Momo is a supporting character in the anime Ultra Nyan: Hoshizora Kara Maiorita Fushigi Neko and its sequel, Ultra Nyan 2: Happy Daisakusen. She is a pink Persian cat distinguished by a purple bow, making her easily recognizable among the neighborhood cats. Momo’s personality is defined by her affectionate and somewhat flirtatious nature, particularly toward the titular character, Nyan. She often tries to gain his attention through playful advances, which typically results in embarrassment and mild annoyance for Nyan.

In the story, Momo is one of the local cats that Haruka, the human protagonist, knows. She occupies a supportive role, joining the group of cats—including the elderly Professor, the calico mother Anko, and the Siamese Kosuke—that interact with Haruka and assist in the events of the film. Her primary motivation centers on her crush on Nyan, and her actions often reflect a desire to be close to him, though she also participates in the collective efforts to help foil the plans of catnappers.

Momo’s relationship with Nyan is the most notable aspect of her character. While Nyan is focused on his mission from space to restore happy energy and protect cats, Momo’s romantic interest introduces a lighthearted, comedic element to their interactions. She does not undergo significant development across the two films, remaining a cheerful and persistent admirer throughout. No special abilities beyond ordinary cat traits are highlighted for Momo; her prominence comes from her distinctive appearance and her role as a recurring feline companion.