The Dark Knight is an interesting character to say the least. He doesn't exactly fit with the rest of the roles, but he is an important character in the game. You'll see his role when the game comes out, I'd like to have a deeper voice for this one, although it is not required. 

This role has only one actual spoken line, but part of it will be used to make the text dialogue voice, like the one(s) in Undertale.