Because I love the idea of this thread, here are a few more;
Godzilla
Godzilla and Hedorah
Battra
Biollante
Fire Rodan
Gigan
Mecha-King Ghidorah
Godzilla Junior
M.O.G.E.R.A.
Megalon
Gamera
Gyaos
Gamera & Gyaos
Zigra
Viras
Mechani-Kong (more from the cartoon then KK Escapes)
Gappa
Ultraman
Aboras
Z-TON
Earthtron
Eleking
Verokron
Twin Tail
Baltan
Telesdon and Bemular
A made up kaiju with some rather strange looking guts