Since it doesn't appear that we have one yet, I'll revamp my Mikado cosplay for the day :] Need some leadership up in dem Dollars, after all.
AX '08 - Honey - Ouran High School Host Club
AX '09 - France - Axis Powers Hetalia
AX '10 - Waka - Okami
AX '11 - Waka redux! - Okami
SacAnime winter '12 - Kida Masaomi - DuRaRaRa!!
Fanime '12 - Chopperman - One Piece
AX '12 - Ryugamine Mikado - DuRaRaRa!!
AX '13 - ko!Ja'far - Sinbad no Bouken/Magi (Days 1, 2 and 4) and Ryugamine Mikado (Day 3)
SacAnime summer '13 - fem!Doflamingo - One Piece - in progress!