After surviving his encounter with Isshiki Otsutsuki, a fate no one expected him to suffer, Koji Kashin escaped and never appeared again in borutobut his specific skill set makes him come back after all but guaranteed time.
Koji Kashin’s first appearance in chapter #15 of Boruto caused a stir among fans. Koji’s similarities to Jiraiya, the fan-favorite Naruto character, are so uncanny that many believe creator Masashi Kishimoto decided to resurrect him after his heartbreaking death trying to trying to stop Pain, his former student. While Koji is not a resurrected Jiraiya, he is probably the next best thing – a clone of the legendary shinobi. It’s the connection between the two characters that suggests that fans will see his final return to the story when Boruto returns from the passage of time.
Amado chose to clone Jiraiya because of his devotion to Konoha
Koji was created by Kara’s Amado, ostensibly one of Jigen’s top lieutenants. Amado used the DNA he inexplicably came from Jiraiya’s body after his death. Assuming that Amadao has access to the DNA of any number of shinobi of equal skill, an ongoing debate within the Boruto fan community is why Amado chose to copy Jiraiya. The answer is that Amado never intended for Koji to obey and follow Jigen. Instead, convinced that it was necessary to stop Jigen, Amado chose someone who, among other attributes, was mentally tough, dedicated to protecting Konoha, and above all, proud to be a ninja. .
These are all required traits of someone who works closely with Jigen but is completely unaffected or alienated from his or her true goals. Amado also knew that a clone of Jiraiya would be able to work independently and unattended to take down Jigen. This will provide cover for Amado to make other attempts to sabotage Jigen while also providing him with the ability to reasonably refuse if Jigen finds out about Koji’s plans.
Koji’s survival ensures his return to Konoha
As described in Boruto chapter #47, while Amado created Koji as a weapon against Jigen, it was never intended for him to actually survive his confrontation with the mighty Otsutsuki. Instead, he simply wanted Koji to be able to draw Isshiki at a time of vulnerability so that he could eliminate him when he was at his weakest. Koji was actually able to complete the mission, but surprisingly he was also able to escape death and disappear. It makes sense for Koji to keep himself informed of what’s happening after Jigen/Isshiki’s death, including Code’s fight against Kawaki and Boruto, Amado’s defection, and Eida’s arrival in Konoha. More importantly, Jigen may be aware of Kawaki’s betrayal, and it is likely that he will actively assist in protecting Konoha and helping Boruto.
Like Jiraya in Naruto, Jigen he can offer to train Boruto, Sarada or Sumire in preparation for what’s to come. Maybe he did it, during the skip. He can also do whatever it takes to remove Code and the rest of Kara as a threat, or he can simply wait for the conflict to begin, then rush to assist. whichever faction he believes in. in fact Koji Kashin still alive making it almost impossible to see again in boruto.
boruto available to read from Viz Media.