Ella Kii Krause is a first-grade elementary school student and a neighbor to the character Fuji. She is a young girl of mixed cultural heritage, with a Japanese father and a German mother. This background contributes to her multicultural home environment and perspective. She attends an international school, which further encourages her open-minded and adaptable nature.

In terms of personality, Kii is consistently described as being well-mannered, polite, and thoughtful. Her most defining trait is a strong and eager curiosity about the world around her. She is gentle, warm-hearted, and friendly, which makes her easy to get along with and allows her to form connections quickly.

Kii's primary role in the story is as a friendly neighbor to Fuji, and she is always enthusiastic about learning new things from her. Her curiosity naturally extends to the dog Kimi, whom she is fascinated by and wishes to know more about. A significant part of her daily life involves caring for her own beloved pet, a dog named Kinako.

Regarding her relationships, Kii shares a close bond with her next-door neighbor, Fuji, and the two share many daily moments and discoveries together. Her family, which embraces both Japanese and German traditions, is supportive of her explorations. Her love for her dog Kinako is a fundamental part of her life, and this connection also fuels her interest in Kimi.

Information on her development throughout the series is not available. Specific motivations beyond her inherent curiosity and desire to learn are not documented. Defined notable abilities are also not detailed in available sources.