I note, with some disappointment, that Cedric is not on the list... (oh well)

In that case, I have two answers.
First, it might be good (well, bad) for the story surrounding Alexander and his possible borderline/unstable psyche for Cassima to get killed. That might just unhinge him completely... (the story possibilities are endless)
Now, who would I
want to die... Thats tougher... Probably Vallanice... She didnt play much of a role in any of the KQ games (save #7, and in that one she shared the lead role with the way cuter Rosella

)