i have found a tiny bit of personality as well.
catherine is a warmongering whore,excuse my language, and she also hates me no matter what.
gandhi takes advantage of his fundamentalism early on to attack everybody in middle ages.
Alexander is relatively peaceful and doesnt build too many cities, and techs nicely.
Hatshetup isn't so much peaceful as she is not demanding, she tends to not bother me and try and work her way up to a culture victory.
That is EXACTLY what I experience as well. Exactly.
I've also noticed that the Aztecs play VERY similarly to how Alexander does. One city, real nice and friendly. Techs in a friendly manner... very odd.
Actually, now that I think about it, I think there is a set number of personalities we see each game. Usually there is:
1. An ally to us. Usually builds 1 to 2 cities and techs up in a non-military fashion and sells techs to us for good prices.
2. A military enemy to us, usually in the shape of Catherine.
3. A cultural or science enemy to us. They'll declare war just because they are our enemy. They'll send a few units to attack us. Usually Ghandi or China.
4. Neutral. They swing either way.
This is about how it goes every game for me. I rarely get other personalities and, if I do, they usually fit into the neutral category. I do bet that there is some sort of personality list where the varying civs have differing values and the game requires a certain number of personalities to be present at any given time.
So we have the 4 above personalities and each enemy civ has a chance of being one of them and the chance depends on the value that was given to the civ. We may see something like...
Warmonger:
Catherine - 1 (highest)
Alexander - 4 (lowest)
Peaceful Ally:
Alexander - 1
Catherine - 4
This would explain the random personalities as well as the 'set in stone' personalities. Of course, if you don't see any Warmongering enemies in the game, you may see a generally peaceful civ, like India, be a warmonger.