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It's not the same style as the other drawings, but hey, that's what you get when KrackoCloud has to draw more than one person. :U
(Can image restrictions be rotated? Like, 480x640)
Sanae is the 11th mostly just because they're both kinda wacky. Yeah. Also sonic gohei sounds kinda cool.
Yukari is River, because, well, it works! Not the relationship with the Doctor, of course, but the personality - that whole gig where River is always everywhere and always playfully withholds information. Can't you just imagine her saying, "Hello Sweetie"?
After kicking ideas around in my head, I think Miko or one of the 10D crew could pull it off decently, given their goal of immortality (and Miko's headpieces could be evocative of the Cyber-helmets). If we're going with the old-series Cybermen, an image I always had in my head was them being taken out by Komachi's coin danmaku due to their weakness to gold.
I'm not sure how much of a stretch it is, but I always thought Alice's dolls could make good Autons.
Miko sounds like a good idea, thanks.
As for the dolls, I was thinking they'd go with Medicine to be peg dolls, but Autons work pretty well too.