(And yes, Gyaos was bio-glowy before any other kaiju!)
Now this is something intuitive. I really like how faithfull yet radically different this design is, aswell as the implications of a relation to Irys (could ofc just be me seeing his head that way).
I also find it really cool that you gave Gyaos two different modes, really nice that you included something whack xD
That's a pretty big if. Gamera's nowhere near as popular as Godzilla or Kong, so his name won't rack in big bucks in here in North America, not helped by the legal issues and rivalries involved.
Sad as it is, the effort of getting Gamera into the monsterverse is not worth the time and effort. Barley any Americans even known about Gamera (and many who do just see the cheesy 60's movies as what defines him), and studios hate taking risks.
Especially for something that's doing poorly to begin with, honestly I am quite worried about the Monsterverse. KOTM was a surprising miss-step for the monsterverse, and the bad word of mouth really has me worried me about GvK.
Personally I just wanna see Gamera get well...anything, regardless of if it is a part apart of the monsterverse, which is almost certainty strictly for Toho kaiju (and Kong...who himself has strong ties to Godzilla).
Honestly part of me actually prefers the idea Gamera NOT being in the monstervse, and instead getting his own new series with it's own unique mythology and concepts.