"Phase 4" but mainly since it doesn't seem like there's one in particular thats a threat and Hayate and Ryu killed them with no effort
till september, we're already got 3 guest character.. if one year 4 season pass.. 4 x 2 (average guest) = 8 6 year life span . 8 character x 6 = 48 guest character.
Hopefully not Eliot tho since he's basically a girl in my eyes xD but they'd probably give his style to some young girl named Ellie or something -_-
I can only think Raidou since he died in DOA6 (since I just saw Final Boss for DOA6). I don't see any DOA6 cast currently getting removed (unless they have new generation type like SFIII, Tekken 3, SCV, & MKX).