User blog comment:CoolJazzman/Other Special War Powers?/@comment-4026406-20130501103544

I know it's farfetched, but what if one of them is Karin? She was seen at Urahara's in the Fullbring Arc, where she expressed her desire to protect the town for Ichigo. Yeah, it's unlikely, but assuming that Isshin and Masaki also fathered the twins, then it's likely that she might have hidden potential. I doubt she would be strong enough, but Kubo could pull a fast one. 17+ months is a long time to skip, and if he were going to give her powers, making her strong out of the blue would not really be out of the blue when you consider how much time passed.

IDK. I just hope that it's not someone that we expect. There's a tiny bit of precedent, a tiny hint that Karin could have powers now. Maybe she's a lot stronger than we even realize.