I would love Hellfire back, that stage was epic, especially with that Genra Theme "Karma" <3 It would be so cool with that camera angle you had to fight him with too xD Miyama and the Danger zone from DOA2 are also classics although tbh I prefer the 2U versions. Besides the Crimson tho, all the others are sort of meh imo so I don't want those back, especially the ice cave. Why have THAT over the white storm which is way better because it has multiple levels, constant slippery stage hazards, and it's snowing super hard? That's beyond epic in my eyes, DOA6 needs a snow stage xD