Found this excellent piece on Electric Children on the subject of (specifically comic book) creators who have spoken of fictional characters as being in some sense real – and those who have met them.
The classic example is Alan Moore’s oft-told story of having met his creation John Constantine – twice. The article doesn’t accurately quote the one thing Constantine told Moore (on their second meeting), which in the unexpurgated version goes like this:
Any cunt can do it.”
Long – but do read it.