Good evening to everybody, I write a theory of mine on black blades.
As Mihawk said all blade can be turned into Kokuto (black blades)
At the start we tought it meant only armament haki imbued sword, and it still has that meaning, but we learnt in wano the truth about Shusui black nature, it was forged in to a kokuto trough Ryuma's battle.
Now, let's focus also on the second part of Gyukimaru's dialogue. "Are you but some greedy boy with little taught aside from you own base desire?"
The underline part is very important. It tells us the meaning behind the black blades and how they're achieved. We got a lot hints throughout the story that meitos have somekind of their own will, and later fight between King and Zoro, the Kozaburo's flashback basically confirmed.
Meitos have their own will.
My guess is to achieve a Black Blade a swordsman must first tame the sword itself and merge with sword's will fulfill their purpose too. That it is Zoro has to think about, have to realise, as Gyukimaru said, "aside from his own base desire".
Whatever was Shusui desire and will it was related to wano, like it how it's the national treasure of the country and taking it away brough missfortune to the land, and Shusui is such important blade to wano that Hiyori gave away her own death father inheritance in exchange of that.
This would give an explanation on why poeple like Roger, Shanks, Whitebeard haven't made their blade black. It's not only about strengh and Haki.
I also think that meito inherites part of their previous long owner and companion's will, as it was stated by Kawamatsu.
Now let's discuss about Zoro's set of blades:
-WADO The most obvious one is Wado. It was Kuina's blade and the blade of the promise. Its purpose is being the strongest in world and is tied to Zoro's dream. Wado will turn black when Zoro will fulfill his dream and become the strongest swordman in the world, I see it Zoro concluding his victory by turning it black right in the moment of the winning attack.
-ENMA It's the sword of the moment, it being turn black is something that is set to happen, Tenguyama foreshadowed it. What's enma's desire? First thing is to think about Oden as said before on blades inheriting past companions' will. For Enma is made basically blatant by Kaidou, who said it has Oden's presence in it. Enma is tied to Kaidou and the opening of the boarders of Wano country. Whether is to kill Kaidou or not is not relevant for the topic, but I can see it turning black by killing Kaidou, but anyway it has to contribute in very important and active way in fulfilling the opening of wano country. It's not a crazy hypothesis to think Oden could have turned it Black 20 years ago had him defeated Kaidou, so Zoro will still do something major and very important against Kaidou whather if it's to set up Kaidou for Luffy or straigh killing him.
Zoro is not done, he still have a very important plot line to complete and it's the Ryuma-Shimotsuki storyline that Oda started since act 1 of wano, and aproched it again in chapter 1023
He still have to save the flower capital from Kaidou and get recognized by the civilian of wano as a new ryuma like figure.
We also now know Luffy is related to Nika the Sun God, we can track a huge parallel with Zoro being the Moon. Shimotsuki means both Ice moon and first moon, and guess who's heavily related to the shimotsukis?
In Kuina's flashback the Moon is emphaticized many times.
The Sun and Moon are also very promiment in Binks no Sake which we all know now has a huge meaning in this arc.
Also Luffy's and Zoro's power ups in this arc have being paralled:
1) Armament Haki training
2) Conqueors Haki coating
3) Now Luffy got his DF awakening, Zoro will also awaken his blade by turning it black.
Also the thematic of Fate that brough both of them to Wano is paralleled, also Zoro will still have an important role to play.
As for Sandai Kitetsu I really have no clue about it. Maybe you guys have something to say about it.
As Mihawk said all blade can be turned into Kokuto (black blades)
At the start we tought it meant only armament haki imbued sword, and it still has that meaning, but we learnt in wano the truth about Shusui black nature, it was forged in to a kokuto trough Ryuma's battle.
Now, let's focus also on the second part of Gyukimaru's dialogue. "Are you but some greedy boy with little taught aside from you own base desire?"
The underline part is very important. It tells us the meaning behind the black blades and how they're achieved. We got a lot hints throughout the story that meitos have somekind of their own will, and later fight between King and Zoro, the Kozaburo's flashback basically confirmed.
Meitos have their own will.
My guess is to achieve a Black Blade a swordsman must first tame the sword itself and merge with sword's will fulfill their purpose too. That it is Zoro has to think about, have to realise, as Gyukimaru said, "aside from his own base desire".
Whatever was Shusui desire and will it was related to wano, like it how it's the national treasure of the country and taking it away brough missfortune to the land, and Shusui is such important blade to wano that Hiyori gave away her own death father inheritance in exchange of that.
This would give an explanation on why poeple like Roger, Shanks, Whitebeard haven't made their blade black. It's not only about strengh and Haki.
I also think that meito inherites part of their previous long owner and companion's will, as it was stated by Kawamatsu.
Now let's discuss about Zoro's set of blades:
-WADO The most obvious one is Wado. It was Kuina's blade and the blade of the promise. Its purpose is being the strongest in world and is tied to Zoro's dream. Wado will turn black when Zoro will fulfill his dream and become the strongest swordman in the world, I see it Zoro concluding his victory by turning it black right in the moment of the winning attack.
-ENMA It's the sword of the moment, it being turn black is something that is set to happen, Tenguyama foreshadowed it. What's enma's desire? First thing is to think about Oden as said before on blades inheriting past companions' will. For Enma is made basically blatant by Kaidou, who said it has Oden's presence in it. Enma is tied to Kaidou and the opening of the boarders of Wano country. Whether is to kill Kaidou or not is not relevant for the topic, but I can see it turning black by killing Kaidou, but anyway it has to contribute in very important and active way in fulfilling the opening of wano country. It's not a crazy hypothesis to think Oden could have turned it Black 20 years ago had him defeated Kaidou, so Zoro will still do something major and very important against Kaidou whather if it's to set up Kaidou for Luffy or straigh killing him.
Zoro is not done, he still have a very important plot line to complete and it's the Ryuma-Shimotsuki storyline that Oda started since act 1 of wano, and aproched it again in chapter 1023
He still have to save the flower capital from Kaidou and get recognized by the civilian of wano as a new ryuma like figure.
We also now know Luffy is related to Nika the Sun God, we can track a huge parallel with Zoro being the Moon. Shimotsuki means both Ice moon and first moon, and guess who's heavily related to the shimotsukis?
In Kuina's flashback the Moon is emphaticized many times.
Also Luffy's and Zoro's power ups in this arc have being paralled:
1) Armament Haki training
2) Conqueors Haki coating
3) Now Luffy got his DF awakening, Zoro will also awaken his blade by turning it black.
Also the thematic of Fate that brough both of them to Wano is paralleled, also Zoro will still have an important role to play.
As for Sandai Kitetsu I really have no clue about it. Maybe you guys have something to say about it.