Check out chapter 397 on the page before last.
Aizen says to ichigo, "you are the son of a shinigami and ..."
And that's when ichigo's father appears to interupt him, so a lot of people assumed he meant shinigami and human.
But, ichigo already knew he was the son of a human, so whats the point of ishin interupting aizen when hes already revealed the supposed surprising fact (he had already said "shinigami").
The above doesnt make any sense on either the characters or (especially)the authors standpoint.

I got another prediction that's been sitting on the backburner for a little bit, but I'll say it now. Ichigo and Ishida are twin brothers. That's why Uryu has never met his mom, and why his "dad" who is actually his uncle, Misaki's brother, behaves so coldly to him.

The only thing is how Kubo let his mom get killed so easily if she was a Quincy.

Actually, she did notice Grand Fisher, since she knew to get her son away from it. And as for why she couldn't kill it, that could be explained in one of many ways. First, maybe she had the strength/skill level at or lower than Ishida Uryu. As his father likes to point out, Uryu is basically talentless as Quincy go. Masaki could also be talentless. Second, Grand Fisher was apparently uber strong (until all the power levels got messed up... think Vegeta or Nappa from the first section of DBZ, before the Super Saiyan stuff or Frieza). Grand Fisher was a "Shinigami-killer" who would subsist primarily on trained spirit soldiers and people/beings with high reiatsu. Third, there was no time to fire an arrow (they don't sail at the speed of light), so she just used hirenkyaku and blocked him with her body in the nick of time. Fourth, and admittedly least likely, Grand Fisher HAD Ichigo, but spit him out when she offered herself in exchange.

As to why Ichigo doesn't have Quincy abilities, it's because both of his parents made the conscious decision not to tell their kids about them. Ichigo didn't even understand the concept of reiatsu until Rukia explained it. Ichigo just knew he could see ghosts, but never seemed to care about why until he met Rukia.

Ever heard of the term "adoptive father"? Ya know, Juha Bach getting Masaki with a child, she runs away for reason X with Ichigo in tow ("Son born in darkness" and the fact that he has supressed knownledge of very high level Quincy-techniques seem to be telling us that Ichigo was actually born in Quincy-land) and hooks up with Isshin.

Then to the important things. AKA aside from being a convenient excuse to fill out the "how" for Ichigo getting his latest upgrade, who cares that Bach is apparently Ichigos paternal progenitor? Ichigo has a family, one that he is happy with if you discount the dead mother, so he should just go "who cares" and keep on rolling.

@strixflash. Can't remember either way, but Masakis and Isshins dating is not a factor in determining the paternity issue. After all, one can date women who have had children as well. And whatever anyone has said.. there is always a possibility that someone is lying. Maybe Bach is, maybe Isshin & Co were.

@switchgear. Because Ichigo was just a massive lump of power with no specific shape or purpose when Rukia met him, due to said suppression of the Quincy powers. Ichigo took Rukias power and with that, his spiritual power gained .. a shape, if you will. A kind of a focus as to use his power. It seems a part of Ichigos protagonist talent that he can assume all know ways of using reiatsu rather easily, seeing as he became a Shinigami/Hollow hybrid without Aizen having a hand in it, unlike with the others, and learned Fullbring while (as far as we know) not quite fulfilling the requirement of having the mother being attacked by a hollow while pregnant.

And yes, all of this is just theory with some (but not solid) backing from the material we've seen so far. The most important thing to remember is that people can lie. Bach can lie, Aizen can lie, Urahara and Isshin can lie. Not a single stated thing must be true. They just may be true.

Actually guys, i think this the first time kubo didnt pull one out of his ass and actually thought of it a long time ago.
Check out chapter 397 on the page before last.
Aizen says to ichigo, "you are the son of a shinigami and ..."
And that's when ichigo's father appears to interupt him, so a lot of people assumed he meant shinigami and human.
But, ichigo already knew he was the son of a human, so whats the point of ishin interupting aizen when hes already revealed the supposed surprising fact (he had already said "shinigami").
The above doesnt make any sense on either the characters or (especially)the authors standpoint.
Second but not less important, beeing the son of a shinigami and a human never stroke me as something really special for aizen to set his eyes on since the time ichigo was born, that also made the whole deal more difficult to accept for me back then, so i thought there should be something more going on, but after some time of waiting in vain i thought kubo changed his mind about the whole thing and so i had given up hope of ever finding out.
Taking into account also that aizen has been referenced twice in the last few chapters, also makes me believe that there is some deeper connection than i initially thought.
So, after all this i have to say, well done kubo this is the first true twist i have seen in this manga,
it was about time

WTF was that?! No no no! Come on Kubo Tite, what are you doing! You're killing BLEACH for Christ's sake!

As for Isshin being his dad, I'm 90% sure he is since their Zanpakutou's are just too similar for it to be anything else but you never know since this is Kubo.

Whatever the case, I still find this series more interesting than One Piece at least.
Bleach is something I wouldn't want to end. Not until we learn about soul reapers in other continents at least.

I mean the fact that the swords are so similar that Isshin even knew how to power it up has to prove that he is the father. His "dad" uses Getsuga Tensho for f***ks sake, COME KUBO! get it together..