This post is the theory that expand on the concept that I read from this post (link below) and some random stuffs I read:
https://worstgen.alwaysdata.net/for...it-soul.56100/#lg=_xfUid-9-1714810189&slide=0
I believe the concept of life made up of mind, body, and soul is the important building block in one piece world.
Everything has a soul
Every living being and inanimate object actually has a soul. Like human and all living things, inanimate objects like ship, sword, poneglyph also possesses a soul of their own. This is how Vegapunk is able to feed a devil fruit into spandam's sword because it has a soul to be fused together. However, inanimate objects don't have a mind like living beings do. But people can make them come to live with their strong desire.
Love
Yes the power to make things come to live is love. In Water Seven, Strawhat's ship Going Merry had sailed for sometime felt the love of the crew and Usopp's always repair the ship back no matter how broken it is. This ignites a strong mind inside the ship, thus giving it a will of it's own.
Haki
Haki is actually the power of soul, how strong a person's haki can get depends on how strong their soul can go. CoA is a combination of soul and body, that is why it is trainable and also explain why haki appears to be black colour because it is the colour of soul. ACoA requires power of mind to listen to object and exert the power of soul into the object and break it with desire. CoC is not trainable because it solely depends the soul, the stronger the soul the stronger the CoC.
Voice Of All Thing
I think some people can listen to object stronger than others. Like how Zoro can listen to the heatbeat of the stone when fighting Dazbone, but Roger can listen to the voice of the object. Like I said before, breaking something with just haki requires the power to listen to the object.
Black Blade
The two black blades we have seen are Ryuma's Shusui and Mihawk's Yoru. Why the color is black, yes it's the colour of soul. It could have different colours but what I think when it reinforces something physically, it just turns black colour. To achieve black blade, first is to love the sword, ignite the mind of the sword, giving it a will of it's own. Then the sword will give the wielder a series of test, if all of them passed. Together with the love and haki of the owner given to the sword, the soul and mind of the sword become so strong to a point it becomes a black blade. Zoro and Shiryu will turn their sword into black blades because we have seen many times Zoro really cared about his sword and Shiryu greet his sword like a person after released from prison cell. Gorosei Nasjuro doesn't have a black blade because he is something of a hatred himself.
Sandai Kitetsu previous owners possibly loved the sword so much that given it a mind. It could easily cut Zoro left arm but decided to spare him, it was not luck. Oden's sword Emma also has it's own mind which we have seen him as a form of reaper after beating King, it wanted to kill Zoro maybe because Zoro is drained of haki but decided to spare Zoro's life. Not sure why is it, could be his left eye or something.
Early on Egghead, Zoro said he wanted to ask Vegapunk something, it could be related to the reaper he saw. But Vegapunk's physical body is destroyed and he won't be getting his answer. He have to search it himself, this probably a foreshadowing Zoro will get a black blade when fighting Gorosei.
Gorosei
Hot take here, I think Gorosei is a form of soul and mind (spirit) without a physical body. Their were brought to the One Piece world with black magic that made their spirit interactable to the world. When Gorosei entered Egghead through the magic circle, it comes out as a black thing, that is probably his soul. So Gorosei is just a physically interactable haki. They were dead a long time ago, or they were ageless and their physical body were kept in the freezer in Mariejois.
The Ancient Iron Giant
You probably know what I am going to say, it just similar scenario like Going Merry. The Iron Giant probably made a promise to protect Poseidon 800 years ago to Joyboy. It was 200 years ago Fishman attended their previous reverie, the same time where Iron Giant attack Mariejois. His sudden ignition of mind is because of Poseidon being hurt. Shirahoshi accident during the reverie is the parallel of what happened 200 years ago. Maybe it was too late for the Iron Giant to save her that her death lead to the Iron Giant losing it's mind, thus it's power.
Eternal Flame
I think what Vegapunk found out from Kuma is the power source he is seeking, it's not the body, but mind and love. Even though Kuma's mind has been erased by Vegapunk, but Bonney's love for Kuma ignites the mind of Kuma. It's similar to the Ancient Giant and Poseidon story. Love is the eternal power source and it gives living being and inanimate object a complete life. As long as there are love received, the object will not stop working. I guess this is what happened to Uranus, it runs out of power because the person loves it died and there is no reason to work anymore.
Love vs Hate
Strawhat pirates vs Blackbeard pirates. Strawhat crew represents the love to the world, they are on the mission to save it. Whereas, Blackbeard crew represents the hatred towards the world and on the mission to destroy it.
Left side scars vs right side scars
Oda has specifically drawn scars in a way that only appears on right or left or maybe both. I found the reason why it is. The left scars are actually means people who love the world, and the right scars is the opposite which is hatred towards to world.
Some strawhat crews had some form of scars on the left side, or injured on the left side and healed. Coincidentally, some Blackbeard crews has some form of scars/injuries/cosmetics on the right side. The only person different from the rest of blackbeard crews is Kuzan that has a burnt scars on the right shouder and a decapitated left leg because he used to love the world, but now he hates it. This isn't just apply to Strawhats and Blackbeards, it can apply to other characters as well. Now looking at Akainu's right side scars, Blackarm Zephyr decapitated right arm, the list goes on.
Kaido Good Oni?
Notice how Luffy's attacks somehow land on Kaido's left side, and the final attack landed on the left side. This is probably a foreshadow of Kaido becoming a good Oni. In the cover story, we will probably see Yamato reconcile with his father Kaido, it's a parallel of Oden reconciled with his father.
https://worstgen.alwaysdata.net/for...it-soul.56100/#lg=_xfUid-9-1714810189&slide=0
I believe the concept of life made up of mind, body, and soul is the important building block in one piece world.
Everything has a soul
Every living being and inanimate object actually has a soul. Like human and all living things, inanimate objects like ship, sword, poneglyph also possesses a soul of their own. This is how Vegapunk is able to feed a devil fruit into spandam's sword because it has a soul to be fused together. However, inanimate objects don't have a mind like living beings do. But people can make them come to live with their strong desire.
Love
Yes the power to make things come to live is love. In Water Seven, Strawhat's ship Going Merry had sailed for sometime felt the love of the crew and Usopp's always repair the ship back no matter how broken it is. This ignites a strong mind inside the ship, thus giving it a will of it's own.
Haki
Haki is actually the power of soul, how strong a person's haki can get depends on how strong their soul can go. CoA is a combination of soul and body, that is why it is trainable and also explain why haki appears to be black colour because it is the colour of soul. ACoA requires power of mind to listen to object and exert the power of soul into the object and break it with desire. CoC is not trainable because it solely depends the soul, the stronger the soul the stronger the CoC.
Voice Of All Thing
I think some people can listen to object stronger than others. Like how Zoro can listen to the heatbeat of the stone when fighting Dazbone, but Roger can listen to the voice of the object. Like I said before, breaking something with just haki requires the power to listen to the object.
Black Blade
The two black blades we have seen are Ryuma's Shusui and Mihawk's Yoru. Why the color is black, yes it's the colour of soul. It could have different colours but what I think when it reinforces something physically, it just turns black colour. To achieve black blade, first is to love the sword, ignite the mind of the sword, giving it a will of it's own. Then the sword will give the wielder a series of test, if all of them passed. Together with the love and haki of the owner given to the sword, the soul and mind of the sword become so strong to a point it becomes a black blade. Zoro and Shiryu will turn their sword into black blades because we have seen many times Zoro really cared about his sword and Shiryu greet his sword like a person after released from prison cell. Gorosei Nasjuro doesn't have a black blade because he is something of a hatred himself.
Sandai Kitetsu previous owners possibly loved the sword so much that given it a mind. It could easily cut Zoro left arm but decided to spare him, it was not luck. Oden's sword Emma also has it's own mind which we have seen him as a form of reaper after beating King, it wanted to kill Zoro maybe because Zoro is drained of haki but decided to spare Zoro's life. Not sure why is it, could be his left eye or something.
Early on Egghead, Zoro said he wanted to ask Vegapunk something, it could be related to the reaper he saw. But Vegapunk's physical body is destroyed and he won't be getting his answer. He have to search it himself, this probably a foreshadowing Zoro will get a black blade when fighting Gorosei.
Gorosei
Hot take here, I think Gorosei is a form of soul and mind (spirit) without a physical body. Their were brought to the One Piece world with black magic that made their spirit interactable to the world. When Gorosei entered Egghead through the magic circle, it comes out as a black thing, that is probably his soul. So Gorosei is just a physically interactable haki. They were dead a long time ago, or they were ageless and their physical body were kept in the freezer in Mariejois.
The Ancient Iron Giant
You probably know what I am going to say, it just similar scenario like Going Merry. The Iron Giant probably made a promise to protect Poseidon 800 years ago to Joyboy. It was 200 years ago Fishman attended their previous reverie, the same time where Iron Giant attack Mariejois. His sudden ignition of mind is because of Poseidon being hurt. Shirahoshi accident during the reverie is the parallel of what happened 200 years ago. Maybe it was too late for the Iron Giant to save her that her death lead to the Iron Giant losing it's mind, thus it's power.
Eternal Flame
I think what Vegapunk found out from Kuma is the power source he is seeking, it's not the body, but mind and love. Even though Kuma's mind has been erased by Vegapunk, but Bonney's love for Kuma ignites the mind of Kuma. It's similar to the Ancient Giant and Poseidon story. Love is the eternal power source and it gives living being and inanimate object a complete life. As long as there are love received, the object will not stop working. I guess this is what happened to Uranus, it runs out of power because the person loves it died and there is no reason to work anymore.
Love vs Hate
Strawhat pirates vs Blackbeard pirates. Strawhat crew represents the love to the world, they are on the mission to save it. Whereas, Blackbeard crew represents the hatred towards the world and on the mission to destroy it.
Left side scars vs right side scars
Oda has specifically drawn scars in a way that only appears on right or left or maybe both. I found the reason why it is. The left scars are actually means people who love the world, and the right scars is the opposite which is hatred towards to world.
Some strawhat crews had some form of scars on the left side, or injured on the left side and healed. Coincidentally, some Blackbeard crews has some form of scars/injuries/cosmetics on the right side. The only person different from the rest of blackbeard crews is Kuzan that has a burnt scars on the right shouder and a decapitated left leg because he used to love the world, but now he hates it. This isn't just apply to Strawhats and Blackbeards, it can apply to other characters as well. Now looking at Akainu's right side scars, Blackarm Zephyr decapitated right arm, the list goes on.
Kaido Good Oni?
Notice how Luffy's attacks somehow land on Kaido's left side, and the final attack landed on the left side. This is probably a foreshadow of Kaido becoming a good Oni. In the cover story, we will probably see Yamato reconcile with his father Kaido, it's a parallel of Oden reconciled with his father.
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