It takes time to design new stages.
But if it were just me, I would add :
- An Oxfordian-esque highschool (you start on the roof, you end up in the schoolyard/many students in suits)
- Helena's office on her ship (you start in her office, you end up on Freedom Survivor's deck)
- A ballroom like in Beauty and the Beast (giant windows, enormous chandelier and gilding on the walls)
- Banpo Bridge in Seoul (danger zones trigger slippery areas and rainbow effects)
Would be nice in DOA6 if every character could have his own home stage.