I'll start this off with some of my nominations, more may come later
B - Brony - RedStarWarriror
D - Dedicated - Telume, for everything he's done for TPM, and continues to do
F - Facebook Stalker - ChobiChibi, for finding out about Drago's engagement before anyone else
I - IRL - Asi, For organizing our first TPM meetup
M - mrs_pikachu - Becky, Because it had to be done
S - Super - Gavin Luper, for being TPM's newest supermod, and for just generally being super
X - Xtreme Poster - kurai, for all those posts in the post count capsule
! - Ash is a loser! - Gary Oak