Why Yamamoto spared Yhwach 1000 years ago
Urahara´s endgame agenda and last words
Minor character plot lines unresolved
What happened to Nel?
What happened to Grimmjow? (There was a fucking group by /u/darthnick426 [+6] asking for him for years and he just disappears again?)
Halibel's fate
Rangiku's soul and alleged importance in the final arc
Ganju's past
What did Renji ask Urahara?
What are the two kids who live with Urahara? Them niggas ain't human. That bitch fucked up an Arrancar that was fucking up Renji.
How and why did Uryu survive Yhwach's racial cleaning when he was a child? Yhwach mentions it’s, but never explains.
How and why did Ginjo became a Shinigami?
What Stern Ritter K and N stood for
Kubo's original idea of Hell realm arc
The name of Ichigo's Fullbring (I bet it was Zangetsu…meh)
How and when Isshin learned about Final Getsuga Tensho, and against who did he ever use it? (Probably never used it, but he had to have learned it - cause he was going to use it?)
Orihime’s powers that trespasses God’s Territory
Ichigo's sisters being implied to have powers
What was Karin doing that seemed suspicious when Ichigo lost his powers?
Tatsuki developing spiritual sensitivity
The purpose of the Soul tickets that Kyoraku gave to Tatsuki, Keigo, and Mizuiro
Komamura’s fate (Probably dead seeing how Iba replaced him…)
Yoruichi's god armor AND her brother
Yachiru having Shikai when she herself was a Zanpakuto
Orihime's implied inner corruption from the HM arc
Who are the other immortal prisoners in the SS Prison
What was Rukia's first visit to the human world which she doesn't remember
What happened to Lille Barro
What is happening with the Royal Guard
Rose and Kensei's fate? (They are alive, but how did Mayuri revive them when they were dead?)
How communication is possible within the Dangai if time goes 2000 times slower
Is Ichigo’s Hollow Merged Bankai Mode really his strongest pinnacle mode? Is it really that disappointingly weak?