I voted for Samantha Ferris because she (at least seen from watching Ellen) has such a strong personality that I think she'd be great for DeathKnell. But if you're asking for other candidates, I thought the actress who played Meg was pretty kick-ass. It kind of depends on the type of character you're casting, I guess.

BTW, the thought of more DeathKnell makes me very, very happy. *g*