Hanako is a white-furred Kishu dog known for her energetic nature. She acts as Mametarou's girlfriend and love interest. Her personality is distinctly cloudcuckoolander, making her easily distracted and oblivious to her surroundings; she frequently fixates on minor things like passing insects or objects.

A defining passion is her intense enthusiasm for melon pan, driven by a firm but mistaken belief it contains actual melon. This craving often leads her to become singularly focused on acquiring the treat. Physically, she exhibits accidental roughness, frequently knocking over other characters during her exuberant movements despite having no ill will.

Within the dog cast, Hanako regularly interacts with characters such as Sora the dachshund and Sebastian the Yorkshire Terrier. Her romance with protagonist Mametarou includes moments where she voices anxiety over potential shared lineage, expressing concern they might be half-siblings due to unknown parentage despite their obvious breed differences, creating lighthearted tension.

Her background beyond being a purebred Kishu remains undefined. She maintains consistent personality traits and behaviors across both seasons of the series, showing no significant development or alteration to her core attributes.