Bad news; you've just died.
Good news; you have been granted the gift of reincarnation. And not any kind of reincarnation; you can choose any fictional character whose life you wish to take over.
You'll take take their lives around the same time they were first introduced, and you get to keep all your knowledge of your previous existence, which means you might also know plenty of things about the new life you have just walked into.
Who did you choose and what do you do from that point onward?