She has an ambiguous yet upbeat personality, but often has trouble remembering important club activities and announcements. She gets constantly yelled at, and whacked, by Mio after forgetting to send in important forms concerning the club even though often reminded by Nodoka . Ritsu is cheerful, often likes making jokes and is sarcastic most of the time. She usually brainstorms for ideas to earn more money and for the club’s success (sometimes claimed as evil deeds by her friends). She has developed a certain endurance against Mio's hits, since she was little, as she often teases Mio whenever Mio is cowering from something and she has the opportunity to do so. Ritsu is always on the go, and will stop at nothing for the success of the light music club even when everyone else gives up. She is the source of fun and encouragement of their band.

However, from time to time Ritsu has been a lazy character as well. When it comes to practicing, she only thinks of having fun with her band mates (such as having tea breaks that almost drove Azusa away). During training camps, Ritsu usually votes to play first the moment they arrive and is often supported by Yui. She often needs Mio's help in studying but she gets good marks in her tests. When she becomes determined, she can get her work done in no time. Such determination can be seen on her goal towardsBudokan as well. She has a strong sense of confidence from an unknown source, although her confidence has often lead to the club's despair, such as when losing their way in the middle of Kyoto. Ritsu has a tough front, and would not cry easily. Her weak spot is seeing her friends cry and she would do anything to cheer them up.