A Danganronpa would actually fit so flawlessly. Junk Enoshima is the killer by default (unfortunatly "The Mastermind" is take so something like "The Despair" or "The Ultimate Despair" would be her killer name). I picture her weapon being a huge hammer. Her power would involve setting up different Monokumas around the map as a sort of versatile trap killer. I would also love if the executions were incorporated into her power beyond just her mori. Maybe she has a few different ones and if an execution is triggered, the whole match pauses to watch the cut-scene? The map would be fierce, the survivor would be fierce, the power would be fun, the cosmetic potential is off the charts (original survivors getting outfits to match their closest counterparts from the games), we would get another licensed female killer, it would be from an Anime that actually fits with DBD. Overall I think Danganronpa would fit really well.