MRS KAWAKAMI (川上さん)

Live house manager.

KAWAGUCHI NORIMI (河口紀実)

She is a friend of Sawako's from back when they were in high school, and they were both in the light music club together as part of the band Death Devil. She and Sawako used to try to outdo each other on the guitar. Her stage name is Christina.

TAINAKA SATOSHI (田井中 聡)

Satoshi Tainaka is Ritsu Tainaka's younger brother. He appears when Ritsu is walking home with him from the movies. He then ventures of with a friend from school he saw on the way home. He seems to respect his sister Ritsu but still acts like a normal boy.

SOKABE MEGUMI (曽我部 恵)

Megumi was the president of the student council before Nodoka succeeds her in her third year, and she is also the president of Mio's fan club. She stalks Mio during her last few days in high school because she wanted to see Mio one more time. The band offers her a song as a graduation gift. She can be seen in episodes seven and eleven of the anime.

SUZUKI JUN (鈴木 純)

Jun is Azusa's and Ui's classmate who often hangs out with the latter. Ui tries to get her to join the light music club but ultimately fails due to a strange visit to the club room. However, she starts to regret it when she hears about all the activities the club does. She has a pet cat.

MANABE NODOKA (真鍋 和)

Birthday: December 26
Sign: Capricorn
Height: 158cm
Weight: 52kg
Blood type: A

Nodoka is Yui's childhood friend and confidant who is a member of the school's student council. As a normal, well-mannered and intelligent girl, she is generally taken aback by the light music club's odd behavior, and easily gets annoyed with Ritsu whenever she forgets to fill in the club's application forms. She shares the same class as Mio in their second year, who appreciates her companionship tremendously, as being the only person Mio knows in her class. In her third year, she becomes the student council president.

HIRASAWA UI (平沢 憂)

Birthday: February 22
Sign: Pisces
Height: 154cm
Weight: 50kg
Blood type: O

Ui is Yui's younger sister, who begins the story as a third-year junior high school student, but later enters Yui's high school the following year in the same class as Azusa. Unlike her older sister, Ui is mature, responsible and handles household chores well, though she still shares a strong relationship with Yui and has a great deal of love and respect for her older sister. Despite being a year younger than Yui, she is nearly identical to her with her hair down and is even once able to fool the club. She possesses some of her sister's musical gift, and has a great talent for playing the guitar—she became capable of playing with the rest of the light music club band after only a few days of practice (Yui was sick, so Ui dressed up as Yui to help the band out). She takes particularly good care of Yui and strives to look after her even at the risk of her own health. Ui is actually considered as the ultimate groupie for her sister's band and supports them with all her heart. She occasionally provides a narrative to the story. She is in the same class as Azusa and hangs out with her sometimes.

YAMANAKA SAWAKO (山中 さわ子)

Birthday: January 31
Sign: Aquarius
Height: 165cm
Weight: 56kg
Blood type: B

Sawako is the adviser for the wind instrument club at Yui's school. An alumna of the school and a former member of the light music club, she does not want people to know she was formerly a member of a heavy metal band, thus she covers up by being mild and gentle to her co-workers and especially to students. She is forced to be the adviser of the light music club, as Ritsu blackmails her after the girls learn of her past, though it is unknown whether she stopped being the adviser for the wind instrument club as the story progresses. Though she has a mature and gentle demeanor in the school, Sawako, affectionately addressed as "Sawa-chan" by both Ritsu and Yui, displays a totally different, completely authentic character when she is alone with the light music club. In reality, she is a rather wild, lazy and quite an irresponsible teacher who enjoys dressing up the light music club in, sometimes embarrassing, cosplay costumes, much to the dislike of Mio. She names the club band ''After School Tea Time'' after the members take too long deciding on a name themselves, and to maintain the secrecy on her heavy-metal image. She once momentarily pitches in for Yui with her Gibson Flying V electric guitar.

NAKANO AZUSA (中野 梓)

Birthday: November 11
Sign: Scorpio
Height: 150cm
Weight: 46kg
Blood type: AB

Azusa is a new student who joins the light music club and plays a Fender Mustang electric guitar but she is also in possession of a Gibson Les Paul Custom 50th Anniversary Gold Top (as seen in episode 13). A self-proclaimed novice guitarist who has been playing the guitar since the fourth grade and whose parents are working in a jazz band. She is in the same year and class as Ui and has quite a mysterious demeanor. She often finds herself bewildered by the tea parties and cosplaying aspects of the club, when she would rather just practice and is curious on how the club is able to play so well despite their problems and lack of practice. However, she has a certain weakness for cakes and can be calmed down rather easily, sometimes by just being petted. She could be described in part as a tsundere. She is constantly hugged by Yui and is nicknamed Azu-nyan after trying on a pair of cat ears and meowing. In the band, she looks up to Mio the most due to her maturity and the fact that she is an experienced bassist. Since joining, Yui comes to her for advice on playing guitar, as well as maintenance.