As much as I truly love James and Lily Potter, to the point where I had a little metal keychain in the shape of two joined hearts inscribed with their names for several years (I made it in class in 2005 or 2006; I cut and buffed and polished it myself :D) before it, sadly, got lost in school last year, they were not the ones I was thinking of. Mysti guessed it with Luna. XD However, I'm beginning to think I should add them. >_>

Again, nope! Though I can certainly see why you would think of Sister Mary. I'll give you a hint; one of the two is a character I had considered playing at LTSH. I remember discussing the possibility with you.