Raised in the same village as Yoshika, Michiko (called Micchan by her friends) attended Yokosuka 4th Girls-only Middle School alongside her. She sometimes brings Yoshika wounded animals to heal at the Miyafuji clinic, and has been healed by Yoshika's magic once herself.
Micchan's favorite warship of the Imperial Fusoan Navy is the Takao, of the Takao-class heavy cruisers.
- Strike Witches season 1
- Strike Witches season 2
- Strike Witches Movie
- Strike Witches: 501 Butai Hasshin Shimasu!
- Strike Witches: 501 Butai Hasshin Shimasu! Movie
- Tenkū no Otome-tachi
- Strike witches: Chii Sanya, cameo in chapter 4
- Strike witches: Chii Size
- Strike Witches: The 501st Joint Fighter Wing
- Strike Witches: 501 Butai Hasshin Shimasu! Movie (manga)
- Strike Witches: Kiseki no Rondo, in a group card
- The name Michiko means "beautiful" (美) (mi), "wisdom, intellect" (智) (chi) and "child" (子) (ko).
- Michiko's surname Yamakawa means 山 (yama) meaning "mountain" () (yama) and "river" (川 or 河) (kawa).
- While not a witch canonically, she did receive a mockup as one by Humikane.