Monaca is seemingly very amiable and caring. She appears very cheerful and has a childish way of talking, sometimes meowing and almost exclusively referring to herself in the third person.

Because of her charming personality, all of the Warriors love her and try their best to keep her happy and go along with what she wants. However, it's slowly revealed that she is much more manipulative and cunning than she lets on. Her 'true' personality resembles that of Junko's. She is also mentioned to be very intelligent for her age and very skilled with robots.