Anonymous2: Are we sure that this isn't actually Sir Arys Oakheart? I would think that Oberyn (being Arianne's Uncle, as well as a fellow Dorne), would have a similar skintone to her.
Also Arys and Arianne had an affair in the books. She never shared any scenes with her Uncle.
Anonymous7: Anon6(5) it'd probably be easier to say it as common among people with darker skin tones since East Asians are not white but certainly don't fall within the non-white, varying tones categorization you put forth.
And hey, this series is full of incest, a little bit more can't hurt.
"He has thick silver hair that falls to his collar like a silver glacier, divided by a streak of midnight black. His eyes appear black but at closer vantage they are a dark purple - dark and angry."
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Also Arys and Arianne had an affair in the books. She never shared any scenes with her Uncle.
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And hey, this series is full of incest, a little bit more can't hurt.
"He has thick silver hair that falls to his collar like a silver glacier, divided by a streak of midnight black. His eyes appear black but at closer vantage they are a dark purple - dark and angry."