From Do: Pilgrims of the Flying TemplePilgrims get into trouble.
One sentence, four words. You're not supposed to protect your Pilgrim. She's not supposed to be a boring, flawless hero. She is going to get into trouble. You will be lead to your Pilgrim's weakness again and again, and that's a good thing!
Every game needs a rule like this. (The first sentence of Call of Cthulhu
should be "The object of this game is to drive your character's sanity to 0." There, I fixed it for you!) Games like D&D or Vampire, where getting your character killed really does reduce your ability to contribute to the fiction (rules as written), are fundamentally broken as potential literatures, because they incentivize players to "protect" characters, "advocating" for them. D&D is a set of rules for making short, bearded Mary Sues. Vampire is a set of rules for making Mary Sues with heavy eye makeup.
I don't know if this even merits a discussion. I specifically avoided posting in the "Character Monogamy: Does it Suck" thread, to avoid giving the appearance of trolling, but here you go. Character monogamy: Does it lead to Mary Sueism? Some say it is so.
That is all. </rant>. Bonus points if you can figure out how to fix a game for us in this way.