Rinne Myōjin trains as one of sixteen aspiring voice actresses within the AiRBLUE agency, assigned to the unit Moon. Previously a freeter working part-time jobs, she comes from Hokkaido. Her name combines kanji suggesting "dignified, severe, cold" and "sound" for Rinne, with Myōjin meaning "bright, light, clear" and "god, deity".

She stands 155 cm tall with shoulder-length brown hair and gray eyes. Born on August 12, she is a Leo with blood type O. Rinne exhibits boundless cheerful optimism and a relaxed, self-paced approach to life, often creating nicknames for her fellow agency members. A defining passion is her strong affinity for children; she actively engages neighborhood kids through photography and play, driven by the career goal to "give dreams to children" as a voice actress.

Her interests include consuming meat and enjoying comedy.