Yes, that’s right, you read that correctly, the Time Slip arc was 100% canon, which means when Kara member Kashin Koji makes his long-awaited anime appearance, Boruto could have flash-backs to the time he met Jiraiya in the past. Also, I ma aware that Koji technically appeared earlier in Boruto but as a hooded shadow and for a split second so, I’m talking about when he will actually reveal himself obviously.
First up, let’s explain to what all Boruto anime fans might be unaware of and that’s all the speculation around Kashin Koji being Jiraiya was basically correct. Well, in a way, as Koji isn’t the real Jiraiya and is in fact, a clone of the man. Still though, this is pretty exciting stuff and not something too out of the ordinary either, as synthetic humans have played a big part in the Boruto manga and anime to date, as well as briefly in Naruto Shippuden too.
Now, let’s talk about this canon Time Slip Arc. As many of you anime fans are aware, canon refers to content created by the manga illustrator in the manga and then animated afterwards. However, in relation to the Boruto, Full Metal Alchemist and the Dragon Ball Super anime’s, that’s not always the case.
In fact, there are several anime-only arcs and episodes that are considered canon in the Boruto anime, despite them not being in the Boruto Naruto Next Gnerations manga. Here is a full list of every anime-only episode that is considered anime canon: 1-15, 25-32, 34-38, 42-47, 52, 60, 70-92, 98-103, 112, 120-138, 141-147, 154, 157-180.
They travelled to the time of Naruto part 1 and met all the young versions of the characters of classic Naruto, which included Jiraiya. By the way, the Time Slip Arc took place between episodes 128 and 136, where Sasuke Uchiha and Boruto Uzumaki travelled back in time hunting Urashiki.
Furthermore, this isn’t even the first time time travel appeared in the Naruto universe but it is the first canon reference. Road to Ninja: Naruto the Movie also showcased time travel but again, it wasn’t considered canon at all. Therefore, in conclusion, it’s possible that when Kashin Koji appears in front of Boruto, the young son of the Seventh Hokage could in theory, have memory flashes of the time he met Jiraiya in the past and have those flash-backs be completely canon.