I voted for Burgundy, as she is one my favorite parts (or few parts I actually like) of the Black and White Saga. She’s a crazy demon who makes me laugh with her ridiculous antics, and filled the hole in my heart when Team Rocket was changed. Her underdog status draws great sympathy from me as well. She wants to be a better connoisseur and battler than Cilan, who is both a main character and a trainer who doesn’t need plot power to win battles. Her entire love/hate relationship with Cilan is very enjoyable and funny and shippable. She was the first rival character to go through character development and we defiantly see that she is improving, if at least as a battler. Before she would blindly charge forward with super effective moves, but now we see her try out strategy, deceit, and defense as well. I long for the day she battles Cilan again and gives him a run for his money. Why do the writers makes us wait for such a long time to have her grace us with her presence?
tl;dr - I love Burgundy for her funny personality, relationship with her rival, and her development.