As from Commentary! The Musical.
I have managed to work my Carmen character, Lilas Pastia, from background character to the major force for all the unpleasantness in the opera. Before, I was simply the tavern-keeper and Carmen's pimp, the stock character of the crooked tavern-keeper cut from the same cloth as Les Miserable's Thenardier. Now, I push Zuniga (Don Jose's commander) onto Dom, Jose's knife, and blame him for it. In the next act, when we fight and he kills me in a fit of vengeance, my death has become the defining break between him and Carmen.
So the spiral of operatic death in this production of Carmen is all my character's fault. Not bad for someone who doesn't sing, and basically came in as a bit part.