Whose background story would you like to know?

[natssuu]

Shisui Uchiha.

 

[Floydical]

Wow no one said Nagato yet? Despite knowing a lot about him, we have no idea when Tobi/Madara came into his life (whether he was aware or not) and his actual heritage (like if he's an uchiha in addition to Uzumaki or what).

Basically I want to know everything abot Madara/Tobi/Nagato. After that, Kishi just needs to tell us how Madara survived his battle with the first (since he couldn't use Izanagi), what the secret tech of EMS is, what Kabuto's 'that jutsu' is and what Naruto's 'that jutsu' is (if its not TBB). And ofc we need things like the final Naruto vs. Sasuke battle and the ultimate defeat of the Madara's.

Kisame you don't hear to much about him and he knows who tobi is and might get some clues to who he is

Eh we know a good chunk of Kisame's past now, anymore would be overkill IMO. We do know that he knew who Tobi was and that he looked identical to the guy who controlled the 4th Mizukage (minus the hair). There's nothing more important that his past could tell us.

 

[KAGE RYUU]

jus minato cuz i know he 10x stronger then shown so far

 

[Raidenuser]

Hashirama and his gal, Tobirama, Minato, Kabuto

Kabuto and how he ended up with Oro would be good

 

[Floydical]

All Akatsuki

This would also be quite a bit of overkill. The only akatsuki we know little about are Hidan and Kakuzu. They really didn't have the standard flashbacks of someone who was about to die, but among the akatsuki, they needed it the least.

Hidan is nothing special, really. His only unique quality was his immortality and he know nothing important. And really all we could learn from Kakuzu would have been his battle with the first Hokage. It was assumed that they both survived that battle (because we don't know exactly when it took place), but none the less, that would be important info.

But basically everyone else, Konan, Itachi, Kisame, Sasori, Diedara and Oro are all well covered. Ofc we need to know more about Nagato and Zetsu, but I consider that standard to learn later since they still have a part to play.

 

[Retsu]

Kabuto and how he ended up with Oro would be good

ikr tobirama's stent as kage would also be nice, I wanna see him use his s/t tech, not to mention he had that sword