Portgas D. Ace

Portgas D. Ace, born as Gol D. Ace and nicknamed "Fire Fist" Ace, was the adopted older brother of Luffy and Sabo, and son of the late Pirate King, Gol D. Roger and his lover, Portgas D. Rouge. He was adopted by Monkey D. Garp as wished by Roger to him before his birth. Ace was the 2nd division commander of the Whitebeard Pirates and one-time captain of the Spade Pirates. Hunted by the World Government for his lineage, Ace was captured and sentenced to death, which resulted in the Battle of Marineford in an all out clash of powers. Ace was freed, but he sacrificed his life to protect his younger brother from Akainu.

His death ultimately proved to be the catalyst leading to Luffy to train for two years to become strong enough to protect his friends, paving the way for the second half of the series. Although they were not blood related, Ace looked remarkably like his foster brother, Luffy. However, Ace was more serious looking than Luffy's lighthearted design, and was also taller and more muscular. He also sported rather childish freckles (inherited from his mother), and tended to make a skeptical facial expression by raising his left eyebrow. Interestingly, his facial features were almost akin to his biological father Gol D. Roger in his youth without his mustache. Ace's tattoos were among his most remarkable, trademark features. He had a tattoo on his back of the Whitebeard symbol — purple bones formed in a cross behind a purple skull with a white mustache — that he described as his pride and joy. Ace had another tattoo on his upper left bicep that spells "ASCE" vertically. The "S" crossed out is a tribute to Sabo as that's his jolly roger. On the cover of Chapter 596 indeed, Ace's tattoo is written as "ACE" instead of the original "ASCE" as the cover is a "what if" image of Ace, Luffy, and Sabo together as adults with the former being known to be alive.