>>718633857
Chaos was not present when 40k was first made, back in the Rogue Trader days. It was originally the Imperium (Which was a mix of Robocop, Judge Dredd, and other similar dystopias), Orks (A bit goofier back then, but mostly the same), and Eldar (A bit more alien and high-mystical). Nids were another early faction, and they looked completely different. Chaos came a bit later.