Back in season one, one of the things that always made me cringe was reading about this popular characterization of Luna in the fanon. You all know the one; super calculative, has an abacus, calls Celestia "Tia", is very shy and nervous, etc.
It made me nervous about their fics because once Luna was introduced, it'd challenge plenty of their fics' fanonLunas. Using a character that hasn't really been analyzed or revealed by the show is always a dangerous game in that regard.
Then again, it's a total and complete jackplot/timesaver if Luna DOES somehow happen to be exactly like that FanonLuna.
EDIT: Jackplot wasn't intentional, I swear. I'm as surprised as you are.
I'm not changing it though.