luffy has the goal of becoming a pirate king after meeting with shanks the red hair who stopped at his native island fusha. the straw hat that characterized him was a gift from shanks and he promised to give the hat back to him when they met again.

luffy is a devil eating gomu gomu demon so he becomes a rubber man. this ability makes his body has the same attributes as rubber such as stretch electric silencer etc.

characteristic of the fight is to attack by lengthening the body. all the names of his stance always begin with the word quot gomu gomu quot and then followed by the name of weapon or artillery eg 39 gomu gomu no pistol 39 39 gomu gomu no bazooka 39 39 gomu gomu no gatling 39 etc. .

gear second technique speeds up blood flow but its organs are not destroyed because of the rubber attributes on its body. the effect of this second gear is the speed or agility increases. the word quot jet quot is also added in the name of his jutsu example gomu gomu no jet pistol . if coupled with haki his fists are causing an explosive effect.

gear third technique enlarges the bone by blowing it like a balloon. the effect of gear third is its attack power increases but the attack speed decreases. the word quot gigant quot is also added in the name of the moment example gomu gomu no gigant pistol . if the haki is added the hand becomes black and harder.

gear four the technique enlarges the size of a gorilla by combining boushuku haki. this strength is similar to the gorilla body with very strong destructive power. and coupled with the power of mentoring that can bounce up in the air. this power appears in dressrosa while fighting the donquixote doflamingo sichibukai .