I thought of Elaine as a viable candidate, after posting. I don't know, it could work. Two wizards and all. I like Elaine. Kind of another person who shouldn't get too near the Denarians though, not so much for the temptation angle as that they might really like torturing her. Ebenezar is conceivable, although that would mean a full book of his various accents and I don't think we can handle that kind of stress. Plus, another dude that might freak out about, "you wanna help the forces of darkness steal what from who?" Can't beat having the magical murderstaff suck out their life-forces for power and simplicity though.
...huh.
EDIT (after eight seconds of Googling):
Found this. Welp, unless this changes... man, I was really enjoying the quasi-baseless speculation there for a minute. Guess this is why people avoid spoilers.