I'd say EVERYONE from DOA5 vanilla + Marie and Nyotengu. I'd be happy if they left out Momiji, Rachel and etc etc.
Honoka can be an unlockable or DLC, but I think it'll be cool to have her in.
I'd love if they went back with the unlockable route like DOA4 for classic characters like Tina or Bass. Having Helena as an unlockable in that game reiterated her classic character status.
Well I'm super glad you don't work for Team NINJA! You want Rachel and Momiji out, but would be happy with Honoka and Marie... not even Jesus could save you.