i took these screengrabs of the lead character designer's working desk, where i could spot a sheet showing 16 character's concept art that Daishi draws attention to by hastily trying to hide it (ha!).
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you can even read "Ivy", "Nightmare" and "Tira" in katakana on his PC screen.(and maybe "Maxi" or "Viola", but it's really hard to see). so we could have confirmed them long ago already. i tried to edit it up a little bit.
EDIT: and there's "Voldo" on the screen, too, next to Maxi. but i'm too lazy to edit the pic again.
EDIT: Also, Ivy's name is written アイヴィー in katakana, but the ー is missing in my picture edit. still visible on the PC screen, though.
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unfortunately, the vid was only available in 740p. does somebody has a 1024p version? or maybe my graphic card could have reduced the vid's/screenshot's quality? (my PC is crappy).
so, regarding the evidence (third from right, bottom row), we can pretty safely assume that some kimono-wearing setsuka look-alike or setsuka herself is in, huh?
i also see viola's, nightmare's, leixia's and raphael's concepts in there. does anybody recognize somebody's already released design?
also, i noticed that his reference books are from SC1 and SCIV. SC1 art had some really nice unused character designs:
http://8wayrun.com/threads/early-se-sc-concept-art.6616/