@mvpBLAZEup,
Each Boss Hunt features a set of hats for a specific character class; for "A Banquet for Sasquatch" it was Peashooters, for "Tale of the Spooky Squash" it was Scientists and so on.
Regardless of what character you play everyone earns the same prize for whatever character class is associated with the Hunt; if you played a Citron in "Banquet" you still got a Peashooter hat, if you played an All Star in "Spooky Squash" you still got a Scientist hat and once you had the set all you received from there onward are coins.