It's Vincent's game, of course.
And Vincent's 'Aerith' is Lucrecia.

So...here's what I want to know.

How many times, if any, does Lucrecia appear to Vincent in spirit form? If any? Lucrecia has a ton of JENOVA in her, if Sephiroth can manifest his memetic legacy, it stands to reason Lucrecia might well be able to pull the same stunt.

To me in FF7 it looks like she never really died, at least, not completley.

Actually... she appears mostly through Vincent's flashbacks.

Though she did actively help him in the end, through Shelke, that is.

so you think that she could still be alive? I know she appeared in the cave in ff 7, but was that her spirit or is she alive or what lol

From the scans i have found she looks very died...we can also see her spirit protecting Vincent :no:
She might have fallen in a coma or something... :/