Jiraiya is one of the most popular characters in Naruto and is easily the man who Naruto developed the most under. In addition, Jiraiya is also one of the three Legendary Sanin and one of the strongest ninjas to ever live. However, despite how good this man was, he did have some really big flaws.
I mean, think about it, Jiraiya literally wrote pornographic stories and spied on girls in the bath. Jiraiya often even perved on Naruto and demanded that he transformed into a sexy lady. In fact, if Naruto had never shown that jutsu to Jiraiya, the old man would have never trained him.
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