Solution:In Commedia Dell'arte, a form of Italian theatre characterized by masked types, the stock characters of "Masters" include Pantalone, Dottore, and Capitano. Pantalone is a miserly old man, Dottore is a pedantic scholar, and Capitano is a boastful and cowardly soldier.
Columbine, on the other hand, is not a "Master" but a "Servant" or "Zanni" character, often portrayed as a clever and resourceful maid who aids the lovers. Therefore, Columbine is the character that does not belong to the category of "Masters."