Height: 172 cm
Affiliations: Straw Hat Pirates (Captain); Four Emperors
Devil Fruit: Gomu Gomu no Mi (Rubber-Rubber Fruit)
Devil Fruit Type: Paramecia
True Devil Fruit: Hito Hito no Mi Model: Nika (Human-Human Fruit)
True Devil Fruit Type: Mythical Zoan
Bounty: 3,000,000,000 (previously: 1,500,000,000, 500,000,000, 400,000,000, 300,000,000, 100,000,000 and 30,000,000)

Luffy is the captain of the Straw Hat Pirates and is best friends with all of them and values them over all else. At first glance, Luffy does not appear to be very intelligent, often seeing things in childish manner and can easily be amazed by the simplest things. However, because he views the world in a straightforward and simple manner, he is occasionally the only person who can see past the events and see what should be done.

Luffy seems to have an unstoppable appetite, a characteristic that is common to the Japanese archetype of the (at times simple-minded) young adventurer with a heart of gold; perhaps the hunger more so in Luffy's case due to having an elastic stomach. Luffy is also another one of the several characters given the middle initial "D".

Although Luffy is fairly lightheaded and a funny character, he has an unstoppable sense of determination, optimism and commitment and will do anything to stand up for his friends and comrades. Along with that, he has great courage to back it up as well as unbelievable strength. Ever since consuming the devil fruit he was shown to be not worried about his inability to swim, much like his brother. Much of these traits are common among D's. His only display of true fear is towards his grandfather, to the point that he does not fight back and is intimidated at the mere mention of him.

Luffy never kills any of the villains, no matter how cold-hearted they are; instead, he frequently sends the villain flying, knocking them out or until the point that they are almost near death, which results in some of the villains searching for revenge, such as Buggy the Clown and Alvida. Author Eiichiro Oda explains that it's not a question of morality so much as a matter of punishing the villains for their crimes - he feels that killing the villains lets them off too lightly, whereas he considers letting them live to see their dreams be ruined a far more fitting punishment.

Luffy has a dream, and to even have a chance at achieving this dream, he says that he must find the One Piece and become King of the Pirates. He knows that to achieve his goal, he will have to defeat many strong opponents, including the World Government and his childhood hero Shanks.