>>101514875>>101525229It's probably a sword. Iroha's sleeves are too big, though for it to be her, and the hair doesn't match.
Biboo needs to have her wings, so unless Bae completely covers them up, it might not be her.
It's definitely not Ayame, no horns.
I could see Kanata, but this is clearly meant to be base outfits (or at least modified for the game), and her star would be poking out somewhere, not to mention the wings. This would also probably discredit Biboo.
If I were a betting man, though, I'd say it's...
Honestly probably still gura. I've looked all over and she's the only one with that kind of hair. The only other one I saw that was close was Kaela, who might fit due to sword theme 
