With the unlocking of Gear Five, we learn that Luffy's devil fruit is not actually the Paramecia type Gum-Gum fruit, but the Zoan-type Human-Human fruit, Mythical Model: Sun-God Nika. The Sun-God ...
However, due to the nature of his Devil Fruit, possessing the powers of the Sun God Nika, many One Piece fans believe that Luffy is only able to keep up with strong characters in the series ...