Kinako Monaka, the niece of Iori Monaka, lives with him for undisclosed reasons, her parents absent from view despite suggestions of shared residence. She embodies a lively, self-reliant, and tomboyish spirit, often diving into adventures with a competitive edge and strong aversion to defeat. Her sharp observation skills and driven personality stand in contrast to Iori's laid-back nature. Kinako experiences neglect when Iori shifts focus to Anzuko Domyoji, sparking loneliness, though she maintains a deep connection with her uncle overall. Her dynamic with Geppei Okaki evolves significantly: once rivals battling for neighborhood dominance—like their clash over a hidden lawn patch in Episode 3—they become close allies in shared exploits. Episodes subtly indicate Kinako's romantic interest in Geppei, revealed through flustered reactions to his presence. Through Iori’s ownership of Taruto, Kinako engages indirectly with cat care, interacting familiarly with Gallette (Geppei’s pet), Nachos, and Chips. Her compassion emerges when aiding the cat Mousse Kabekawa to reunite with an elderly woman tied to her family. Kinako’s traits include a fondness for cleaning and sharing, complementing her competitive drive.