Summary
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Zoro's extreme loyalty to Luffy is demonstrated through sacrifice and heroism.
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Fans speculate that Zoro would do anything Luffy ordered, even kill a fellow crew member.
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Zoro is more than a mindless tool; he cares about the crew and would question Luffy's orders.
Zoro the swordsman of One Piece The Straw Hat crew are incredibly loyal to their captain, Luffy. This characteristic of the swordsman is one of his main and most interesting qualities. Often, the burly swordsman will sacrifice everything to help Luffy in his goal of becoming the Pirate King of One pieceeven going so far as to promise to never lose another fight to see him succeed.
However, even though Zoro is fiercely loyal, some fans have gotten the wrong idea about his character. Some fans believe that Zoro's loyalty to Luffy makes him a mindless tool who will do whatever his captain says. This includes some fans who believe that the swordsman would kill another member of the Straw Hat crew if Luffy gave the order. While it's true that Zoro would do most things for Luffy, killing a longtime ally and friend is not one of them.

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Zoro is extremely loyal to Luffy throughout One Piece
Because of this, fans speculate that they would do whatever Luffy says
Throughout the series, Zoro has frequently shown his loyalty to Luffy through great acts of heroism and sacrifice. First, after losing of One Piece strongest swordsman, Dracula Mihawk, Zoro declares that he will never lose again to help Luffy become the Pirate King. From here, Zoro endured immense pain for Luffy, including the incredible moment in Thriller Bark where Zoro chose to suffer all of Luffy's pain and exhaustion on behalf of his captain.
Nothing happened… – Zoro after taking Luffy's pain on Thriller Bark
This extremely loyal brand from One piece the swordsman spawned a rumor in the community that Zoro, if ordered by Luffy, would kill any member of the Straw Hat crew without hesitation. Some fans even claimed that Oda said this himself, although there was no evidence to support these claims. However, posts claiming that the swordsman would kill another crew member are making the rounds frequently One piece communities on Social Media.
Zoro wouldn't kill another straw hat if Luffy asked him
The swordsman is more than a mindless tool
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Zoro cares about his crew despite not expressing it
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Zoro follows Luffy because he is a moral and strong leader
First, while Zoro is an incredibly dedicated crew member, he's more than a mindless tool to the protagonist One piece, Luffy, to order around. Zoro loves being part of the Straw Hat crew and regards them as family as much as any of the other crew members. Although a bit intense, especially after the passage of time, he would most likely question his captain's decision in the first place. In fact, it seems much more likely that Zoro would fight Luffy in this situation, wondering why he would give this kind of order in the first place.

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Then, although Zoro was confirmed to have killed a character before the events of One piecehe is far from a criminal. Although he appears to attack his enemies with lethal force, none of them die from his blows. Whether this is due to Zoro holding back on his final blow to avoid killing his enemies or the fact that One piece is a series for all ages to enjoy, killing a straw hat in Luffy's name seems incredibly impersonal for Zoro.
There may be a rare scenario where Zoro would fight another Straw Hat
Although he still wouldn't try to kill them
Although it seems unlikely that Zoro will ever kill another Straw Hat One piecethere may be some specific but rare scenarios where the powerful swordsman Zoro may be forced to use lethal force on a fellow crew member. Mainly, if one of the Straw Hats betrayed and killed another crew member first, it looks like Zoro would try to hunt them down for punishment. However, even in this hypothetical scenario, it would be against Zoro's character to kill even a friend who betrayed him.
I swear I will never lose again! Got a problem with that, Pirate King? – Zoro
With all that said, Zoro would act alone in this situation and wouldn't need an order from Luffy to get his revenge. In the end, Zoro will never kill another One piece A member of the Straw Hat crew if Luffy ordered him to, as this is incredibly impersonal for the swordsman. While Zoro is loyal, he is not a mindless drone who follows Luffy's every whim. He's a completely concrete character with his own moral code to stick to. So far in One piecemore often than not, this moral code aligns perfectly with Luffy's.
