Fan Casting Primitivans in Tropes

The Primitivans are a race of Reptilian/Insect-like Bioluminescent Creatures that are hostile to humanity and are wiping them out for their warmongering and pollution to Earth. They come in many species and shapes and sizes, from smaller, human-scale creatures to the Alpha of the Primitivans that levels the Mountains. Some species can burrow, some are aquatic and many species even fly. Many species are immune to bullets and even nukes. Most species can operate under a hive mind like intelligence, with thousands, if not millions of Primitivans moving and coordinating as one to attack Human arimes.