Kayo is an elementary girl with shoulder-length brown hair that is tied in two low braids with bangs hanging on the right side and light brown eyes.
Kayo is a quieter and shyer individual than Rie Zenna.
Rie Zenna is always putting her name on her things. Kayo "borrowed" Rie's kimono without her permission, even with the knowledge that Rie wouldn't approve. Eru Chitanda and the others thought that Kayo's hanging kimono was a ghost.
Rie is Kayo's older sister.
Mayaka is Rie's relative.
- The name Kayo means "praise, auspicious" (嘉) (ka) and "generation" (代) (yo).
- Kayo's surname Zenna means "good" (善) (zen) and "name" (名) (na).
- Kayo in the 4th grade.
- Kayo calls Mayaka Ibara "Maya-chan".
- Unlike Rie Zenna, Kayo doesn't write her name on her items.
|Classic Literature Club series and Hyouka featured characters|