Monkey D. Luffy

Luffy's most dominant traits are his apparent lack of common sense, his utter fearlessness and unwavering belief in himself. He generally marches at the beat of his own drum, unwilling to approach anything in a delicate or nuanced matter. That said, Luffy has a penchant of being able to see through the heart of the matter, often able to accurately call out someone's personal flaws such as Koby's cowardly nature or Kuro's weakness as a pirate. He is profoundly ambitious, frequently declaring he will become the Pirate King and devoting his entire being into being one. Luffy's personality can be described as childlike, in the sense that he tends to go to the extremes. He can either be extremely greedy, especially in cases of food, who his crew is, and adventure; or extraordinarily selfless, going so far as to virtually sacrifice himself to avenge or protect his friends, crew, and family. This childish mentality does not prevent him from often getting to the root of the problem and allowing him to figure out the simplest way of solving it. Shanks has had a profound effect on Luffy's personality, as prior to meeting him, Luffy was arrogant, impatient and extremely prideful. The thought of Shanks being humiliated by Higuma infuriated the young boy, and he recklessly tried to get his revenge. After meeting Shanks and being inspired to become the Pirate King, Luffy eventually grows up to become more like him - opting to become calmer, patient, and avoid letting things get to him. Early on, he would occasionally repeat some of Shanks' lines to other people, like during his first meeting with Usopp. With that said, Luffy is very much his own person and fairly different from Shanks overall. On occasion, he will still lose his cool and get angry, though this aspect of him has lessened considerably since the timeskip. Above all else, Luffy dislikes weak people, though not strictly in a physical sense. He has openly told Koby that he "hates people like him" due to Koby's frequent use of phrases of "it's impossible" and his cowardly nature. Conversely, he likes people who put in the effort to make something of themselves, despite their limitations, and has come to appreciate Koby after seeing him put his life on the line. He calls out Kuro for complaining about being a pirate, taking less issue with his crimes and more with his desire to escape the life of being a pirate. Luffy frequently expresses wonder of the simplest things, such as hermit crabs, and can be confused by concepts such as that by digging a hole right next to another he may be unintentionally filling the other hole. In addition, during long and complex explanations of something, he immediately calls it magic. He likes monsters and will ask weird creatures to join his crew (as seen in the Thriller Bark Arc, asking a talking tree to join his crew). He has an appalling lack of knowledge for medicine: when Nami had a high fever, he told her to eat cold food and later tried to make Roronoa Zoro better (after battling Bartholomew Kuma) by pouring sake onto him, because Zoro likes sake. When attempting to think up a plan to get off of Amazon Lily, whilst he managed to make some logical sense of where to look, he is seen to strain himself and noted that he is going to feel sick from too much thinking. He is rarely disturbed by violence and bloodshed, as he has fought his whole life. Even the worst battlefields rarely disturb him, except when it involves a friend or relative, as in the case of Ace. Despite his reckless and energetic disposition, Luffy also has a penchant for silent reactions in general. He is seemingly unfazed by the most horrifying sights, such as pirates dying before him, headless men left after Law's attacks or the extreme violence from various devil fruit users in general. He almost never gets irritated with normal people, though there are a few exceptions. Luffy gets irritated at people who have different tastes in food as him, and dislikes it when people try to look at his "privates." He also doesn't seem to like it when people play and stretch with his rubber body while he eats but doesn't have much of an issue with it otherwise. On a more serious note, he is actively annoyed at people who tell him things are "impossible" and will even hit people (men or women) who push the issue too far. People who betray their comrades outright disgust him, regardless of how awful said comrades might be. His irritation can extend to his crewmates too, particularly when they whine about the dangers, he tends to put them in, or when they go too far, such as his clash with Usopp. Luffy calls every mixed-appearance creature he finds by whichever creature is its secondary (non-dominant) part. On Gaimon's island, the dog/chicken was referred to as a "chicken" when it was mostly a dog, the snake/rabbit a "rabbit" even though it was mostly snake, and the pig/lion a "lion" even though it was mostly pig