We have heard that Oda has had the ending of OP decided upon from very early probably since the manga started. And we also have him saying that he creates stories for character designs and then just fits the characters into the story how he wants. This leads us to believe that there are some core characters that were designed and had a role set in the story from the beginning while there are others who just got shoved in the story because liked his own created design. We also know that characters that were not originally planned grew into more important role in the story. For example, the SNs are supposed to be a late edition, Kid was supposed to be one already planned but the rest were created later. Of all the SN we have had everybody play a role in the story to varying degrees of importance and Law has probably grown into one of the most central figures in the story from him randomly going to MF and saving Luffy to the whole Yonko saga. Bonney with the Nika shit seems to be relevant for times to come.
Then we also have things like Crocodile being introduced and defeated too early, the Warlords not being a thing from the start. And post Wano being called to where the real story starts. This leads to a quite a few questions:
1. How much has Oda deviated from the original plan?
2. Which characters were core/originally planned and which were not?
3. Which characters are important (regardless of when they were conceptualized)?
4. Which parts of the story are integral to the actual real story and which is just irrelevant?
5. Which character groups are fillers?
My personal opinion to the above is that:
1. The blueprint, the main concept is still there, but Oda will or has deviated from it or will deviate from it a little because of the story going on for much longer than he anticipated (his timeline towards ending is shit).
2. We know the Marines and Yonkos were part of the main thing, idk which Admirals though, Warlords not so much because they are abolished, SNs too are in the end side characters. Gorosei and Imu and Dragon and RA were always part of the story. Holy Knights are I think just addons.
3. Law, Bonney, new Admirals (idk if they were part of the original concept).
4. Long Ring Long Island is an example of an irrelevant arc imo. Wano seems pretty important though idk what the original plan was. Alabasta, Skypeia, TB, Egghead, Elbaf, MF saga are important ones imo. Yeah I know W7 and EL was pretty dope but how much relevant is it now (apart from crew members Robin, Usopp, Franky and Sunny). But again this is just personal opinion and pretty subjective and I dont remember much of those arcs. Wano, Skypeia, Alabasta, Egghead are tied to the history, Elbaf probably too. @Salah WG has me convinced that TB will serve as sort of a blueprint for the final saga, MF is MF. WCI and Zou are just there for the poneglyphs, FI has more ties to endgame (even though I hate it).
5. Scabbards, SNs, Holy Knights, CP0-9 (pretty cool but might be wrong), Warlords (important ones converged into Yonko).
Then we also have things like Crocodile being introduced and defeated too early, the Warlords not being a thing from the start. And post Wano being called to where the real story starts. This leads to a quite a few questions:
1. How much has Oda deviated from the original plan?
2. Which characters were core/originally planned and which were not?
3. Which characters are important (regardless of when they were conceptualized)?
4. Which parts of the story are integral to the actual real story and which is just irrelevant?
5. Which character groups are fillers?
My personal opinion to the above is that:
1. The blueprint, the main concept is still there, but Oda will or has deviated from it or will deviate from it a little because of the story going on for much longer than he anticipated (his timeline towards ending is shit).
2. We know the Marines and Yonkos were part of the main thing, idk which Admirals though, Warlords not so much because they are abolished, SNs too are in the end side characters. Gorosei and Imu and Dragon and RA were always part of the story. Holy Knights are I think just addons.
3. Law, Bonney, new Admirals (idk if they were part of the original concept).
4. Long Ring Long Island is an example of an irrelevant arc imo. Wano seems pretty important though idk what the original plan was. Alabasta, Skypeia, TB, Egghead, Elbaf, MF saga are important ones imo. Yeah I know W7 and EL was pretty dope but how much relevant is it now (apart from crew members Robin, Usopp, Franky and Sunny). But again this is just personal opinion and pretty subjective and I dont remember much of those arcs. Wano, Skypeia, Alabasta, Egghead are tied to the history, Elbaf probably too. @Salah WG has me convinced that TB will serve as sort of a blueprint for the final saga, MF is MF. WCI and Zou are just there for the poneglyphs, FI has more ties to endgame (even though I hate it).
5. Scabbards, SNs, Holy Knights, CP0-9 (pretty cool but might be wrong), Warlords (important ones converged into Yonko).