Kako has tanned skin. His eyes are a blue-green shade in the shorts and in the first thirteen full-length episodes. From "Video!" until the series finale, his eyes are a lighter green. The character wears a red cap in the full-length episodes.
Kako loves spending time with his best friend, Oobi. He is shown to be excitable and somewhat arrogant. Kako's catchphrase is "¡Perfecto!" (meaning "perfect" in Spanish).
- Kako is visible in many family photos at Oobi's house, despite not being part of the family.
- The "About the Author" section of Noel MacNeal's arts-and-crafts book Box! mentions Kako.