Kana Iwata is a young girl known for being the owner of the hamster Oxnard and the best friend of the main human character, Laura Haruna. She is a recurring presence in the human world of the series, often seen alongside Laura as a supportive companion.

In terms of her background, Kana lives with her parents, Cindy and Conrad Iwata. She has a family beyond her immediate household, including an older cousin who owns a farm, and it is this cousin who owns a hamster named Pepper, who becomes Oxnard's love interest. Kana herself is a friendly and artistic girl. She has long, dark brown hair and is typically depicted wearing round glasses. Her artistic talent is a notable ability; she is an outstanding artist who creates detailed paintings and sketches, and her beloved hamster Oxnard is frequently the subject of her work.

Kana's primary role in the story is as Laura's best friend and confidante. Their friendship began on the day Laura moved into town when they met in a small shop after an awkward encounter involving a hamster-themed stationary set. Recognizing a shared deep affection for hamsters, the two girls quickly became inseparable. From that point on, Kana is almost always seen with Laura, supporting her in both leisurely activities and academic pursuits. For instance, she is shown helping and encouraging Laura as she struggles to learn how to ride a unicycle. She also accompanies Laura on various outings, such as a trip to the aquarium with their fathers.

Beyond her relationship with Laura, Kana counts other girls in the neighborhood among her friends, including June, Kylie, and later in the series, Mindy. Her personal motivations are largely centered on her friendships and her art. She also appears to have a subtle romantic interest in Mindy's older brother, Kazuya. Through these connections and her constant presence by Laura's side, Kana Iwata serves as a grounding element in the human narrative, representing a steady, loyal, and creatively minded friend.