Roronoa Zoro

Roronoa Zoro, also known as "Pirate Hunter" Zoro, is a swordsman and combatant of the Straw Hat Pirates and a former bounty hunter. He was the first member to join the crew, and is considered one of the Monster Trio alongside Luffy and Sanji. His fame as a master swordsman and his great strength, along with the actions of his captain, sometimes led others to believe he was the true captain of the crew before he obtained his first bounty. His dream is to become the greatest swordsman in the world. Zoro is also regarded as one of twelve pirates who are referred to as the "Worst Generation". He currently has a bounty of Beli320,000,000, which is the 4th highest in the crew, after Luffy, Jinbe, and Sanji. Zoro is an extremely powerful and strong-willed fighter with immense potential. He is one of the crew's top four strongest fighters along with Luffy, Sanji, and Jinbe and currently has the fourth highest bounty in the crew. He is a monstrously powerful swordsman who does not posses a Devil Fruit, instead using a unique sword style of his own creation in battle, known as Santoryu wielding a sword in each hand along with one in the mouth.

When taking his stern personality into account, others mistake him as the captain of the Straw Hats after witnessing his skills in battle on some occasions. Also during the heat of battle, he has been known to give off the aura of a "demon" which often intimidates weaker opponents. Despite a near constant rivalry with fellow Straw Hat Sanji, the two have proven to be a near-unstoppable force when working together, as exemplified in the fight against the Groggy Monsters. Alongside Luffy and Sanji, Zoro is considered one of the Monster Trio due to his strength. Through years of extremely rigorous training since childhood, which consist mainly of grueling body building exercises in addition to hard training in swordsmanship, Zoro has immense physical prowess, particularly his strength, agility, and endurance. After two years of intense training with Dracule Mihawk, Zoro has grown significantly more powerful. As demonstrated during his first appearance after the timeskip, Zoro can even cut through a large ship with ease, speed, and precision (also considering without the use of his left eye). Zoro was even able to cut a Pacifista in half with just one slash from his swords. Two years prior, he barely managed to slightly damage one.

Zoro's newly-found strength is further demonstrated when he averts the previously mentioned formula of fighting the arc's second strongest foe when he easily defeats Hody Jones, a powerful fish-man and captain of the New Fish-Man Pirates. He accomplishes this with just a single strike from the Sandai Kitetsu, despite being at a disadvantage fighting a fish-man underwater. Through his training, Zoro has grown strong enough to effortlessly defeat Logia users with inferior fighting skill, as he demonstrated to Monet by cutting her vertically in half without Haki. Outside of battles, Zoro has one obvious weakness: his complete lack of orientation. He often demonstrates that he can easily get lost everywhere and always walks in the wrong direction. He even sometimes walks the wrong way when having his target in plain sight, looking for shortcuts. Zoro can also get confused by his own directions, such as in the Skypiea Arc when he intended to go right, but instead went to his left. Also, In Enies Lobby, Nami pointed towards a flight of stairs and told everyone to run to the roof of a building, but Zoro dashed away as if looking for some other way to the top of a building. He has also gotten lost running through a straight corridor. In Dressrosa, his lack of orientation gave the dwarf Wicca a terrible time while she desperately tried to lead Zoro in the right direction only to have him consistently run in a completely wrong direction even when Wicca pointed towards the right place to go.

Zoro is an extremely powerful Strong Blade type master swordsman, being able to use one, two, and three swords in varying attack styles, going from melee-type all the way to long-range sword strikes. He is even able to use Flying Slashes, a high-level sword technique that utilizes the very air pressure of sword swings itself to strike the enemy from a distance. Zoro can also carefully time his sword strikes to counter or deflect extremely powerful attacks such as Kaku's Rankyaku. As noted by Brook, Zoro is a user of Power of Destruction, a concept to describe a swordsman with immense physical strength. While disguised as a ronin in Wano Country, Zoro used a short Tanto to perform a powerful flying slash that cut down a magistrate along with the building despite the short range of the blade, a further testament of his improved skills in swordsmanship. Additionally, after having Shusui taken from him and during his fight against the assassin Kamazo, Zoro was able to not only take the scythe from the assassin after being stabbed in the shoulder but use it as an improvised blade to perform his Santoryu, which is another testament to his improved swordsmanship. Since no one else has been seen using anything similar to his Santoryu style (except for Jigoro while he possessed Zoro's shadow), it can be assumed that Zoro invented not only Santoryu but most, if not all, of his sword techniques. He is even seen perfecting a new technique in his fight with Braham. During his battle against Kaku, Zoro manages to awaken a new sword style known as "Kyutoryu", which gives him the appearance of having six arms and three heads, like the deity Asura, when activating the technique Kiki Kyutoryu: Asura. He also becomes surrounded by a dark aura while in this state, and the first time he achieved it, the ground shook and numerous holes appeared in it. This ability also allows Zoro to utilize nine swords in combat to effectively triple his potential as a swordsman, and it is usually used as an extremely powerful finishing move. Kaku noted it as a tangible spiritual aura created by Zoro's spirit through intense spiritual focus, which was able to inflict immense physical damage. It was stated by Luffy that Zoro possesses Haki, when discussing it in the context of members of his crew who could fight Caesar Clown, a Logia user. Because Law was referring to the ability to coat themselves in armor it confirms Zoro as a Busoshoku Haki user. Prior to the Sabaody Archipelago Arc Zoro was never aware of Haoshoku Haki, something he (along with the rest of the crew) had not shown any knowledge of during the first half of the series. However he, along with Sanji, has commented on Luffy's ability to passively knock out half of Hody's men, stating that if Luffy could not at least do that much then he would have had to have stepped down from being captain. Zoro knows how to use Kenbunshoku Haki, as shown when he was asked by Luffy if he could sense a "wild animal" in the Ryugu Palace, he stated that he could. In the anime, Zoro was shown using Kenbunshoku Haki to locate Pica during the Dressrosa Arc. Zoro also detected Batman attempting to kill Tsuru with an arrow fired from a far distance in the air. Bushosoku Haki is his specialty concerning Haki, which Zoro learned from Mihawk during the two-year timeskip. He first demonstrated Busoshoku Haki while against fighting Monet, a Logia user, on Punk Hazard after he slashed her cheek with a flying slash to save Tashigi. During his fight with Pica it was first demonstrated he could imbue Busoshoku Haki into all three of his swords (Wado Ichimonji, Sandai Kitetsu, and Shusui) at once and hardening them; in doing so he managed to bisect Pica as a stone giant; Zoro later cut him down after he covered his entire body with the same Haki, thereby also demonstrating his supreme mastery over Haki as compared to the Donquixote top executive. In One Piece Film: Gold, Zoro was able to reinforce his arms with Haki to successfully defend simultaneous slashes from both his swords Sandai Kitetsu and Shusui without getting injured at all.