Spoiler:
Anguirus (Singular Point). This is a no-brainer to add the spikey good boi for there are multiple reasons how this could work. We have smaller monsters or monsters that can vary in size (Destroyah, Jet Jaguar (Showa), Skull Crawlers, Gororin, Gyaos, Kusamagami, Hedorah, Rathalos, Attack Titan, Ultraman, Ultraseven, Armored Titan, and Colossal Titan) It was stated in the show that Anguirus was growing at a rapid rate, being bigger than his first appearance. We also need some more Red Dust representation, I love Salunga ALOT but we need more. The Red Dust needs more than one confirmed and one being up in the air. He is also the first Anguirus on-screen (Rip 2001 Angurius never seeing the big screen) to have POWERS. Being able to deflect bullets, his size altering, burrowing and his spikes shooting out (in a video game so that one could be in or not). A very unique combatant, one of the few monsters of the series that we know how they fight, and a great third Anguirus. Also, this is Anguirus, you know the first monster to ever fight Godzilla. A really popular Kaiju and from what I can gather here, everyone wants this new version. Also, he is a good boi and if you don't want him you are wrong