i'm not sure why everyone is saying kasumi alpha...
i know it's difficult to tell who's under the hood in the ending credits due to all of the post-processing and the sepia effect they use, but kasumi and ayane have very similar faces.
now, going by the modded doa5 videos that were posted before, and assuming they used the exact model from the game (i don't see why they would swap the heads or anything else around, especially if they're using kasumi's moveset), you can very clearly see ayane's short purple hair underneath the hood.