I used a World of Nintendo Princess Peach. I sculpted the dress from scratch, and the legs are from a random anime figure I had lying around. The Luigi is a Bandai Figuarts figure. I filled in the joints to make him a statue, and the hands were modified to hold the Poltergust. The Poltergust and the ghost were sculpted from scratch.
If you would like to see more pictures, please go to My Flickr Page.