Characters...
	Concept art and 3D models...
	Extreme Power...

Character	How to Unlock
Anguirus	Defeat "Hedorah Terrorizes San Francisco" stage
Destoroyah	Defeat "Monster Island, The Final Battle" stage
King Ghidorah	Defeat "Mecha King Ghidorah Ravages Bangkok" stage
Fire Rodan	Defeat "Biollante Attacks Paris" stage
Gigan	Beat "Ebirah Swamps" level.
Krystalak	Unlock all other characters but Biolantte attacks Paris, then beat it and you will get Krystaslak along with Fire Rodan.

Art or model	How to unlock
Any playable character	Defeat "Monster Island, The Final Battle" level with that character
Atorgon	Defeat "Atlantis Rises From The Deep" level
Baragon	Defeat "Hedorah Terrorizes San Francisco" level
Biollante	Defeat "Biollante Attacks Paris" level
Destoroyah (NPC)	Defeat "Monster Island, The Final Battle" level
Ebirah	Defeat "Ebirah Swamps Tokyo" level
Hedorah	Defeat "Hedorah Terrorizes San Francisco" level
Jet Jaguar	Defeat "Orga Thrashes Sydney" level
Manda	Defeat "Atlantis Rises From The Deep" level
Mecha King Ghidorah	Defeat "Mecha King Ghidorah Ravages Bangkok" level
Mechagodzilla	Defeat "Cairo Is...Lost In Space" level
Megaguirus	Defeat "Biollante Attacks Paris" level
Moguera	Defeat "Mecha King Ghidorah Ravages Bangkok" level
Orga	Defeat "Orga Thrashes Sydney" level
SpaceGodzilla	Defeat "Monster Island, The Final Battle" level
The Sphinx	Defeat "Cairo Is...Lost In Space" level

Beat "Monster Island- Final Battle" on Survival Mode.