A list of all the Osa-yukkuris, the regular yukkuris and their current location:
Moriya Shrine: Osa-Kisume, Osa-Cirno, and Osa-Marisa Yukari: Osa-Yukari Akyuu: Osa-Akyuu Marisa: Osa-Patchy Komeijis: Osa-Komeijis Eientei: Osa-Kaguya Momiji, Aya, Nitori: Osa-Hatate and Osa-Aya Kogasa: Acquaintance with Osa-Sanae Tenshi: Osa-Suika Reimu and Suika: Yukkuri-Reimu and Osa-Tenshi Prismriver: Osa-Prismriver Keine and Mokou: Osa-Keine Seirensen: Osa-Byakuren, Osa-Ichimi, and Osa-Nazrin Yuyuko and Youmu: Osa-Youmu and Yukkuri-Ghost Half Hong Meiling: Osa-Sakuya Cirno: Osa-Letty Shiki and Komachi: Osa-Shiki and Osa-Komachi Remilia: Osa-Remilia, Yukkuri-Remilia Patchouli: Osa-China Chen: Osa-Orin Yuuka and Medicine: Osa-Reimu Osa-Suwako: Status Unknown... Osa-Kogasa: Acquaintance with Tani Takeshi
if chaosknight is refering to post #931174, then ya, that's part of tani takeshi's comiket report where they used a osa-kogasa to represent mizuki hitoshi.
