Master Vizard, The Masked Whale

You're a masked assassin whose aunt was eaten by a crazy member of a different faction, and when you find out which faction was responsible there will be hell to pay - the memory of it makes you shriek even as you plot revenge. It was the loss of your aunt that turned you into an assassin and what drives you on today. The Commonwealth of the Arachnid Queen are after you because you set ablaze all their beer.