If I were to start a sports team then the colors of the team would be black and white like a chessboard and the chess pieces as it shows they are stark contrasts of each other to reflect the duality of the game, both offense and defense as every player on the team has to be able to play both sides. As far as the mascot goes I would pick a pawn as even the least powerful piece still has enough power to be positioned to put the king in check and win the game.