This question already has an answer here:

From the first episode of One Piece Luffy chants "Gomu Gomu No" to start his attack, it is also seen in other devils fruit users too. Is there any particular reason for it?

marked as duplicate by Ashishgup, Community Dec 7 '15 at 11:57

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


All fruit users in one piece can use his fruits powers freely, the reason for Luffy and every other to put a name to all actions and shout it in battle is only a trope of the shonen style anime.

This fact can be checked by seeing Luffy "loosing" his head when he ate the fruit, or any logia user making his body ethereal without saying a word. Or moments when characters "invoke" the name after doing the action itself.

Not the answer you're looking for? Browse other questions tagged or ask your own question.