Why is Zoro's sword black?
For weapon users, their weapons become black as well. During a two-year time skip, Zoro trained under Mihawk to become stronger. Part of his training was to learn how to use Haki, and during this training, Mihawk told Zoro that with Haki, any blade can become a black blade like his.
Shusui is the black sword that Zoro inherited after defeating the zombified Ryuma in Thriller Bark. Although it's no longer in his possession, it is still one of the mightiest blades he possessed.
Then in chapter 937 Gyukimaru the guy who stole Shusui off Zoro claims that it grew to be a black blade over Ryuuma's many battles. These 2 pieces of information strongly suggest that Suisui wasn't always a black sword but turned into one due to prolonged use of haki.
When a blade is imbued with COA, it becomes black. However, a black blade is one that is permanently imbued with Haki, and remains black even when the owner isn't there or Haki isn't being channelled into it. There are only two black blades in the entire series: Shusui and Yoru.
After his defeat, Ryuma bequeathed the sword to Roronoa Zoro, and said he was satisfied with Zoro as the sword's master. The sword then replaced Zoro's Yubashiri which was destroyed by Marine Captain Shu at Enies Lobby.
3/14 Shusui, The Black Blade
Shusui is another legendary blade from Wano, which Zoro found during the Thriller Bark arc. It belonged to a spectacular swordsman called Shimotsuki Ryuma, and people revered it as a national treasure.
Concerning his ethnic appearance, Oda revealed that he imagines Zoro to be of Japanese descent, albeit in a real-world context.
In its initial depictions, in the A-ra-shi: Reborn video, its tsuka is black, and its hamon is golden. As seen in the opening "DREAMIN' ON", Enma's anime color scheme is a violet tsuka, as well as a violet sheath.
Either a) by the same logic Shusui is technically a grade weaker than Enma, Zoro would still have a weaker blade in Enma than Mihawk's Yoru and WB's Murakumogiri, both blackened Saijo O Wazamono swords, which should be stronger than blackening an O Wazamono sword like Enma.
Zoro would receive Shusui after battling and defeating the zombie of legendary Wano samurai, Shimotsuki Ryuma, on Thriller Bark. Shusui immediately replaced Yubashiri, and as one of the 21 Great Grade Meito swords, served as a considerable upgrade in both durability and strength.
Can buggy be cut with Haki?
Sword attacks with haki can hurt Buggy but can't bleed him as haki can't nullify DF power in which he can't be bleed.
The resulting jealousy eventually drove Masamune mad, resulting in him consuming souls to gain more power, which made his weapon form darker and darker until it became a pitch-black symbol of him trying to overcome his limitations.

Defeating the boss will drop two weapons, Gargoyle's Blackblade, which scales well with Dexterity, and the Gargoyle's Black Halberd, an amazing Strength. The boss is weak against Strike attacks. The boss is Immune to Scarlet Rot, Poison, Frostbite, and Hemorrhage.
Description. Sandai Kitetsu FOAM One Piece Anime Katana & Saya is carried by Roronoa Zoro (Burgundy Cursed Sword called Sandai Kitetsu) is an O Wazamono grade Katana known as the cursed sword for its reputation of cutting down it's own masters due to bad luck.
Although Zoro usually wields three swords as part of his style known as "Three Sword Style", he has shown himself to be an exceptional duelist and combatant while wielding two swords or even just one.
The Wado Ichimonji is a sword of great personal importance to Roronoa Zoro, and it once belonged to Kuina and her family. It is also one of the 21 Great Grade swords. After Kuina's death, Zoro asked for it from her father, who then gave the sword to him.
3/8 Roronoa Zoro, Wielder Of Enma (Potential)
This sword was then given to Roronoa Zoro in exchange for Shusui. While the sword is certainly not a Supreme Grade sword yet, it also hasn't blackened.
The wiki says the same thing: During and after the two-year timeskip, Zoro gains a new scar running down over his left eye, which is now implied to be critically injured as it is always closed.
Rumor has it that his cursed sword gainrd control over his body and zoro went berserk then mihawk cut his eye to inhibit the curse power... :) Just another way for oda to leave everybody guessing.
Yoru is one of the strongest swords in the world, ranked as one of the 12 Supreme Grade swords. It is a "Black Blade" (黒刀, Kokutō?) that is currently owned by Dracule Mihawk, the "Strongest Swordsman in the World".
What is Zoro's weakest sword?
Being of the lowest grade of the three swords, Sandai Kitetsu is the weakest of all the Kitetsu swords. Its name also indicates it was the last of the three to be made. The panel of Zoro keeping Sandai Kitetsu in the manga is extremely similar to that of Zoro keeping Enma.
Zorro's true identity is Don Diego Vega (later changed to Don Diego de la Vega), a young nobleman who lived in Los Angeles, California, during the early 19th century when the area was still under Spanish rule.
- 8/10 Usopp.
- 7/10 Jinbe.
- 6/10 Chopper.
- 5/10 Nami.
- 4/10 Brook.
- 3/10 Roronoa Zoro.
- 2/10 Monkey D. Luffy.
- 1/10 Sanji.
Luffy's real-world nationality analogue is Brazilian — Luffy is from the Goa Kingdom, named after an Indian city colonized by the Portuguese Empire. In the Netflix adaptation, Luffy will be portrayed by Iñaki Godoy, a Mexican actor.
Although Jack is durable, Zoro now has improved Haki and the power to cut through most objects with Enma. The sword had made him considerably stronger and in a fight against Jack, Zoro would definitely triumph with Enma in his possession.
Roronoa Zoro: XF. Nami: X. Usopp: S. Sanji: S (RH-)
The biggest pirate fleet in the East Blue was that of Pirate Admiral Don Krieg. The best rated swordsman in the East Blue was Roronoa Zoro.
The most mysterious sword color from Demon Slayer is the one Kanjiro wields. The black blade represents the Sun and is surrounded by prejudice and misconceptions, as historically every demon slayer who held it lived a short life.
Currently, Zoro is known to have owned seven swords, all of them katanas, and has briefly borrowed multiple other swords and weapons when necessary. Due to his Three Sword Style, he usually owns three swords at a time.
Zoro prefers to place Wado Ichimonji in his mouth when using his Three Sword Style, though prior to the timeskip, he uses it when using his One Sword Style in some battles. After the timeskip, he appears to favor Shusui when using his One Sword Style.
Is black Nichirin rare?
Tanjiro Kamado wields a black Nichirin blade, but the symbolism of such a sword is unknown. Black blades are seen as a rarity, as demon slayers who wield them are doomed to die young. No wielder of a black sword has ever become a Hashira, either.
It was after Daki unleashed an attack and harmed multiple people, Tanjiro was extremely angry at this that his eyes were turning blood-shot red.
The black color may be a testament to Tanjiro's incredible will, or it could be a sign that he is destined for greatness. Despite the significant personal meaning behind the color of Nichirin blades, they all are capable of killing demons so at least Tanjiro is not disadvantaged due to his sword's unusual shade.
Yoru is one of the strongest swords in the world, ranked as one of the 12 Supreme Grade swords. It is a "Black Blade" (黒刀, Kokutō?) that is currently owned by Dracule Mihawk, the "Strongest Swordsman in the World".
3/5 Wado Ichimonji
Wado Ichimonji is the first named sword that Roronoa Zoro carried in One Piece. It was forged by Shimotsuki Kozaburou, a person from Wano Country. This sword once belonged to Koushiro, the dojo master of Zoro from Shimotsuki village, and was meant to be inherited by Kuina, his daughter.
- 5/5 Sandai Kitetsu.
- 4/5 Yubashiri.
- 3/5 Wado Ichimonji.
- 2/5 Shusui.
- 1/5 Enma.
Because it's a national treasure stolen from Wano and the circumstances surrounding Zoro's fight with Ryuma are strange. Wano Country owned the sword after Ryuma's death.