The other day I came across this story on Fanfiction.net here is the link: Disharmony of the Leaf and it got me thinking about how things would turn out if villains, major and minor, of MLP ended in Leaf and meet certain characters, not just Naruto.

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I just did something like this a long time ago. I thought of a story of de aged Sirens meeting Kakashi.

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Sounds interesting. I had an idea about Hinata finding a summoning scroll for the sirens, who are based off justice's versions of them.