Griffon

Also known as Griffon or Black Moth. Originating from 1969 kaiju film directed by Ishiro Honda called Latitude Zero, this monster was born when Doctor Malic transplanted the brain of Kroiga, a female captain of Black Shark submarine, into a body of a male lion with condor wings attached to it, then mutated through a growth serum. As per usual in monster movies, Kroiga eventually turned on her creator and caused the Alpha submarine's laser to destroy the Blood Rock, burying her and her creator under the debris.

Kroiga was first introduced to Godzilla franchise along with appearing in the Godzilla Wars line of trading cards. She would later be featured in the comic 4-Panel Land: Godzilla Word from 1993. Also, she was present in Monster Planet novels, attacking Egypt in June 2021, then reappeared in 2042 in North Africa.

What's your opinion on this kaiju?

Kroiga

Raban

A new, bigger Anguirus

Dagahra

Mechagodzilla (Post credits scene, duh)

Megalon (Maybe his origin can be that he was a mutated member of the Hybrid Kumongas)

Hedorah (Maybe the blue Hedorah/Yog like things inside the Hybrid Kumonga that got mutated into Megalon came out of him and mutated into Hedorah)

Behemoth (Toho needs to use him, as long as they get the rights from Warner Bros. and Legendary)

Biollante