Luffypirateking

Luffy has gained extraordinary stretching powers from eating the Gomu Gomu no Mi (lit. Rubber Rubber Fruit, Gum-Gum Fruit in the English dub), which is one of the rare and legendary Devil Fruits. After consuming the Gomu Gomu no Mi, Luffy’s body becomes like rubber, giving him the ability to stretch long distances. Having trained hard for ten years, Luffy is able to supplement his stretching powers with immense strength, agility, and creativity in combat. His fighting style is largely improvised, and heavily reliant on his Devil Fruit. It should be noted, Luffy can’t automatically stretch his limbs (like superheroes with stretching powers, i.e: Mr. Fantastic or Plastic Man) since his body acts more like a rubber band, thus has to throw some force into it in order for his limbs to stretch out. However, he can hold his limbs outstretched for a long time, as seen when he reaches his arm out about half a mile to retrieve Usopp from Water 7.
Luffy uses his stretching power in ingenious ways. He is able to use the malleable stretchiness of his limbs to gain tremendous velocity and hit enemies with devastating impact. His rubber body is also extremely durable and virtually immune to blunt objects such as bullets (in One Piece, bullets are still round pellets), punches and electricity, either reflecting off his body harmlessly or being absorbed into him. It’s even become a running gag that people find out the hard way Luffy is made of rubber when they shoot at him, only to have the bullets bounce right back. Another running joke is that whenever Luffy’s body is in peril that would kill a normal human, he says that he’s made of rubber, so it’s okay, or acts like something was a small problem despite the person trying to kill him, such as being shot in the heart. However, he is still normally susceptible to sharp objects such as swords and knives. He can not only use his ability to increase the range and strength of his attacks, but he can also use it to restrain and even control foes like puppets.
Like all Devil Fruit users, Luffy cannot swim, however, unlike other Devil Fruit users, he doesn’t avoid water sports. Even though blunt objects do little damage to him, sharp blades or pointy weapons can harm him, as well as nonphysical attacks like heat, poison, cold, and dehydration.

Luffy is renowned for wearing his trademark Straw Hat (from which he gets his nickname “Straw Hat Luffy”) which was lent to him when he was young by the legendary pirate captain, “Red-Haired Shanks.” His outfit somewhat mimics Shanks’ own outfit in that he wears short pants (although his are much shorter than Shanks’) along with sandals and a vest. Luffy has a scar underneath his eye (he got it in Chapter 1) and short black hair. He appears to be somewhat scrawny, however underneath his shirt he has a surprisingly well built physique.
Luffy, for the most part, has the same outfit over most of the series, as opposed to the rest of the crew. Luffy may wear a different outfit to suit the climate of an island (like a hooded parka Drum Island or desert robes in Arabasta), but will switch back to his trademark vest and shorts after the adventures on that island are over.
Though Luffy prominently wears a red vest and blue shorts, he will wear his usual outfit in different colors. For example, in Enies Lobby he wears black shorts because they had pockets in which he could carry meat, on the Thriller Bark Island he wears an orange vest and red shorts, and on the Sabaody Archipelago he wears a blue vest and dark blue shorts. During the break in at Impel Down Luffy has been shown wearing a light blue vest with red shorts and after the fight between Magellan and Luffy, Inazuma gave to him a yellow vest. He does, however, no matter where he is, wear his Straw Hat through absolutely everything, though at the start, the hat was prone to getting knocked off his head easily, forcing Luffy to either put it aside or have someone hold onto it during battles, he has since gotten a string strap for it which Nami sewed it, allowing the hat to hang from his neck during fights.
During his return to Marineford to give a silent prayer, Luffy was shown with 4 characters written on his right arm spelling 3D2Y, with the 3D crossed out to symbolise that the Straw Hat Pirates should meet up in 2 years (2Y) rather than the 3 days (3D) intended after fleeing from Sabaody Archipelago. The writing was removed sometime after Jinbei left for Fishman Island and before Luffy and Rayleigh got to Rusukaina Island.