It doesn't look like we're going to be getting any canonical information, but some interesting WHAT IF mapping of the Natsuki family tree seems to be getting developed between Re:ZERO's new light novel 9, and the upcoming volume 10, out October 25th.

In the case of the former, the series editor has gone onto Twitter to reveal the hair colors of Natsuki Rigel and Natsuki Spica (it's worth noting, Subaru is the japanese name for the constellation Pleiades, so there's a naming scheming going on there.)

And, completing the color version of the WHAT IF designs

Also, goods and pin-ups have been playing with the idea of what if Emilia was a girl from a magical world summoned into the real one. Looking ahead to volume 10, preview illustrations have shown Subaru's encounter with a mysterious silver haired transfer student... and his home life meeting with a strange man putting him in what the caption is calling a pro-wrestling move, with a mystery woman watching on...

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Scott Green is editor and reporter for anime and manga at geek entertainment site Ain't It Cool News. Follow him on Twitter at @aicnanime.