Huh, I thought there was an unwritten rule 'No Sayoko in AMG doujinshi'. She isn't innocent and therefore an obvious NTR target like Belldandy, she isn't a loli like Skuld and she doesn't have plot device potions like Urd.
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I agree that it is an untapped market, pretty much all the other supporting cast girls in AMG are woefully un-doujinshi'd (okay maybe that is not a good word ;x ).
Whether there is an unwriten rule against it, I have no idea. But it would explain a lot.
I would love to see some/more doujins of Chihiro, Peorth, Sora Hasegawa, & Sayoko.
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