Ok,.I'm not one.who believes Luffy will have a Gear 4, but what I was thinking on what it would be if he does. I think if he ever gets it, he would inflate his muscles instead of his bones. That way, he would bulk up like Nightmare Luffy. The reason I see this not being implemented is because it may defeat the purpose of Gear 3.
What do you think?
What do you think?