A/N: here are 11 kaiju from the other godzilla films that could fit in the legendary universe.

Spacegodzilla. (except he wouldn't be called Spacegodzilla and he wouldn't be from space).

In this universe he could be placed as not as a creature from space but still have him as sort of a clone. Like a group of scientists were trying to use Godzilla's cells to study but a lab accident happened and caused Godzilla's cells to mix with another creating Spacegodzilla or Crystal Godzilla in this technical term. He wouldn't be able to fly or use telekinesis in this universe though.

Biollante.

She could be placed as like the very representative of nature itself and possibly an Allie of Godzilla or not and not an evil creature (like how the games keep poltraying her).

Anguirus, Baragon, Varan, Gorosaurus, Manda and Titanosaurus.

For Anguirus, Baragon, Varan, Gorosaurus and Titanosaurus, you they could be placed as species of dinosaurs that evolved more over others. Manda being a prehistoric sea serpent that also evolved over others as well And Titanosaurus' species probably hunted and ate Manda's species.

Gigan.

He could be placed in this as a Muto who managed to change more and develop to grow more limbs and has gotten bigger.

MechaGodzilla.

You could have him as a secret super weapon the military was making to combat godzilla and and other kaiju.

King Ceasar.

King Ceasar could be as like seen as a god or guardian way back the by an ancient race of people but he was a little aggressive and so they had keep him locked up somewhere until monarch would find him years later.

Austin: but that's just me. What kaiju do you guys think would fit in the legendary universe?