In case you don’t know what Kaiju means its a Japanese monster but I wonder what character looks like one in KI?
Probably only Gargos and Raam due to the reptilian-like design.
What about Glacius Riptor and Eyedol?
I would consider Eyedol closer to an Oni, Riptor a dinosaur and Glacius an alien. They don’t really fall into Kaiju to me as much as Gargos and RAAM would because they aren’t alien as much as demonic or in RAAM’s case, a monster since Sera is technically his world.
Well your right about Raam I said Riptor because she reminded me if Godzilla and Eyedol reminds me of Monster X.