This is something Neil pinned on me a while back; it come up casually at first, "Fujisawa's daughter in the ending of MW..." I didn't know what he was talking about. Long story short, he's referring to a particular image that comes in the ending of the original MW. As most of you should know, the ending of MW features pastel images of all the El-Hazard characters on Earth. We all know Makoto got back ... did perhaps the priestesses in addition to the Earth people all decide to go to Earth? That's another topic for another time I suppose, but in the meantime, here's the image in question:

Ah, Fujisawa finally got to climb one of those Earth mountains again, y'know, the ones where it's cold and there's snow and such

Next to him, we can clearly see another person. Now, by default everyone on my side (me, my sister, my brother) instantly assume this to be Miz. Who else, after all? Neil persistently insists this is not Miz, but Fujisawa's daughter.
Here's the only known official shot of Fujisawa's indeterminable gender child, which came in Alternative World, much after MW was produced.

The only thing we can say for sure is that the child has brown hair.
The figure in the pastel image also seems to have brown hair. (It's a tad hard to be 100% sure because the pastel's naturally have a little color distortion, but we'll accept the fact)
Also, the eyes, which you can't cleary see in that shot, are somewhat wide which, by El-Hazard standards, does typically indicate youth. To illustrate:

The adult cast in the series typically have narrowed eyes...

And the children have wider eyes.
The only exception to this rule seems to be Katsuhiko and most of the student council. Seems student government accelerates your eyeball aging process

But this is the general "rule of thumb".
So the figure is short, seems to have brown hair, and is wide-eyed. We don't know the person from the series, and can deduce that the long hair probably makes it female.
So ... Fujisawa's daughter is a logical conclusion and one that can be backed up...
I'm still irked, however, that the hair on the supposed "daughter" is the same style as worn by Miz. Now, of course there can be motherly influence genetically and style-wise, so I maintain 95% convinced of Neil's point.