Thanks for the tip! Now what would be a good name for it, if I ever decide to do it?
It all depends on the delivery. The main problem is, at the end of the day, Leaf is a main character, which is where she differs from Blue, so if the point of the story is "Oh look it's Leaf instead of Red", it probably won't be a very interesting story, but if you think you can tell it in a way that is unique and really adds something to the original story, I say go for it! And even if you are in doubt over whether you can do that, go for it anyway, it never hurts to try, post a link to it here or put it in your sig and I'll be sure to have a look at it if you do decide to write it. Best of luck!