Weird things keep happening.
It seems the so called full-blood reptilians mentioned by the poster on /x/ are alien hybrids created through genetic engineering, and they are not recognized by Gensokyo. Rather they are "toxic substance" placed in a reptilian humanoid form and should be removed from the planet (and anywhere, because they are not a race created by a god and have no connection with any original source/nebula).

So to sum this shit up:
Original humans left the Earth surface ~150 000 years ago, only one of them remained, Kain, the first vampire. 2 or 3 of the other original humans for some reason split themselves into shards which incarnated as many different people. They used an alien genetically engineered race for this; this race is derived from fungus but they are a legit race. Through the following period these alien inserts degenerated and were eventually locked up underground by vampires and native reptilians. Later vampires took them back up again to create more vampires from the fungus human base DNA.

Somewhere in this, aliens came to Earth and inserted engineered reptilians which are not be considered real beings, they're just toxic waste formed into souls. Somewhere along the progress of history, they formed an inner cabal alongside native reptilians and vampires.

Vampire are immortals and native reptilians have psychic abilities. Alien reptilians sought to imitate this, but became the layer on the outskirts of this cabal. They are what we call the NWO. Human degenerates are outside of this group and do not know much about native reptilians or vampires, that's how they came to support the so called NWO-illuminati faction.