This is a tough choice - so many worthy contenders but I have to vote for Ville (Labamba). He's very competitive, determined to win and plays one of the best tactical games in TT, but is always very fair and gracious in defeat
He has done a lot of work in making the game what it is and is always willing to listen to other points of view and will compromise his opinions for the good of the game, but only after arguing his point in a clear and concise manner. He never badmouths, slags off any other players or resorts to name calling. He's also not afraid of making the hard decisions. He has co-ordinated a lot of the discussions on the rules and changes and has amazing foresight for the long term future of the game
Special mention also goes to Isa (LaTenista), Dana (scythe19pro) and Peggy (Bjorki) who are always quick to congratulate their opponents
Of course, most players do as well but those 3 stick out in my mind.