I'll try one for myself... You know you're reading a fic by Vongchild when... You suddenly know who is perfect for Jacen, and it's Nen Yim. It's really AU but it makes twisted sense. You keep kicking yourself and going "Hey, it could happen." The protagonists are, for the most part, nine and ten year old kids with a knack for getting in trouble. Tahiri's family situation is extremely bizarre but you like it. For the really dedicated: You know what a "chosen" is. You know where "Zantares" is.