User blog comment:Godisme/Everything But The Rain/@comment-1747976-20130301204345/@comment-5388187-20130301234027

Doesn't Aizen state at some point that Ichigo is a human/shinigami hybrid? I believe it was in issue 397 that he says "You are the offspring of a shinigami and-" I assume the last part was going to be either human or quincy.

Also, on a sidenote, how does a soul impregnate a human? Souls are made of reishi and humans/quincy are made of Atoms. Reishi and atoms do not mix well, right? Lol. Even if Isshin was using a gigai, I doubt Urahara made them complete with functioning reproductive systems. And if he did, wouldn't Ichigo be part Human, part gigai?