Red is a demon (or something like that) that possesed a game called "Godzilla: Monster of Monsters", slowly turning it into mix of Silent Hill and a NES Game (at least there was fun bosses that he made, including Orga, Biollante, King Ghidorah, etc). He first appeared in creepypasta story (kinda creepypasta, its a bit different and lacks real blood) and will (possibly) appear in Colossal Kaiju Combat with another demon, Solomon (still the best 1973)
More information on him if you don`t want to read whole creepypasta:
https://kaijucombat.wiki.zoho.com/Shadow-of-Red.html