No Taiga?

Apparently not. And I labeled some but have no idea on those last two; my search-fu is weak tonight.

don't quote me but I think the unlabled in his neck is from to heart, never played/watched it so its a stab in the dark.

Kugimiya never voiced any To Heart characters as far as I know, and besides, aren't those uniforms normally red rather than blue?

RaikenTB said:
No Taiga?

When this image was uploaded to the Japanese Uncyclopedia, only four episodes of Toradora! had aired. Probably the original image was made before any of Toradora! aired.

Your lack of Mizore displeases me.

Still no info on the last remaining untagged girl? (peeking out of the neck of the armor, on our right side)

Untagged girl = Kuonji_Yume?

Not likely. All the characters depicted should be voiced by Kugimiya Rie. ANN lists Kuonji Yume as being voiced by a Minamori Shizuka.

I noticed that as well, but that's who I immediately thought of. No one else really comes to mind.

The only Kugimiya role I can think of that had characters with uniforms like that would be Kataoka Yuuki ..but the similarities between her and the untagged girl are pretty sparse. I've been looking through a list of her roles and haven't turned up anything yet for the ones I've found pictures of.

Oh. But, uh. I have updated the source with a pixiv link and added the artist's tag, though. There seems to be a larger version of it there, but I figured uploading it could wait until this mystery is solved.

Don't replace the source unless the image actually comes from said source fffffffff

http://www.pixiv.net/member_illust.php?mode=medium&illust_id=946048

Eh? No, I suppose this exact version didn't come from there. I was just assuming that the artist's page would be a more accurate source than something like the Japanese uncyclopedia. Since the source field seems to be far more specific than I thought, my apologies. I've put the old source back.

For those who missed it, the last girl has been identified (by the artist) as Magami_Megumi from a game called Only_you_Recross.

Maybe the seiyuu used a false name at the time?