Since Oda has confirmed in Jump Festa that One Piece is entering its endgame, I decided to make a thread to keep track of all the unresolved plot and character threads that still need to be resolved. The idea is I list what I can think of and people can add onto the many things I'll probably forget as well as discuss certain plot threads they really hope are not rushed or forgotten by Oda.
In terms of main stuff, the biggest stuff I can think of are as follows;
1. Elbaf
2. Big Mom's possible memory manipulation
3. The Final Road Poneglyph
4. One Piece and the Will of D
5. The Final War
6. Shank's death/Returning the Strawhat
7. Blackbeard Flashback
8. Possible further Roger flashback (though Oda might have shortcut-ted that with the Oden flashback)
9. What happened at the Reverie? (especially with Vivi)
10. Who is Imam? What is the meaning of the Straw Hat?
11. Doflamingo and the secrets he knows
12. Aokiji joining the Blackbeard Pirates
13. What happened in the Void Century?
14. Joy Boy and the promise he made (how is this related to Zou?)
15. Fishman Island's destruction
16. Fallout of the dissolution of the Shickibukai (what new weapon or system will replace them?)
17. Marine Schism
18. Everyone's dreams, especially Zoro vs Mihawk and Mihawk's probable death at the hands of Zoro's final opponent.
19. Vegapunk
20. Ancient Weapons
These are the big stuff off the top of my head, aside from that there's side content of varying importance including characters we want to see get more of a resolution or role in the final war
1. Ryokugyu introduction
2. Coby
3. Enel on the moon
4. Urouge
5. Kuma and Bonney
6. Magellan
7. Hancock
8. Buggy
9. Weevil
10. Strawhat Grand Fleet
11. Pudding and The Three Eyed Race
12. Rayleigh and Shakky
13. Katakuri
14. CP0
That's all from the top of my head and that alone is a lot to resolve in 7-10 years regardless of how much Oda insists that he's wrapping up. Here's hoping he doesn't fumble it by rushing too much.