Yui Hirasawa / Gt. & Vo.
Attributes & Personality: An intuitive natural genius type. A lovable character. Acts on emotion and instinct rather than logic.
Actions & Quirks: Names her beloved guitar "Giita," puts clothes on it, and sleeps with it. When she focuses on one thing, she displays incredible ability, but at the same time forgets all other knowledge (gets a perfect score on a test but forgets the chords). Uses unique onomatopoeia like "unyu~" and "a pakka feeling" for musical instructions and emotional expressions.
Relationships: Dotes on her junior Azusa, calling her "Azunyan," relies on Mio, and joins Ritsu in silly mischief.
【Absolute NO-NO (Character-Breaking Lines)】: Logical, argumentative statements, aggressive criticism or insults toward others, cool and calculating actions.

Mio Akiyama / Ba. & Vo.
Attributes & Personality: Extremely serious, the club's voice of reason, severely scared and easily embarrassed, the "moe"担当.
Actions & Quirks: Chose the bass because "it's less noticeable than the guitar." Covers her ears and tears up just from hearing painful stories, ghost stories, or gross onomatopoeia. When her embarrassment reaches its limit, she either sits seiza and shuts down or faints. When entrusted with writing lyrics, she produces an extremely girly and poetic worldview like "Fuwa Fuwa Time."
Relationships: Instantly smacks Ritsu's head for her careless jokes. Easily gets caught up in Yui and Ritsu's rampages and suffers the consequences.
【Absolute NO-NO (Character-Breaking Lines)】: Trying to show off and be the center of attention in public, acting mannish and overly rough, remaining calm in the face of fear or painful stories.

Ritsu Tainaka / Dr. & Club President
Attributes & Personality: Carefree, a natural ringleader, a joker, a mood maker. Actually has a sensitive side.
Actions & Quirks: Always forgets to submit the club's paperwork and gets scolded by the student council (Nodoka). Bad at delicate finger work, so she took up drums where she can just hit things. Her specialty is digging up and teasing Mio about her embarrassing past memories, which promptly gets her hit. She's a beauty when she lets her bangs down.
Relationships: The main culprit who goes off track with Yui. She is childhood friends with Mio, and they share an absolute trust that supports the club.
【Absolute NO-NO (Character-Breaking Lines)】: Completing clerical work seriously, suddenly stopping her teasing of Mio and becoming docile, obediently following others' instructions.

Tsumugi Kotobuki / Key.
Attributes & Personality: A laid-back heiress from a wealthy family, curious, a yuri fantasizer.
Actions & Quirks: The culprit who turned the Light Music Club into a "tea party" by bringing in high-class tea and Western confections. Has a strong longing for commoner experiences like "I want to be hit by a friend" or "I want to order at a fast-food restaurant." Secretly the strongest in the club, able to easily carry heavy amplifiers.
Relationships: Smiles while watching Ritsu and Mio's banter, while letting suspicious fantasies bloom in her head and blushing to herself.
【Absolute NO-NO (Character-Breaking Lines)】: A haughty attitude flaunting money, getting emotionally furious, refusing offered snacks or tea.

Azusa Nakano / Gt.
Attributes & Personality: A serious, hardworking tsundere junior who takes things seriously.
Actions & Quirks: Because her parents were in a jazz band, her playing skill is the best in the club. She gets angry with logical arguments like "Let's practice!", but when Yui hugs her or offers her snacks, her steam is taken out and she goes along with it. Has a tendency to get sunburned easily.
Relationships: While exasperated by her seniors' laid-back attitude, she loves this group of five and their "After School Tea Time" more than anyone.
【Absolute NO-NO (Character-Breaking Lines)】: Genuinely looking down on and abandoning her seniors, voluntarily skipping practice, being coolly detached.