If there's one thing consistent in One Piece, it's how Luffy has continuously pushed the boundaries of his abilities, with Gear 4 serving as one of his most powerful transformations (second only ...

This article contains spoilers from One Piece's Elbaf Arc. Luffy's mastery over Gear 4 allows him to use it in specific body ...

Luffy's attacks have changed greatly as One Piece has gone on. Here's a closer look at how much they've changed.

After learning Haki, Luffy managed to combine it with his Devil Fruit powers, and ended up creating Gear 4, which works on the concept of inflating muscles, as Luffy calls it muscle balloon.