— Roronoa Zoro

Everyone thinks that Zoro hates Sanji, but that's a lie. He has a love-hate relationship with the cook, but he doesn't entirely hates Sanji. He doesn't like the way Sanji treats women because it's different from men. Sanji treats women with affection, flirts with them, and refuses to fight with them, even if necessary (and if he fights, he doesn't hurt them, not a single scratch, nothing.) But with men? Sanji often treats them with ignorance, or without much special manner. He treats them differently, and Zoro finds this annoying because he thinks that gender is not what defines the way we should be treated. Zoro is always shown to compete with Sanji, getting into fights with each other over petty matters, often at inopportune moments. They had some early disagreements with each other during the Arlong Park Arc on how to deal with Nami's alleged betrayal, but their back-and-forth relationship officially began on Little Garden when the two competed in a hunting expedition. Their rivalry extends to Sanji's cooking, as Zoro rarely acknowledges its quality, usually just calling it "okay". Zoro also has a habit of insulting Sanji when he is flirting with Nami or Robin. Both have common insulting nicknames they call each other. Zoro never calls Sanji by his name, usually calling Sanji "dartboard brow", "ero-cook", or "dumbass cook" while Sanji often calls Zoro "marimo" (mosshead), "shitty marimo", or "shitty swordsman". This has gotten to the point where Zoro has never actually referred to Sanji by his name.[32] After their return to Sabaody Archipelago after training for two years, Zoro mocked Sanji arriving later to him by referring to him as "Number 7" and himself as "Number 1". Despite their comical fights and rivalry, they have an unspoken trust and care between them they would never admit to. In fact, the two warriors understand each other better than other crewmates. Zoro's trust in Sanji's strength and character can be seen multiple times.

Zoro is a muscular young man of medium height with slightly tanned skin. He always carries his three swords with him, wrapped with a green haramaki on his right hip, allowing him to draw them easily with his left hand. Of the three swords he owns, he has always been seen carrying the Wado Ichimonji, while his other two swords have varied over time due to them being destroyed and replaced by progressively better ones. Although his right hand is usually seen over them, he can also use this hand to draw his swords before sitting down. He has three identical gold earrings in his left earlobe. Zoro usually keeps a black bandana tied around his left bicep and ties it around his head when he is seriously fighting an opponent.

Zoro's body is covered in scars from his many battles, most notably the huge scar that stretches from his left shoulder to his right hip, acquired during his defeat by the world's greatest swordsman, Dracule Mihawk, at Baratie. His other visible scars are the scars he inflicted on his ankles in a desperate attempt to free himself from Mr. 3's Giant Candle Service by trying to timeskip his feet in Little Garden. After the timeskip, he gained another scar over his left eye, obtained through unknown means.

Zoro's other notable feature is his cropped green hair, which Sanji often teases him about by calling "marimo" due to his resemblance to one. Before and after the timeskip, Zoro's hair had a shade close to aqua green.

Zoro usually maintains a very stern, serious, and distanced personality, but often loses his temper in a goofy and exaggerated comical style. It would seem however, that this anger is the only emotion that Zoro often feels comfortable showing. Outside of situations where he feels confident in battle, he tends to smile or laugh the least out of the Straw Hats and rarely fools around with the rest of the crew and likes to distance himself more to sleep or train. In fact, his defeat at the hands of Dracule Mihawk and subsequent vow to Monkey D. Luffy is the only time since his friend Shimotsuki Kuina passed that Zoro has been seen crying in the series.

Even in moments that are particularly tough on the crew and would warrant sadness, Zoro chooses to maintain a quiet solemnity rather than outwardly express his emotions. He has been shown to believe to a degree that these emotions can hinder his judgement as a swordsman: when Ohm asked him if he was out for revenge upon discovering Tony Tony Chopper wounded and unconscious, he replied that he does not like to fight for reasons like that. Despite this assertion, though, he cares deeply for his crewmates and wishes to protect them at all costs, telling Ohm that in spite of his preference for fighting without a motivation he can feel one coming on.

Despite his angry and rather cold personality, as well as his fearsome reputation, Zoro has a very kind heart, as he was willing to risk his life for the sake of a little girl he did not know shortly after his introduction.

Zoro is also easily really sensitive when put into embarrassing situations to where he prefers to object vocally while usually blushing from embarassement, rather than respond violently like Nami or Sanji.

He also seems to be partially irreverent, but not seriously so, simply choosing to focus more on his training and what is clearly in front of him than worry about spiritual matters as well as questions about its mysteries that he cannot truly answer.

Like Luffy, Zoro shows little interest or attraction to women (cause he's gay). He was not enticed or won over by the beauty or charms of Nami or Robin when they joined.

He is also very loyal as he will stand by Luffy's decisions regardless of whether he personally agrees or not, stepping in only to point out the seriousness of a situation where it has been overlooked by his crewmates, most notably when they wanted to bring Usopp back into the crew after Usopp challenged Luffy to a duel over the Going Merry and lost, even willing to quit the crew himself if Luffy just brushed the incident off and treated it as another joke because it betrayed his strong values in loyalty.

While the crew sails from one island to another, he normally spends time lifting weights, practicing meditation or napping, only to be regularly awakened in a rather violent way by Nami, Sanji, or (accidentally) Luffy. While in his spare time, Zoro takes up hobbies such as fishing, drinking, and training.

Zoro has devoted his life to becoming the world's strongest swordsman. Even before joining the crew, he was well-renowned for his outstanding abilities and accomplishments in battle. His skills drastically improved after becoming the combatant of the Straw Hat Pirates and entering a two-year training period under the "Strongest Swordsman in the World", Dracule Mihawk.

By the time he met Luffy, Zoro had established himself as a fearsome bounty hunter in the East Blue, so much so that Koby had heard he was a "demon in the form of a man". His accomplishments in hunting pirates were significant enough to earn him the epithet of "Pirate Hunter", which he remains known for even after becoming a pirate. After his crushing loss to Dracule Mihawk, he vowed never to lose again. Since joining the crew, Zoro has defeated several mighty adversaries (most of whom are fellow swordsmen).

Alongside Luffy and Sanji, Zoro is considered one of the Monster Trio (怪物三人組, Kaibutsu San-ningumi?) of the Straw Hats due to his strength. In some instances, he has even been mistaken as the leader of the Straw Hats due to his more extensive reputation; onlookers have also wondered how he could not be the captain after seeing demonstrations of his power. During the crew's journey, Zoro has come to possess some of the most legendary swords in history and has used them to both improve his skills and develop the most devastating attacks.

Zoro was the second Straw Hat to receive a bounty, and for much of the crew's existence, his bounty has been the second highest. Zoro was identified as a Super Rookie after obtaining a bounty of Beli 120,000,000 before reaching the Sabaody Archipelago; he was only one of two non-pirate captains (alongside Killer) of the "Worst Generation" to have that distinction.

Weaker people are easily intimidated by Zoro, as Koby remarked that he had a "demonic aura" at Shells Town even as he was tied up and starved of food for over a week.

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