Board Thread:Questions and Answers/@comment-36761202-20190502141942/@comment-29325824-20190502143757

"So who is Yhwatch's mom?"

Nobody knows, as she is in no way relevant. But, it seems like she is just a random human who got somehow impregnated by the SK. Kinda like the Virgin Mary from Christianity, which the Quincy and Yhwach draw heavy inspiration from. Or, as Ichibe theorizes in the novels, her fetus might just have been infused with SK powers that entered the cycle of reincarnation, thereby turning it into Yhwach.

"Do any Quincies go to the Soul Society once they die? I mean, Uryu's father did; he was not absorbed by Yhwatch, at least not until he died the 2nd time (we don't know for sure, I guess)."

AFAIK, yes they do.

"So why haven't there been any Soul Reaper-Quincy hybrids before now (before Ichigo, I mean)? I refuse to believe that they just hated each other so much it was impossible."

Because Quincy and Shinigami powers are normally not compatible. Also, any deceased Quincy would be living exclusively in the Rukongai (with no chance of entering Seireitei), while most Shinigami are born as such and rarely have contact with others.

"And can Quincies become Soul Reapers after they die?"

Not that we know of, and I highly doubt it as they are utterly opposite races.

"Do normal Soul Reapers have to skirt the line between Soul and Hollow to achieve Soul Reaper powers, or is it more like normal Soul Reapers are just incredibly powerful and trained souls?"

What does that even mean?

" Is there no strict, clear dividing line between a powerful Soul and a normal Soul Reaper? Or is the Zanpakuto the real clear dividing difference between the two? After all, Kenpachi was a Soul until he took that Reaper's Asauchi, which is when he became a Soul Reaper, correct?"

AFAIK, being a powerful Soul with a Zanpakuto is required to be considered a Shinigami.

"Do Fullbringers become Hollows once they die? What happens if they are Cleansed and go to the Soul Society? Or can they go to the Soul Society without Cleansing, and if so, where are the Souls that were once Fullbringers? "

They can, we even saw some of them in SS after their deaths, with their powers and memories intact.