The King of Destruction (presumably). A reptile living on an island that was exposed to an atomic bomb, transforming it through the power of the atom. Attacks: Atomic Breath Claws Tail

Godzilla's rival (presumably). The original Ghidorah was defeated by Godzilla, and its remains were recovered by the government. It has three heads, and every head can fire gravity beams (the combined power of the three beams is roughly equal to one of Godzilla's). It can also discharge lightning and deliver powerful bites.

A kaiju that is an ally to humanity. She scatters scales from her wings. Coming into contact with these scales causes paralysis. Her design is modeled after a moth.

An anti-Godzilla weapon built by the government using the remains of Ghidorah. It has a very mechanical appearance. It is capable of firing a laser beam.

Created when Godzilla's G-cells attached to a plant. It attacks using its vines.

Created when Godzilla's G-cells attached to sludge. It possesses high intelligence and can create walls capable of reflecting atomic breath.

An upgraded, superior form of Mothra. It is capable of striking with lightning.

Attacks using sonic booms, powerful gusts (flapping), aerial combat, and high-speed ramming. It strikes enemies with its sharp beak and talons and can fire a Uranium Heat Beam. A Pteranodon transformed into Rodan via radiation, then further evolved into Fire Rodan due to geothermal heat and other factors.

A Godzilla born in space. It is far more powerful than the original Godzilla.

Attacks by biting, ramming, and using its tail. Presumably an evolved Ankylosaurus.