They Have Latin Names, il accept this part Because it's hard to make up Naming schemes for 9 Races
They Wear Historically Accurate Roman Armour
They Have Roman Ranks
They Have Roman Haircuts
Their Land Matches the description of Italy
They Have Arenas (which they use people and animals in, rather than the logical choice of Cheap and immortal Daedra that Oblivion Provides)
They Are "Civilised "
Tullius Looks like Caesar!!
I am Surprised that they do not Wear Togas and Enslave people.
Imperials have Latin names, but they're always pronounced (incorrectly) in English rather than Latin. It would sound very different if Imperials actually used Latin pronunciations.
Their ranks aren't actually very Roman at all. Instead of legionaries, they have legionnaires. The legatus is the highest recognised military rank, but those are the only two I can think of in the games; legionnaire and legate. There are no vexilarii, centurions, cataphractarii, numidarum, sagittariorum, cohorts, exploratores, praetorian guards, etc.
I've only seen one Roman haircut. Not much variety.
Daedra in arenas would require a constant mage presence, with the mage's full attention on keeping the daedra under control and only attacking his opponent. The Doors of Oblivion explains the kind of focus that would be needed, if you're interested.
I'm not seeing the resemblance between Tullius and Caesar, based off of Caesar's bust. Tullius doesn't even have an aquiline nose.
With the changes to Imperial armour, maybe they do wear togas in Cyrodiil now.
Imperials are a lot less Roman-like than they look. If you do some reading, they're a very interesting and even unique culture, just like the other cultures in the Elder Scrolls. All of them have similarities to actual cultures, but it's hard (if not impossible) to make a culture with no similarities at all.
Sometimes I think the 'extended' lore might as well be seperate from the games though, other than minor references bordering on easter egg level (painted cows) or a small selection of in-game books, the game itself doesn't present the wierd lore much at all. It's hardly integrated, Nords will come off to most as just Vikings, Imperials as Romans too, which is annoying, and frankly not their fault.
Morrowind was probably the best at visual and dialogue presentation of strange concepts, and I'm not some kind of MW elitist, it had it's own batch of problems, so don't start blowing horns and getting tetchy, it just seems obvious in that sense.
Most of MK's out of game lore is mentioned in the games. The 36 Lessons of Vivec and Mythic Dawn Commentary 3 mention CHIM and reshaping the world (which pales in weirdness compared to the part with Vivec and Molag Bal
). One of the Commentaries also mentions the Wheel. Heimskr (the Talos preacher) in Windhelm quotes the second part of From the Many-Headed Talos. Some of it could be considered "easter eggs," but CHIM in particular is discussed in the game books in too great detail to be considered that. The Godhead and kalpas aren't too unusual. They're very similar to Brahma and kalpas in Hinduism.