Yes, think of the elves made thralls by Morgoth in the mines of Angband. For example, Gwindor, a Noldo, was a slave in Angband for fourteen years, where the strength and beauty of his body was ruined. He also lost a hand.
This isn't the Lord of the Rings.
"This"?
It wasn't the best part of XGTE, but I do like those name charts.
As for the looks of the Shadar Kai, do what I do, ignore the bits that you don't like. I might have my shadar kai appear as shadowy versions of themselves while in the shadowfell, they wear masks because that ties their lifeforce to a physical form, without them, they are danger of fading into the shadowfell.
D&D 5e.
It's fantasy fiction about elves, isn't it?