Koharu is a shy girl who likes idols, but is too shy to tell people. She has a form for each of the idol types.
- Koharu (Natural)
- Kokoro (Lovely)
- Komina (Pop)
- Ko-Li (Cool)
- Kolice (Premium)
- Koshima (Celeb)
Koharu is shy and pensive. She loves gardening and writing songs. She serves as the Vocalist for Ko-Unit.
Kokoro is outgoing and fun loving. She likes making accessories. She is the main Pianist for Ko-Unit.