses that his brothers have been killed.

Shibuya Incident Arc
On October 31, Choso is with Hanami and Jogo in the curtain at Shibuya. When Gojo arrives at their location, Choso prepares to fight him along with the others. As they block Gojo's exit and surround him with people, Choso attacks with his blood manipulation technique, which Gojo blocks with ease. Choso then watches as Hanami and Jogo take on Gojo. When Gojo rips the branches off of Hanami, Choso attacks Gojo but the attack fails to connect. After killing Hanami, Gojo then turns his attention to Jogo. Choso attempts to assist Jogo by attacking Gojo, but his techniques fail against Gojo. When more humans are thrown down to the scene of conflict, Choso kills some of the humans with his technique, distracting Gojo. Gojo responds by activating his domain expansion for less than a second, greatly stunning Choso with his flawless technique.

After Choso recovers from his shock, he heads over to Mahito and Geto's location, where the Prison Realm had embedded itself into the ground. Geto explains that the Prison Realm cannot be moved while it is processing Gojo. When Yuji yells to informs the other shamans what had happened to Gojo, Geto informs the others of the shamans heading their way and asks for a strategy. Choso replies with his plan to avenge his brothers by killing Yuji and Nobara and to retrieve his other siblings from the school. Jogo isn't sure who Nobara is and adds on that they will need Yuji to turn into Sukuna, Choso responds that he doesn't care. Choso then listens as Mahito explains how they don't need Sukuna anymore and that they can now kill Yuji. As Jogo disagrees with Mahito, Mahito proposes that whoever meets with Yuji first, can decide was they want to do. Choso says that if he meet with Yuji first, then he will kill him. Choso then leave the station with the others, when most of them decide on these terms.

Later Choso encounters Yuji and attacks him. When Yuji gets close enough to land a punch, Choso defend himself but notices that Yuji's punch had made a double impact. Choso then asks if his brothers had left any final words with him. When Yuji says that they just cried, Choso becomes angry with his response and prepares to continue fighting Yuji. As Yuji jumps in the air, Choso figures that Yuji is baiting him but still launches an attack. The attack misses and Yuji manages to get close enough. Choso uses Supernova to wound Yuji's back and quickly stab Yuji's foot with a blood knife. Yuji ignores the pain and still continues, which Choso manages to stop the attacks by faking Yuji out. Choso uses Flowing Red Scale to overwhelm and then attacks with Piercing Blood but the technique was not fully completed.

Choso continues to attack from a distance until Yuji runs into the bathroom. Choso is hesitant to follow Yuji into the bathroom, until Kokichi manipulates Choso into entering the bathroom. Once inside, Choso finds out that the bathroom has been flooded with water and destroys the device that Kokichi was using to talk to Yuji with. Yuji suddenly attacks from behind, which Choso manages to defends himself but is sent into the water. Choso tries to attack with his blood but finds out that the water is making it harder for him to manipulate the blood that is outside of his body. Choso decides to use his flowing red scales again to increase his body's capabilities and fights Yuji in hand to hand combat. While fighting, Choso manages to have some blood that was not touched by water and uses it to attack Yuji with, while Yuji let his guard own. Choso thinks about how much damage he had taken from Yuji and prepares to continue the fight. Choso continues the fight, and manages to withstand the blows that Yuji throws at him. Choso manages to land a blow that knocks Yuji out and is about to finish Yuji off, but stops when a memory appears in his head. Choso is confused about this memory and leaves the area.

Due to being confused about the "memory" he was inflicted with about Eso and Kechizu having peaceful meal together alongside Yuji Itadori as another one of his younger brothers, Choso has now become convinced that Yuji is also one of his siblings and rushed to his side. Choso arrives on the battlefield and confronts Pseudo-Geto as his notorious father: Noritoshi Kamo. He asks why he made him try and kill his "little brother Yuji" and rushes towards him just as Uraume arrives and tells Choso to move, which Choso responds by telling Uraume to move as he's Yuji Itadori's big brother. Choso prepares to fight and uses Piercing Blood to strike Uraume before going after Kenjaku and engaging in close combat. Kenjaku tells Choso not to push himself and says he must be tired which Choso tells him that that is more than enough to put his life on the line for his brother. When Momo, Noritoshi, Yuji and Panda decide to try and attack Kenjaku, Choso continues to face off against Kenjaku but is frozen by Frost Calm used by Uraume.

Kenjaku tells Uraume not to kill them and that he needs a messenger. Choso says that the ice isn't enough to hold him and attempts to use Flowing Red Scale but is stopped by Uraume. Yuji who was the only one not frozen is able to free Choso. Yuji asks if Choso is their ally which Choso says no much to Yuji's confusion while Uraume asks Yuji who's body does he think that is. Choso tells Yuji that he's his older brother and tells Yuji to try and call him "older brother" once who ignores him. Choso watches as Momo tries using Wind Scythe but fails as Uraume blocks it with their bare hand. She tells Yuji and Choso that they're the only ones able to move and must buy time until Utahime is ready. Uraume uses Ice Fall which ends up freezing Yuji, Choso and Momo but everyone is saved by the timely arrival of Yuki Tsukumo who asks Pseudo-Geto what type of girl he's into.

Choso is unable to move and watches as Pseudo-Geto activates Idle Transfiguration which Tengen's barrier start cracking. However, Uraume's ice suddenly shatters and he along with the others frozen are freed. Pseudo-Geto asks Uraume what happened who responds poison where Choso reveals that his blood was mixed in with the Piercing Blood attack. When Geto summons several curses as he makes his escape with Uraume, Choso watches in shock before asking Sukuna if he's listening, saying that the Golden Age of cursed techniques is beginning once again.

Itadori's Extermination Arc
A despondent Yuji sits alone on a large staircase, as Choso approaches him, asking about his injuries. Yuji says that he is fine because of Sukuna, who he can tell is growing stronger. Choso says that he will be fine by himself while he collects the remains of Shoso and the others, telling Yuji that he can return to Jujutsu High. Yuji, however, replies that Sukuna has something planned for Megumi and that he himself has killed too many people, reminding Choso that he killed both Eso and Kechizu, his younger brothers. Choso calmly says that it was a misunderstanding and that forgiveness isn't involved when it comes to brothers. The pair then head out to deal with the rest of the cursed spirits.

Now outside, Yuji claps his hands together where two cursed spirits appear behind him and goes to try to attack him but fails. While Yuji is running, multiple other cursed spirits appear as well and follows him. Yuji leads the cursed spirits to Choso who's waiting in a tunnel. Choso uses Piercing Blood and kills most of the curses while one manages to get away from Choso's attack. Yuji punches the remaining curse and exorcises it. Choso takes note of Yuji's improvement from the last time they fought, fluid control over his cursed energy and physical strength. Along with that, he still hasn't fully recovered. Choso tells his "little brother" he's very impressive as Yuji asks him if he's still going to call him that where Choso explains he will continue referring to Yuji as "little brother" until Yuji remembers that his father had stitches on his forehead.

Just then, Naoya Zenin appears wondering where Megumi is. Naoya wonders if it's possible that he's the first one there and also if Megumi slowed down. Noticing Choso and Yuji below him, he asks the pair what they're doing and says that they stand out. Asking if they're even going to run much to Yuji's confusion. Naoya tells Yuji now that Gojo is sealed, his death sentence is back. He tells the two that his business is with Megumi and adds on that he doesn't care if Yuji lives or dies. Naoya adds that he can't have Yuji running around so he'll start by breaking Yuji's legs as he asks what Naoya wants with Megumi. Naoya says that he wants Megumi to die but before he does, he wants Megumi to do something. He jumps in-between Choso and Yuji, surprising the two with his speed. Both Choso and Yuji fight Naoya who's able to parry both of their attacks with ease. Naoya suddenly moves away from the two as Yuji says that he's incredibly quick. Choso adds on that it's most likely a cursed technique that Naoya is using. Naoya comments on how Yuji's tougher than he thought and adds on that he didn't expect much from Sukuna's vessel. Naoya wonders if he should try increasing his speed. However, the fight is interrupted by Yuta Okkotsu's arrival who comments on how Yuji isn't alone.

Yuji asks who Yuta is as he jumps down, shocking both Yuji and Choso. Choso comes to the conclusion that Yuta is Yuji's executioner. Naoya notices Yuta's immense presence presents himself as his ally as Yuta asks who he is. While Yuta is talking to Naoya, Choso tells Yuji that he must run where Yuji asks why he must run. Choso tells him that Naoya is a speed type but his speed has a hidden trick. He says that having Naoya chase him would be troublesome and that he will take him on. Yuji asks if Choso will be alright who confirms before adding on that the one Yuta and Naoya wants is Yuji. Choso thinks to himself about how Yuji won't have to feel bad for leaving him behind and having to fight the jujutsu sorcerers. He tells Yuji to just think about running away from Yuta and adds on that he most likely will be the same type as Satoru Gojo, Choso tells Yuji that he'll meet him at the same spot as yesterday.

Preparing to fight the two, Choso is taken by surprise when Naoya Zenin prevents him from chasing after Yuta who chases Yuji. Choso wonders if they thought that he'll try to block Yuta before fighting Naoya. During the initial scuffle, Naoya says that he saw Choso fight earlier and says that it's Blood Manipulation. He says that he's unsure of why Choso has the inherited technique of the Kamo Family. He adds on that outside of Piercing Blood, blood manipulation isn't that frightening. He says that in order to use piercing blood, he will need to prepare beforehand to use it. Naoya then tells Choso that this is checkmate and he will die. The fight is taken to an underground passage where Naoya blitz past Choso's defense and manages to use Projection Sorcery on the latter.

He smashes Choso into the passage wall as Choso thinks to himself about how fast Naoya is. Choso is unaware of what technique Naoya is using but whatever it is, he doubts Naoya will disclose it as he's over powering him. Naoya comments that Choso is a tough individual and asks who he is who says that he's the oldest of ten siblings before activating Flowing Red Scale: Stack. Naoya says that isn't an answer before adding on that his question was asking about his cursed technique and toughness. He tries bypassing Choso's defense but Choso is able to adjust to Naoya's speed which surprises him. However, Naoya punches Choso and sends him crashing into the wall. Naoya tells Choso that he always acts on the assumption that he'll have a counter.

Choso is surprised that he's bleeding as Naoya revealed that during the attack, he uses a knife and stabbed Choso in hopes that he'll bleed out. Naoya makes an off-handed comment about his brothers which prompt Choso to talk about his brotherly bonds. Choso adds on that because of his brothers, that's how Naoya is who he is who gets irritated. Choso starts bleeding profusely which shocks Naoya who wonders how Choso is still able to live despite the large amount of blood pouring out of his wound. Due to the wave of blood, Naoya's sight on Choso has disappeared where Choso is able to move to a different location and tries using piercing blood to attack. Some of Choso's blood lands on Naoya's hakama which weights him down, confusing Naoya who wonders if Choso is controlling the blood. Choso tells Naoya that this is checkmate, Naoya asks if he's sure about it before running towards Choso. Choso then activates Supernova as Naoya closes the distance and manages to defeat Naoya while also poisoning him in the process.

Suddenly from behind Choso, Yuta is dragging the limp Yuji behind him. Choso turns around in confusion but is knocked unconscious by Yuta.

Culling Game Arc
While Yuta, Megumi and Yuji are talking about Master Tengen's barrier, Choso interrupts the conversation startling Megumi with his sudden appearance where Yuta is surprised that Choso was listening. Choso says that there may be some way to past the barrier. He says that Mahito once managed to steal Sukuna's finger along with the Death Paintings and that they can do the same.

Choso along with Megumi, Yuta and Yuji later arrive at Tokyo Jujutsu High and finds Yuki Tsukumo with Maki.