Thanks. I'm glad people found the comparison interesting and useful. I don't know whether Buffy will have the longevity of Superman and it likely won't as few modern myths have had that kind of success, but it does, I can see something equivalent to Smallville in 2020, dealing with the origins of Buffy in a different way. Will Willow and Xander remain as canon sidekicks like Jimmy Olsen or would they make up new characters like Smallville did?
Returning to fan fiction, we can see that entire evolution of canon all at once in a single fic on Pens: wiccachicca's Cataclysm Cafe. The interpretations of Willow and Tara within her fic range from that of a batman-like heroine Winna and the cop Taryn to the Two Gay Wicca in the Big Rainbow House, where Willow and Tara are puppets with hair of yarn, Dawn's a ball of light, and Giles is a British mouse. It's interesting to look at this fic to see which elements of Willow and Tara's story and characters are preserved within each story, giving us enough data points to see what wiccachica sees as canon.
As for the division between fan fiction and canon, is a story fan fiction any longer once it becomes canon, i.e. scripts submitted by someone outside the writing team once they're accepted? What is something that was once canon but now isn't any longer?
p.s.: Here's a difficult work to classify: Rosencrantz and Gildenstern are Dead. Is the play a fan fiction of Shakespeare or not? What would it mean if someone wrote a TV show focusing on two minor characters on BtVS, calling it say, Rosenberg and Maclay are Alive? Well, besides them getting sued by Fox.
