Kei Shikina is a supporting character in the series Hybrid × Heart Magias Academy Ataraxia. Kei seems to have a calm and studious personality. She is also very hardworking and intelligent. Thanks to that she is the chief of Nayuta lab. Due to being very shy or just from her hobby she not speak her usual voice and using keyboard which using to communication with others except Reiri.
- She becomes jealous that Reiri spends so much time with Kizuna, rather than with her.
- Kei has strong feelings for Reiri.
- Kei secretly records Reiri and Kizuna when they were doing Estacy Hybrid, claiming that it is just for research.
- While rarely seen, she has expressed multiple time to have a interest in observing when Kizuna does Heart Hybrid with Reiri doing Ecstasy Hybrid.