Would it still count as a kaiju fighter if my character was a Biollante that was more in control, and like the other kaiju had a human form, but worked with the humans? Biollante seemed fairly weaker than Godzilla in the movie she was in, and she fought for the humans and had a human's soul, so I think such a character could probably fit the role. If the kaiju fighters absolutely need to be robotic the only other example from the movies I can think of would be that flying submarine thing. Or maybe Jet Jaguar.