So, I started playing a ghost. She came with the neighborhood.
There's a few differences that I've found with her. Other people can't call her up to visit.
And, even though she's at Piano Level 6, she never gets the "Write Songs" option. It's too bad, since that's one of the aspirations she needs to achieve to move on to the next level.
Have you played a ghost yet? How has it been for you? Any glitches or interesting things happening?
By the way, here she is with the fishnet catsuit and no bra: