It may be best to give this Nina her own tag since it seems she's an amalgam of at least the first three Ninas. May be best to tag her as nina_(onimusha_soul).
Found from the official site she has 4 different outfits, each seems to be based off of each version of Nina's outfit in the BoF series. G1 is based on Nina II's outfit while G3 is based on Nina III's outfit.
G5 is looks to be based on Nina IV's outfit. G7 looks to to be an original outfit.