So, we have come up with cultures. They don't have a background yet, but we loosely based them on real civilizations, then... Changed them around, alot. You'll see.
French/Germanic = Adranic
Polytheistic pantheon, slavery is ok and widespread (they buy their slaves from Duluks and Haegars). Polygamy exists - a woman can have many husbands, a man many wives.
Spanish = Altanic
Polytheists with the same pantheon as Adranics, no slavery but human sacrifices => Nobleborn prisoners of wars, Altanic or any other culture, are imprisoned in a room full of salt with glass walls, and the people watch as they die from thirst. Monogamous, but mistresses (and misters(?)) are accepted. Trade very present.
Vikings = Haegars
Raiders and pirates. Polytheists, but they have their own gods. They burn the bodies of warriors, and bury the warriors who managed to kill at least one Haegar before dying. Peasants are sold as slaves. Best archers of the known world. They are strictly monogamic, women are equal to men, they keep no slaves for themselves.
Mongols = Duluks
Mounted raiders. Polytheists, their own pantheon. Have a strict honor code, universally respected. They sell their enemies into slavery, all except the Duluks.
Egyptians = Saelradians
Republic. The ruler is a God, and his divinity goes from ruler to ruler. The people, the voters, are those who grant said divinity. The rulers who turn tyrant were possessed by demons at the time of the elections.
Greeks = Ralkarians
Decadent and extremely rich, great traders. They do not enforce any religion, and as such there are a lot of different temples in their cities. The richest man in the nation is the ruler - since they control taxes, they have a tendency to remain the rulers for all their lives.
Arabic = Ampyrians
Matriarchal, amazon-like culture. Monotheists.
Chinese = Selenids
Foul mouthed, notoriously dishonorable. Value the lives of their own. Monotheists.
Feel free to comment or to criticize.