Shiina is a ninja and is able to sense when danger is coming. Despite her dark and mysterious demeanor,  she has a weakness for cute stuff such as animals. She is strict and serious and is very self-critical when she fails. She decides that her weakness is poor concentration. She doesn't speak often but when she does it's usually remarks such as "how shallow-minded" or "how foolish" (this is so stupid, things like that). She fights with dual Koadachi & Shuriken.