Chi is the central character of this anime, a small and energetic kitten whose adventures drive the story forward. Her background begins when she wanders away from her mother during one of her first excursions and becomes lost. She is subsequently discovered and taken in by the Yamada family, who provide her with a home. The story of this specific series follows the family’s decision to move to a new apartment building that explicitly welcomes pets, allowing Chi significantly more freedom to explore than she had previously. This new environment serves as the primary stage for her experiences.

Chi’s personality is defined by a powerful and endearing combination of traits common to a very young animal. She is overwhelmingly curious, finding fascination in the most mundane objects and daily occurrences. This curiosity fuels her playful and adventurous nature, as she is constantly driven to investigate every corner of her world, from the family's new apartment to the surrounding streets and park. Her perspective is naive, which leads her into various forms of mischief, as she does not yet understand the consequences of her actions, such as breaking household items or wandering into unsafe situations. Despite her small size and a tendency to cause minor chaos, she is not malicious. Her attitude can be described as cheeky or bold, showing a confidence that belies her vulnerability. Her emotions are typically simple and transparent, often cycling between a state of neutral contentment and overt happiness, though her antics can also lead to confusion or brief frustration.

Chi’s primary motivation is the sheer joy of exploration and play. Every new sight, sound, or creature is an opportunity for an adventure. She is not driven by complex goals but by an immediate, instinctual need to understand and interact with her environment. This often translates into chasing insects, investigating strange objects, or approaching other animals without fear, driven by a desire for fun and engagement.

In the story, Chi serves as the dynamic lens through which the audience experiences the world. Her role is to interact with her human family, the other residents of the apartment complex, and the local animal society, thereby creating episodic narratives. Her actions, whether befriending a shy child or antagonizing a flustered parrot, are the catalyst for the gentle conflicts and heartwarming resolutions that make up the series. She is the thread that connects the various characters, from her owners to the stray cats she meets.

Her key relationships form the emotional core of the narrative. The most important is with the Yamada family, who are unnamed in most sources but referred to as Mama, Papa, and the young boy Yohei. They are her protectors and providers, and her interactions with them showcase the bond between a pet and its owners. Chi also develops a rich social life among the animals. She befriends a fluffy cat named Alice, a dog named David who she initially fears but later adores, and a parakeet named Lucky who has the unique ability to mimic Chi’s meows in a way that humans can understand. Perhaps her most significant relationship outside the home is with a street-smart cat named Tama, who takes on a mentor-like role, attempting to teach Chi the rules of the outside world. Chi’s innocent charm also affects the humans she encounters, such as the pet store owner who becomes obsessed with her and Yohei’s friend Ryu, who overcomes a fear of cats because of her.

Throughout the series, Chi shows a noticeable development in her social world. Initially confined largely to her family's home, she expands her horizons in the new apartment complex, gaining confidence as she explores the neighborhood. She learns from her interactions with other animals, even if she does not always apply the lessons. A notable moment of growth occurs when she demonstrates forgiveness after the dog David accidentally destroys her favorite toy, accepting his offer to share his milk instead. While she remains a fundamentally playful and occasionally reckless kitten, her experiences allow her to build a network of friends and a deeper, albeit still simple, understanding of the world around her.

For a kitten her size, Chi possesses several notable abilities. Her most prominent traits are her endless energy and agility, which allow her to climb, run, and squeeze into tight spaces with ease. She has a remarkable capacity for getting into and out of trouble, often saved by her own quick movements or the intervention of others. While the animals in this world communicate with each other in their own way, Chi’s ability to charm is her most powerful tool, as she inadvertently wins over nearly every character she meets, from grumpy old cats to fearful children. Her actions, while simple, often lead to complex social outcomes, demonstrating an ability to unintentionally bridge gaps between different groups within her community.