Who uses Rengoku Sword in One Piece?
Seems like there's a bit of a mix up here! No one in One Piece uses a Rengoku Sword. You might be thinking of Rengoku Kyojuro from Demon Slayer, who's famous for his firey sword techniques. In One Piece, swords are a big deal, but Rengoku isn't one of them. The closest in terms of fire powers would be Portgas D. Ace with his Flame-Flame Fruit abilities, not a sword though!
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Whoops! Looks like wires got crossed. One Piece and Demon Slayer are two different worlds. Rengoku and his fiery sword are from Demon Slayer. In One Piece, we've got plenty of cool swords but none by that name. If swords are your thing, keep an eye out for Roronoa Zoro's collection in One Piece - now those are some epic blades!
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