I’d love to see a decent war of the worlds. But Mothra would be good too. That said, thanks to Mike for asking about the -1 and to Marc for answering. I was too embarrassed to ask.
I have an idea for Gamera, set it as a sequel to the heisei Gamera trilogy, don't know how the final fight turned out, but people a few years or decades after that trilogy would be a great back drop.