User blog comment:ClassicFan92/Theory on Irene/@comment-62.113.23.99-20160912181509

She can't be Erza's mom because she looks young(maybe she went into Tsunade mode). And I also thought about her being Erza Knightwalker, but I doubt it, I actually don't think that it's complicated, she might just be Erza's sister, and I have a feeling that she is related to the tower of heaven and to Brain/Zero.