Kawai Moonsault
I don't have one of these interestingly-shaped instruments ("interesting" being another word for rather impractical!), but I'd be most interested in adding one to my collection of KS range guitars.
I've seen one or two appear on eBay over the years, but never had the cash to bid/buy one.
Apart from the unusual shape, these guitars also featured a range of on-board active electronics as well as the coil split and phase switches which were included on the KS range.