In your opinion, which hero has the most charisma in the campaign?

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.