This is a really confusing to me.
Anyone and any race can be a member of the Imperial Legion, you see Nords (Rikke), Imperials (Tullius) and even Altmer (Fasendil) in their ranks. We also know Osimer play a decent role in the Legion as smiths and warriors. In general, the Imperial Legion seems to be an equal-opportunity employer.
Character identity seems to be often communicated by Faction / Race... ie: Rikke would be an Imperial Nord (as opposed to a Stormcloak Nords like Galmar Stone-fist), or you would say Fasendil is an Imperial Altmer (, Orcs in the service of the Empire as Imperial Orcs... This makes good sense.
By that design what do you call General Tullius... an Imperial Imperial? I don't believe I've ever heard that used ingame (for obvious reasons).
The point is moot regarding something like the Thalmor. Thalmor=Altmer but Altmer=/=Thalmor. This is why you never hear someone saying a Thalmor Orc, or a Thalmor Altmer... using Thalmor implies Altmer as a race unlike "Imperial" in the Fasendil example above.
What do you say if a native of Cyrodiil (race=Imperial) joins the Stormcloaks... do you call them a Stormcloak Imperial? An Imperial Stormcloak? I don't recall hearing this in the game either, but surely not everyone in Cyrodiil is loyal to the Empire so this situation must arise at some point?
"Imperial" just does not make sense to me as a name of a race, when the same word is used for faction membership. The term "Cyrodilic" is used in game to describe objects from Cyrodiil, namely brandy and a spadetail fish, but perhaps like Asian/Oriental there would be a different words for people/objects. Cyrodilian? Cyrolian? I guess every time I hear "Imperial" in the game, my mind goes first to the Imperial Legion and not the race, because that name does not evoke anything of a place to me. That being said, none of the other race names are based off the regions' names from which they hail. Nords are not Skyrimmers, Bretons are not High Rockers, and Kajiit are not Elsweyrians.
Am I alone in finding this confusing? Perhaps earlier TES games explain this so it make more sense for other players?
Skyrim is my first TES game, apologies if this is a new player question or otherwise displays my lack of oldschool legitimacy.

