Luffy and Ace (gah! I can't look at Ace without imagining that! Guys I'm so sad!)
Luffy and Fire Ace have a very close relationship. They grew up together in their hometown and during the fight together, Ace always won though Luffy had eaten a demonic fruit. Luffy has no grudge against Ace even though Ace always wins, but instead of being proud that he can win right now (although Luffy still seems to admit that Ace is still stronger, he claims During the war in Marineford, he would eventually overtake Ace one day.
Although in the battles they fought, Ace always protects Luffy from Garp, but Garp still maintains that Ace will have a bad effect on Luffy. And because of this protection, Luffy is ready to break into the world's most dangerous prison and then head to the Marine Headquarters to save Ace. Although loving each other as brothers, Luffy always makes Ace angry and worried because of Luffy's recklessness. Thus, Ace easily trusts Boa Hancock when she tells him that Luffy has broken into Impel Down to save him. Even when near death, Ace is still angry at Luffy's recklessness, while Luffy loses his life when he sneaks into the world's largest prison, losing 10 years of his life, and even taking the lead. His hands to attack Magellan. Luffy loved his twin brother so much that he was ready to fight at the same time all three admirals and said that he would save Ace even if he lost his life.
While Luffy considered Ace as his brother and even acted like him, one thing was revealed, the time before the execution, Sengoku said Ace was the son of Gol D. Roger, and he chose his mother, Portgas D. Rouge, to make them brothers through adoption. It is recalled that Luffy and Ace met for the first time when they were young, which meant Luffy was aware of the incident. When this happens, Luffy has a straw hat and a scar under his left eye, which means now that Shanks left Fuusha and gave his straw hat to Luffy and Luffy for eating Devil Fruit. by the time it was 7 years old. It is revealed in the flashback that Luffy was sent to live with Ace and his guardian, Dadan, because Garp thought that living in Fuusha made Luffy "too weak." Ace was quite hostile to Luffy At this point, even spit on Luffy before they are introduced. Luffy, however, constantly tries to make Ace become his friend, after following him everywhere. Finally, Ace mentioned before his death, Ace became interested in Luffy and they officially became brothers.
Luffy becomes extremely distressed after Ace's death, so he loses control, in fact, Luffy collapses, Jinbei says that his coma is to protect him. Indeed, when Luffy woke up, all he could do was scream in pain and wish all was a nightmare, and he would wake up soon. His losses eventually have an important impact on Luffy, making Luffy admit that he does not deserve to be the Pirate King, this is Luffy's first time to say this. He only escapes from his depression after Jinbe makes him realize that Ace has relied on Luffy's safety in his teammates.
After spending two years practicing Haki, Luffy seems to have alleviated his pain as he was able to talk about Ace's death.
