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 ...

For instance, when it comes to the weakness of Gear 3, which was Luffy essentially turning into a chibi version of himself, ...

Luffy's actions in liberating kingdoms and fighting in wars make him a hero in One Piece. Being a hero in the series is subjective, with differing perspectives on characters' heroic qualities ...

King And Queen never fought Luffy during the Raid on Onigashima and faced Zoro and Sanji instead. Luffy and Eustass Kid never had a major fight despite being rivals and allies against common enemies.