Description
Koji Kashin (果心居士, Kashin Koji) is a clone of Jiraiya created by Amado . Being an Inner of Kara, he's in charge of the sector on the outskirts of the Land of Fire.
Kawaki ArcAs Koji continued to monitor Kawaki, he expressed concern on how it had been a while since Delta had been defeated yet Jigen had still not made a move, believing it to be unlike him especially as he had definitely learned about Boruto's Kāma and Naruto's personal protection of Kawaki from Delta. However, to his great shock, Jigen suddenly teleported to Kawaki's location through the Kāma he gave him and wondered if he could do that anytime then why would he assign a mission to retrieve Kawaki in the first place. As Jigen sensed the presence of Koji's toad, Koji dispelled it as he realised from the beginning Jigen had suspected him and had been baiting him to learn his true motives, rather than Koji probing Jigen's movements.
After Jigen dragged Naruto into another dimension, Koji waited patiently for Jigen's return. After some time had passed, he wondered why Jigen was still gone. While highly doubting Naruto could defeat Jigen, even if Sasuke were to arrive and help the Hokage, Koji theorised that the battle must have exhausted Jigen tremendously, viewing this as his best chance to kill the man himself. Koji then decided to return to the base.
Upon arriving, he learned from Amado that Jigen was only at 10% capacity. Also learning that Boro was safeguarding the sealed Hokage and Code was watching over the Ten-Tails, Koji decided he would use this opportunity to kill Jigen. Amado collected the essential for him to continue his work, and Koji summoned a toad. Delta arrived, intent on not letting them leave without Jigen's permission. Koji offered to deal with her, but Amado merely issued a shutdown command, making Koji wonder if his modifications contained similar measures. Koji gave him directions to follow, and reverse summoned his toad, with Amado, to the outskirts of Konohagakure, and proceeded inside the Kara facility.
As Koji approached Jigen in the Ten-Tails' dimension, Jigen excused Code while they talked. During their discussion, Koji secretly had a small toad act as a camera to relay the discussion to Amado. Quickly the discussion became tense, as Jigen revealed he knew that Koji and Amado sabotaged the blimp, letting Kawaki escape. As he asked Koji what his true goal is, Koji attacked him. While Jigen effortlessly countered the assault and struck him down, which was actually a shadow clone, Koji proclaimed he was created solely to destroy Jigen.
Koji's mask is destroyed by Isshiki, revealing him to be a clone of Jiraiya.
Koji continued his assault on Jigen, who easily repelled the various tactics, Jigen called him a tool for dedicating his life to one job. Koji however took that indifferently, proudly declaring that he is a ninja. Once luring Jigen into his trap, Koji summoned a massive wall of flames, knowing that the Kāma could not absorb naturally occurring flames void of chakra, to envelop Jigen. With the flames finally killing Jigen, this forcibly activated the final stage of his Kāma, making Isshiki Ōtsutsuki from inside of Jigen resurrect himself through his vessel. As Jigen was not fully compatible as a vessel, Jigen's was reformed as an imperfect recreation of Isshiki. Isshiki used his boost in power to instantly shrink and disperse the flames. He then began to shrink various targets about Koji, forcing the man to retreat. Eventually, Isshiki's assault destroyed Koji's mask, making Isshiki realise that the man was in fact a clone of Jiraiya.