Oh ye gods yes, I used to fall in love with all sorts of characters as a kid - perhaps most notably Chrestomanci, about whom I am completely irrational. The most recent example is the Inkheart trilogy, which I got a bit obsessed with. I *cannot* read fanfic about it and I probably won't even see the next two films, just out of a sense of you don't get to touch that.

The more I get into larping the more this happens to me there, too. On Monday I caught myself getting really quite upset because it looked like everything was about to go horribly wrong for my favourite PC. It's not even only about my own characters - there are a few other people's PCs who can cause the same reaction.