She wears a star on her hat that is similar to Hong Meiling's one, but without a symbol.
Her last name Miyako (宮古) literally means "Ancient Palace". Her first name Yoshika (芳香) could mean "Fragrant Incense".
She is the only character in the series who can heal herself during battle.
Yoshika and Seiga's relationship was likely caused by the story Strange Stories from a Chinese Studio. This is a possibility because the inspiration for both characters appear in the story and there is a story, "dead body incident" (simplified Chinese: 尸变; traditional Chinese: 屍變), in the 3rd chapter of the 1st volume.
Yoshika's model is Miyako no Yoshika, a poet of Heian period. Yoshika was jealous of Sugawara no Michizane, a renowned politician because he got promoted and took higher position than Yoshika. Yoshika, driven by jealousy, resigned as a royal poet and retired to hermitage. According to legends, after 100 years from his resignation, a man met Yoshika in a cave, alive and looks like a healthy young man.