Here is the One Piece Gear 5 explained. This is what Luffy's new power does and which episode he gets it in.
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If Luffy's fruit is a mythical zoan, and gear 5 (Nika Man) is supposedly his full form, does that mean that the other gears were hybrid forms? - Quora
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What Episode Does Luffy Use Gear 5 in One Piece Anime?
One Piece Gear 5 Explained: What Is Luffy's New Power & Which Episode He Gets It