Bernie Brewer, for the Milwaukee Brewers (6)
I believe the answer is:
mascot
(Other definitions for mascot that I've seen before include "Bringer of good luck to team, etc" , "Thing believed to bring good luck, perhaps to team" , "Good-luck item" , "It's adopted by a team as a symbolic figure" , "It is believed to bring good luck to its owner(s)" .)