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The nine-tailed fox is not a Kishimito invention. The villagers live in fear of this powerful beast, and thus Naruto himself is ostracized from society for most of his childhood.
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The most obvious and visible yokai in Naruto is Kurama, the nine-tailed fox demon that destroyed Konoha many years ago and which lies dormant within the main character, waiting to emerge again. In Japanese, the term roughly translates to "mysterious phenomena," and encompasses a wide array of strange creatures, ghosts, mythical beings, and other elements of the inexplicable. Nowhere is this more prevalent than in the presence of yokai. Though Naruto has many modern elements, there is undoubtedly a huge link to Japan's past running throughout the series. Bleach, a peer of Naruto, has a main character named Ichigo, or "strawberry." Kishimoto keeps the spirit alive in the Naruto sequel Boruto, with a character named Sarada, a reference to the Japanese pronunciation of the English word "salad." There doesn't seem to be any deep, underlying reason for this trend other than that it's fun, and Toriyama set a precedent that his manga descendants couldn't help but emulate. This use of weird or food-related names is a staple of boys' manga, undoubtedly influenced by Akira Toriyama's Dragon Ball, which includes characters like Gohan ("rice") and Bulma ("buruma," or "bloomers"). For Japanese readers, the name "Naruto Uzumaki" is much sillier than most English-speaking readers will notice at first glance.
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In Japan, an island country where fish is historically a large part of the diet, "naruto" or "narutomaki" refers to a type of processed fishcake, made to look like an "uzumaki," or spiral shape.
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Naruto's two closest companions at the outset of the series, Sasuke and Sakura, have fairly straightforward Japanese names, but his is more unique.
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