Rena is known to be a very serious, unsociable, strict and stern woman, especially when it comes to teaching her students as she would often punish her students with iron-fist sanctions, but she was also very forgiving and for that (as well as her appearance), she was adored by her students that there was a student fan club dedicated to worship her. According to Itsuki Nakano's words, Rena was "a gentle and maternal female."