Black Leg Sanji

One of Sanji's most easily noticeable characteristics is the kind, calm, cool, and collected manner in which he carries himself. He tends to speak in a very composed manner, even in dire situations, and rarely acts without thinking. His demeanor in a lot of ways can be compared to that of a secret agent. This is amplified by the fact that he tends to wear a suit, very often enjoys a smoke, and in the anime, they tend to play smooth music with jazzy undertones when he speaks. He quite often makes comedic exceptions to this, such as when in the presence of beautiful women, or when angered by a crew member.

Like Zoro, he is more perceptive than he seems, and often tells people what they need to hear instead of what they want. Hence, he is seen as one of the more hardened members of the crew. For example, when the Straw Hats first meet Laboon and learn that the whale had been waiting for 50 years for a reunion with his crew, it is Sanji who immediately (and correctly) points out that Laboon's crew is most likely dead. Sanji does possess an optimistic and idealistic side. His dream is to find a sea that even other cooks consider mythical. Furthermore, even after the abuse, he experienced from his family as a child, he held out hope that they may have changed for the better. However, this hope proves to be completely futile, but he was angrier than surprised at the revelation, showing that he maintains a healthy sense of skepticism even at his most hopeful. Sanji also showed a high degree of faith in his fiancée, Charlotte Pudding, and was horrified and downcast when he discovered her true motive.

Like Franky (and unlike Zoro), Sanji is not afraid to show his emotions when the moment calls for it and is entirely capable of crying or losing his temper, which results in Sanji's short fuse and subsequent beatings of most villains (and Luffy). In fact, a running gag has appeared since Sanji's fight with Jabra, during which he stated that when he gets angry, he "heats up". After this fight, when Sanji gets particularly angry at a villain, he appears to burst into flames. This occurs with both Absalom and Duval, though the latter example appears only in the anime. It is also seen when Luffy states nonchalantly that he is friends with Boa Hancock, considered to be the most beautiful woman, when she appears to prevent a Marine ship from sinking the Thousand Sunny.

Despite his hardened outlook on life, Sanji does not object to acting foolishly on certain occasions, like dancing with the more immature members of the crew (Luffy, Usopp, Chopper and Brook), or acting childishly excited in certain situations (like when they first visited Skypiea) and he was also the crewmember who enjoyed going to Fish-Man Island the most as he was seen partying with mermaids. He is also one of those who believes that afros give power.

Sanji seems to enjoy relaxing with a cup of tea (his favorite drink) as seen when he entered Mr. 3's wax house and helped himself to Miss Golden Week's tea set. This habit came up again in Enies Lobby when Kalifa distracted Sanji by offering him tea; in another instance, Sanji angrily refused Bege when he was offered something to drink while trapped inside of Bege's body.

Since at a young age, Sanji has a habit of saying "shit" or "shitty" when describing something. While the Japanese word for feces, "kuso", is not specifically an expletive, Sanji's manner of speech makes the term sound brash. For example, he might call a person he especially does not like a "shitty bastard" or something along those lines (such as his personal nickname for Zeff, "shitty geezer"), but he also described something pleasant to him, like being alone with Nami, as "shitty fantastic" and "the shitty best". In the Funimation dub, this habit is downplayed to swearing that is less offensive. He does admit that he is not perfect. He convinced Usopp to let him fight Jabra, because of their differences in abilities. He admitted that he was stronger than Usopp in terms of physical strength, that they both had things they could not do and things they could do and because of that, they can help each other. This inspired Usopp to realize he was the only one who could save Robin by using his marksmanship. Sanji is also able to think one step ahead in most situations, making him extremely clever compared to his other crewmates. The first example was seen during the Little Garden Arc, in which he fooled Crocodile into thinking he was Mr. 3 and lied about having killed the Straw Hats, allowing the crew to reach Arabasta without Baroque Works pursuing them. Later on, when the rest of the crew was captured by the Warlord, Sanji (with the help of Chopper) outwitted him using a Den Den Mushi despite Crocodile's reputation as a meticulous schemer. Another example is when Nico Robin was captured by the CP9, he somehow knew (or was able to deduce) that the CP9 were going to take Robin to the station. He was seen at the station hiding before the CP9 even got there. When these events go as he planned, he has a habit of saying 'Bingo!'. He is extremely amorous, constantly flirting with any attractive woman he sees, earning him the nickname "ero-cook" from Zoro. Even as a child, while working in Baratie, Sanji would become love-struck with attractive female customers and end up making mistakes in the process, much to Zeff's irritation. Since, and a while after, this romantic nature is a hassle for the rest of the crew in times of crisis. Returning to Sabaody Archipelago after his two years on Momoiro Island, Sanji became even more perverted due to not having seen a woman in two years, making lewd faces when he so much as thought of beautiful women (primarily his crewmates, Nami and Robin) and acted strangely when he got close to 'real' women, causing others to question about his health. He is even attracted to Kaidou's son, Yamato, despite the latter identifying as a man and being addressed with masculine terms while biologically being a woman, and therefore was in favor of him joining the Straw Hat Pirates.

He is also known to show jealousy towards others when their luck with women appears better than his, with an example of this being his reaction upon learning that Luffy spent his two years during the timeskip on Amazon Lily and being very close to both Boa Hancock and the mermaid Shirahoshi, as well as his reaction to Momonosuke continuously being allowed to go places like the women's room that Sanji himself would be prohibited. He is also amorous toward females of different humanoid species such as mermaids, giants and minks. He became jealous of Zoro for saving Kozuki Hiyori and getting her attention after Kaidou's defeat.

Sanji considers himself handsome and charming, often comparing himself to a fairytale prince (while ironically already being a prince himself). Though this trait has not been explicitly noted by others (similar to most of the male characters), there are times where ladies are interested in the cook, like after rescuing Cocoyasi Village from the Arlong Pirates a whole group of women gathered around him (anime), the female bounty hunters at Whisky Peak and the female members of the Foxy Pirates also took an interest in him (but both of these times they were merely fooling him, making him drop his guard) and more recently, the mermaids of Fish-Man Island were very captivated with the cook and played with him in the water causing Sanji to cry with happiness. The most significant woman to become attracted to him was his ex-fiancée Charlotte Pudding, who despite having been arranged to marry him as per her mother's orders, she ended up falling genuinely in love with him because of his kind heart (interestingly, he seemed to take her lovesick attitude in stride, though this could be because he was focused on saving his crew from her mother and reuniting with them). Pudding even became the first person to kiss him on the lips (though she removed the memory with her Devil Fruit powers afterwards). At other times when Sanji is full of himself, he tends to be brought sharply back to earth by the people around him (such as being called the "Prince of Dumb-ass Kingdom" by Zoro, prompting Sanji to attack him).

Despite his perverted nature, Sanji has some degree of self-control, stemming from his loyalty to his crew, as is shown by the fact that in spite of being attracted to Pudding, he sternly refused to marry her and thereby decided to let her down gently.[21] Though he is capable of self-control, Sanji can still allow his extreme lust to control him and warp his perception of a situation; in spite of his knowing about Pudding's malicious nature as well as her intention to murder him, Sanji still found himself deeply captivated by Pudding's beauty and seductive words and physically struggled with himself. However, when the moment called for it, he was stoic when Pudding tried several times to assassinate him, disregarding her feeble taunts and suggested to her that she was lying to herself.

Sanji is conscious of his romantic nature but feels no shame throwing himself at beautiful women. When forced to agree with the marriage with Pudding for the sake of his loved ones, he told himself to act like his old romantic side "love cook" despite feeling the grief of being separated from his friends and the danger they were in.[22]

During his time on Momoiro Island, Sanji showed his resentment to putting on a dress and losing his manhood. He bluntly declared to Ivankov that he is a man among men who was born to love the ladies and not to be friends with them. To this end, Sanji resisted becoming an okama for two long years.

Sanji will often get so caught up in what he calls a "hurricane of love" that he becomes downright delusional. He often imagines himself bursting in on a horse to save Nami or Robin. At Water 7, he went overboard by not only leaving Nami a confidential letter but defeating its purpose by writing Nami a very obvious message for her and only her at the Blue Station when he went off to sneak onto the Puffing Tom, which said that whoever else read it were all idiots, managing to annoy Nami once she spotted it.

Whenever he prepares a meal or a drink for his female crewmates, he dislikes it when his male crewmates start griping for not receiving any other food from him and then bickers at them to make their own food or tells them they were undeserving. If they try to sneak food, he is also quick to punish them, especially Luffy, against whom he has gone to great lengths to protect the fridge from being raided on the ship.

At Wano Country, Sanji was given the task of using his cooking to gather Kin'emon's allies, but he instead used his cooking solely to attract women, managing to irritate Nami when she saw this.[23] Later on, he was more interested in hearing Robin's opinions about the taste of his soba noodles and snarling at Franky when he was making a suggestion on how to attract samurai.[24] During the raid on Onigashima, Sanji immediately shifted his focus to finding prostitutes after coming across a brothel. However, Sanji became focused on the raid again to save Momonosuke from execution and to prevent Luffy from wasting his strength on needless fights.

As an inveterate womanizer, he refused to offer submission for Black Maria screaming that he will love all women.[25] After the two year timeskip, Sanji's hair now covers his right eye, shows his left eye which also has curly eyebrow. He has grown his hair just slightly longer. He also sports a dark goatee, and stubble on his upper lip. Both his left and right eyebrow are curled to the right. Sanji's neck has gotten thicker as well, similar to Luffy and Zoro. He wears a black and yellow 3-piece suit. In Punk Hazard, he wears a full black three-piece suit.