I wouldn't mind seeing more in the mammal and bird department. Beside King Kong, whose owned by a different company, there are only a few mammal Kaiju in Toho films and only King Seeser/Shiisa/etc. in the main Godzilla films. For some reason, the first image to come to mind is a a giant porcupine Kaiju.
For birds, I can only recall one in Toho (Please correct me if I'm wrong) - Ookondoru/Giant Condor from the Ebirah movie, who barely lasted a minute. I don't know what others I would like to see, but I speculate that was the reason why Godzilla the Series had so many birds.
Or heck, even dinosaurs that aren't even theropods, which are a dime a dozen in monster movies in general. Maybe apatosaurus-like creature or Triceratop-like giants.







