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Regarding Agrail – he isn't a demon at all, or maybe he's half-demon.
Somewhere there's a story about a warrior (supposedly a human, possibly an elf) who was either a traitor or something else. Anyway, when he was lying there, battered and dying after a battle, Kha-Beleth came to him and took him away.
(If I find it again, I'll post the link.)
I immediately thought that this was Agrail.
