The death of characters, disappearances, unexplained disappearances specficially, but nonetheless the game is still and forever will be a + for me.
Poor ZWEI. In his first game, he gets only a bit role and falls into the abyss of wherever MIA characters go.
I know. I thought he was cool. Knowing Namco, in Soul Calibur VI, there will probably be a tale of his narrow escape with the help of E.I.N or something.