- Her name, "Koushi", means young cow in Japanese terms.
- She shares the theme: "Popular Street Musicians ~ Incorrupt Tunes" with Usagi. Fuan Satsujin and Hitori, Sutorei and Aruku, Susanoo no Mikoto and Fujin Kaze, and Hagane Zero & Pupa-Chan share different themes too.
- Koushi and Usagi share the same ability (make sounds and perform on her own) and occupation (play music in the village). Taeko Yuhara and Kaoru Fumetsu share the same occupation: "drink blood".