User blog comment:Seieireppa/God Eater: The Butterfly Effect, chapter 6: Unexpected Developments/@comment-14812118-20151014164512

Idk why, I thought a girl would be born instead.

Anyway, how much guys are there whose voices Will could identify so much? Like, there's only 2 men Will could know that much, and one of them would be Isaac himself, in all likelyhood.

It could be a fanfic char, since Will did spend some time with them, but I really doubt that, just to give an example, Ken is Isaac's father. So my bet is that Isaac's father is Sigma himself. Why? Because fuck logic! Yeah, that's why. xD