Yoshiko seems to be a chuunibyou, a person who holds delusions of grandeur. Bright, self-assured, smart, and thoughtful, Yoshiko has a persona who she describes as "Yohane", a "fallen angel" who has angered God and was cast from the heavens to Earth. Apparently, a side effect to being a "fallen angel" is that she is cursed with extremely bad luck, running into all kinds of unforeseen trouble wherever she goes: raining whenever she goes on trips, falling whenever it snows, not winning anything from lucky draws in convenience stores, falling sick right before exams, and so on. Because of this, she often blames herself for Aqours' misfortunes. Through her delusional persona, Yoshiko acts dramatic, cunning, and a little bit devious, and often goes as far as using dark, devilish accessories or clothing to further accentuate her "fallen angel" look as "Yohane". When acting like her, Yoshiko's voice is significantly lower-pitched.