The Reaper is teen agnst incarnate, and when he activate his ultimate, he start shouting "die! die! die!" on that Batman voice which is SO corny I think the enemy dies of embarassement.

Oh, and I got into the beta and been enjoying it so far, but I feel some characters may be a bit umbalanced right now... but take my opinion with a grain of salt since I don't know how to play all characters yet.