According to a widely accepted fan theory, Zoro has Conqueror's Haki and uses his left eye to activate it. Oda has emphasized the user's eyes, in contrast to Conqueror's Haki, which adds some weight to this theory.
A very popular idea suggests that opening this eye would lead to Zoro unleashing the full power of the demon that is within him. Zoro has often been compared to demons by many characters in the story, such as Kaku, during their fight in Enies Lobby.
Prior to One Piece's timeskip, Zoro's left eye was fully functioning and completely uninjured. Yet when the Straw Hats reunited after their respective adventures, Zoro's left eye was mysteriously scarred shut. Prior to the timeskip, his left eye had been seen glowing when using certain attacks.
Why isn't Zoro opening his left eye in One Piece? Several theories exist. The most intuitive one is simply that he got hurt during his training with Mihawk somehow. This makes sense given what we know of Mihawk's tough training style and his immense power and Zoro's stubbornness.
Zoro wanted to see if he was worthy of Mihawks little knife necklace thing so he threw it it the air (like his cursed sword) and it slashed his eye which meant he still wasn't worthy to wield that knife.
It limits his sight and his depth perception in particular, and it would get hair in his open eye whenever the wind blows. You could say its because he's ashamed of his relation to Germa, but if he really cared that much, he would have just shaved the twirly bits off both his eyebrows, like he recommended Duval do.
Zoro has ocular dominance. His left eye is his strong eye. He does not have 20-20 vision. In his fight with Mihawk, Mihawk realized that some of Zoro's positioning, depth perception, and reflexes were affected by the fact that his right eye was so much weaker than his left.
Regardless of how much stronger he was compared to the vast majority of the people he knew, deep down, he was aware of just far the gap was between him and his ultimate goal. This humbling affected Zoro on a deep level, so much so that it seems to have caused him to become much more serious.
Sandai kitetsu is most regarded for its great sharpness, making it far easier for slicing things, as highlighted when Zoro decided to test his luck against its curse, with its previous owner, Ipponmatsu declared it could cut off his arm.
Zoro was the first person who accepted Luffy's invitation and joined the latter on his journey to become the Pirate King. Zoro is a very powerful fighter and he possesses all three types of Haki. Zoro was able to use Conqueror's Haki unknowingly against Kaido.
As Shanks has given his arm to Luffy for the new generation, Mihawk has given his eye to Zoro. Because he has the sharingan. Kidding, After the two-year timeskip, Zoro gains a new scar running down his left eye, which is now implied to be critically injured as it is always closed.
It's entirely possible Mihawk noticed through their duel and training that Zoro suffers from ocular dominance in his left eye. That is to say, the left eye is stronger than the right. As a result, maybe Mihawk scarred the left eye shut and instructed Zoro not to open it until his right eye was trained enough.
After the two-year timeskip, Sanji now covers his right eye, shows his left eye, and has grown his hair just slightly longer.
During his time on Momoiro Island, Sanji learns a move named “Sky Walk,” which allows him to jump to great heights and to be able to float mid air by making sonic booms in the air behind him.
Sanji was born in the North Blue into the Vinsmoke Family, the reigning royal family of the Germa Kingdom, along with his three brothers on the same day, with Sanji being the third son of the family, thereby making him the kingdom's third prince.
He was taught to fight by red leg (his adopted father and mentor) so he is only fighting like he knows how… Think about it, if you were trained as a boxer, would it make sense if you started using kicks like a karate master or finger locks like a kung fu master? A boxer would not know how to do any of that.
Enma is the strongest sword possessed by Zoro of the Straw Hat Pirates right now. What is Zoro's weakest sword? Sandai Kitetsu has to be the weakest sword Zoro has used until now in the One Piece manga and anime.
Over the years, he has come a long way and become one of the strongest pirates on the seas. Zoro has attained terrific strength, but he does not rely on a Devil Fruit at all.
9 Won't Eat: Roronoa Zoro
Wielding three swords, Zoro possesses immense proficiency in this art and, over the course of time, his Haki has been consistently improving as well. For someone like Zoro, eating a Devil Fruit doesn't make much sense because he doesn't need to depend on one.
The reason is because Zoro understands exactly what Luffy means just by a look or by even Luffy calling his name. Luffy goes to Zoro the most out of anyone on the ship even for the smallest of things. He has proven to understand Luffy the first time when they met each other.
During this arc, Zoro and Luffy, having lost their memories, confront each other and engage in a fight. It is during this fight that Zoro lands a strong surprise attack on Luffy, slicing his chest and thus giving him the X-shaped scar.
Zoro usually carries three swords with him to perform the three-sword style anytime. So currently, he has the Wado Ichimonji, Kitetsu III, and Enma with him. What is Zoro's weakest sword? Out of the swords he currently owns, the Sandai Kitetsu is the weakest blade in his arsenal.