There seem to be several areas of disagreement here - some of which are based on D&D and its tropes and how they mesh with Game of Thrones and its.
First, GoT absolutely does have PCs. It has high death rates - but I played WFRP before ever playing D&D. The younger Starks (Jon, Arya, and possibly Sansa) are pretty obviously PCs (Sansa I'd say is a probable PC but definitely not a D&D PC).
Second, Cersei. I would not tolerate Cersei in a D&D game. I would absolutely think she would make an excellent PC in something more like Apocalypse World where failure, success with consequences, and PVP are much better accounted for and where there is a less harmonious relationship expected between the PCs.
Third, to a rough glance there are no non-humans in Game of Thrones (when it comes to reading the books, I read the first three back in 2000 but haven't read them since and said I was going to wait for the series to finish...) but that doesn't mean that it's a core part of the setting that there have to be none in a game based on it. Especially a more magical game based on it, and a
Third, to a rough glance there are no non-humans in Game of Thrones (when it comes to reading the books, I read the first three back in 2000 but haven't read them since and said I was going to wait for the series to finish...) but that doesn't mean that it's a core part of the setting that there have to be none in a game based on it. Especially a more magical game based on it, and a game using the D&D rules at that. If someone said "influenced by Game of Thrones" to me I'd assume that this meant that there would be politiciking, death (especially of characters other than Jon, Danny, Arya, and Sansa) would be cheap and it would be dark and full of betrayals. It would not to me say "No Non-Humans Ever" especially when the setting was explicitly more magical than GoT itself an definitely contains people that are about as human as Aragorn (the Dunedain at least in MERP having rules as a race while they would not if there weren't other races involved; the lines are blurry). Also there's the relationship to the wolves and the young Starks doing things others couldn't - which in D&D would be either feat based or race based as I'm pretty sure Jon, Arya, and Sansa are different classes.
D&D rules on the other hand are a strong "non-humans are allowed" pitch (and are far from my first choice for GoT). As such the DM made a bad pitch that did not clearly communicate what they were trying to do. The player gave what was probably a good faith pitch (and honestly there's no reason elves can't be ordinary people, just ones who look odd (most of them really are played that way)). And then in textbook style, according to the DM, both sides dug in in a way that reflects badly on both (I know I do this in message threads) and if there'd been a "a plague on both your houses" option in the poll I'd have taken it.