Jun Suzuki (鈴木 純 Suzuki Jun) is Azusa's and Ui's classmate who often hangs out with the latter. Jun is generally a playful and easygoing girl, but she is sometimes rude without realizing it, which Azusa usually tries to correct her on. Ui tries to get Jun to join the light music club but ultimately fails due to a strange visit to the club room. Instead, Jun joins the jazz club because of a cool upperclassman. However, she starts to regret it when she hears about all the activities the light music club does. Jun plays a bass in the jazz club and has admitted to admiring Mio. Jun once asked Azusa to look after her kitten, though Azusa only agreed because no one else could. Jun joins the light music club in the end of the series.
She shares her name with the current bassist for The Pillows, Jun Suzuki, though spelled with different characters.