Hiyoko has dirty brown hair tied up in two braids, dark red eyes and two tiny fangs (although they are never both visible at the same time).
Hiyoko seems to be mostly cheerful and recently got hooked on collecting pink things.
- The name Hiyoko means "sun, day" (日) (hi), "harmony, peace" (和) (yo) and "child" (子) (ko).
- Hiyoko's surname Ueda means "planting" (植) (ue) and "field, rice paddy" (田) (ta/da).
- Hiyoko slightly changes how she braids her hair every day.
- Hiyoko has earned the nickname "Fang-chan".
|Kitauji High School Concert Band during Kumiko Oumae's first year|
|Note: Section leaders are shown in bold text
1Rejoined the band
2Left the band
3Also in charge of the Tuba and Double Bass sections
|Kitauji High School Concert Band during Kumiko Oumae's second year|
|Note: Section leaders are shown in bold text|