It is simply an adorable Chibi Luffy, and frankly, that's enough. Luffy's fourth power up, Gear Four, actually has multiple types of forms, within itself as a form. These are Tankman, Boundman ...

It is reminiscent of when Luffy would become Chibi Luffy after he first developed Gear Third. There is not really much to this form at all, as it is merely a side effect and not made to be used in ...