WRITTEN BY RIYA DUBEY
Kashin Koji is a clone of Jiraiya. Amado, the genius scientist of the organization of Kara, took Jiraiya's DNA and created his clone.
As he is created from Jiraiya's DNA, it is not surprising that Koji shares similarities with him that goes beyond physical appearance.
Jiraiya is extremely powerful and was one of the strongest ninjas in the series. However, even the legendary sannin cannot win against Koji.
Koji and Jiraiya share some similarities and their Jutsu is one of them. Jiraiya was very adept with Fire Jutsu and used it frequently, Koji can do the same.
In addition to that, Koji can use every Jutsu Jiraiya can. Jiraiya can manipulate his hair with Jutsu to act as a weapon and that is another thing that Koji learned.
Koji's Rasengan is more powerful and bigger than Jiraiya's which gives him an advantage. However, the biggest and the most tangible advantage that Koji has over Jiraiya is the sage mode.
It was mentioned in the anime that people who master the sage mode have sage markings on their faces, but they don't have the features of a toad.
Jiraiya had that but Koji has successfully mastered the sage mode and has no such features. Thus, as it turns out, the clone is more powerful than the original.