Rikka is a reserved and mature young woman who can be a little snarky and act aloof occasionally, but otherwise she is a kind, friendly and empathetic person who cares for her friends as shown through helping the amnesiac Yuta and saddened by the death of Tonkawa and the others despite barely knowing anything about them. She also offered assistance to total strangers such as Anti and has a more carefree side through skipping the school without bothering to contact her friends.