Montine, an anthropomorphic flying squirrel with rosy cheeks and distinctive hair ribbons, forms the Momonga sibling duo with Monga. Her actions are perpetually driven by an insatiable hunger, leading to comedic schemes to obtain food. This motivation propels the siblings into conflicts, such as attempting to devour Kitty and Mimmy's Candy House, an act which inadvertently sends the twins into the Twisted Forest and Parallel Town.

Susceptible to food-based bribes, Montine and Monga are frequently recruited by antagonists. They accept tasks from the villainous Akuro, including spraying Kitty with black paint and participating in a magic spell during a solar eclipse to aid Akuro's goal of turning the world black. These alliances stem purely from opportunistic hunger, not inherent malice.

A significant shift occurs when Montine and Monga remain in Parallel Town after Kitty and Mimmy depart. Leveraging their culinary experiences, they establish a successful restaurant specializing in octopus meatballs. This venture leads to their deliberate choice to stay in Parallel Town indefinitely, abandoning their previous disruptive behaviors tied to food scarcity.

Physically, Montine possesses species traits like flight via membrane wings and anthropomorphic features, including expressive facial characteristics. Her visual identity is marked by her hair ribbons.