Important decisions "what if"

[nietzsche_waifu]

Your characters' lives and fates, and sometimes even the shape of their canons and settings - they often depended on single, important decisions. For events that already happened, you obviously decided on a course of action already (or had the decision made for you if it's an event already established in the canon) - but what if you'd have decided to do something else?

This is a thread for such speculation. If your characters acted differently than they did when given an important IC decision that already happened in the game, what would have changed? How different would they, their canon - hell, maybe even the whole game be?