QUICK RUNDOWN OF CURRENT AESTHETICS INSPIRATION OF EACH STAR NATION/SPECIES IN MY SCI FI UNIVERSE (CUZ WHY NOT✌):; United Empire of Mankind:
50s - 60s Eco-Retro Futurism (Think Pre-war fallout: Utopian Socialism edition); Eternal Arkiahn Emperium:
French Victorian (around later 1800s-early 1900s); Great Vulchran Republic:
Steampunk-Dieselpunk ( With Nordic-Mongolian influence); Free Terris Federation:
Aqua centric (Aquapunk I guess? Anyways, Centered around Edo period Japan culture and especially clothing.); Kazankhat Society of Infinite Progress:
Abstract Futurism? (They're liquid metal beings, kinda hard make an aesthetic lol); Domain of the Void:
Crystal Hell?? (I don't think there can be an aesthetic for these guys xD)