Mitsuru is calm, confident, mature, responsible, wise and very intelligent despite being a high school student. However, she may be interpreted as slightly arrogant, conceited, cold-hearted or overconfident. As events unfold, this may be a front of maturity, due to her assumed role as the leader of SEES.

Her sheltered upbringing and wild imagination often cause misunderstandings. One example occurs during a video recording, in which she believes Junpei's room has been ransacked due to how messy it is. After calling over Officer Kurosawa to investigate, she is surprised and embarrassed when Junpei arrives and explains that his room "always looks like this."