K-ON! Wiki

Tsumugi Kotobuki name icon.png
Yui Icon.png Mio Icon.png Tsumugi Icon.png Ritsu Icon.png Azusa Icon.png

Tsumugi Kotobuki
First Appearance
Manga Debut Volume 1, Chapter 0
Anime Debut Season 1, Episode 1: Disband the Club!
Other Appearances
Videogames K-ON!! Ho-Kago Live!
Stages K-ON!! Let's Go! Live
Movies K-ON! Movie
Voice Provider
Japanese Minako Kotobuki
English Shelby Lindley
Korean Hyeon Jin Lee
German Marianne Graffam
Chinese Bo Qi Hui
Also Known As Mugi
Age 15-18
Birthday July 2, 1991
Class 1-2
Musical Profile
Role Keyboardist
Main Music Composer
Instrument Keyboard
Korg Triton Extreme 76

Korg RK-100 in White
Gender Female
Height 157 cm
Weight 53 kg
Hair Tan
Eyes Sapphire Blue
Blood Type O

Tsumugi Kotobuki (琴吹(ことぶき) (つむぎ) Kotobuki Tsumugi), otherwise known as Mugi (むぎ) is one of the 5 main characters in K-ON! She is a wealthy, cheery, cute girl with a gentle personality who plays the keyboard and is the main musical composer in the band Ho-kago Tea Time.

Her voice actresses are Minako Kotobuki (Japanese) and Shelby Lindley (English).


Tsumugi, who often goes by "Mugi", is the keyboardist of Ho-kago Tea Time. Tsumugi is a wealthy girl who has a sweet and gentle personality. She has been considered a piano prodigy since she was four, and has won many piano recital contests. As the daughter of a company president, Tsumugi and her family own several villas in various places around Japan (and even one in Finland, much to Ritsu, Azusa and Ui's surprise when they tried to contact her at home). She often brings sweets and confectioneries to her friends, which usually ends up distracting them from practicing. The tea set and the tea which they drink often are unusually high in price. Although she is a sweet and gentle girl, she is often entranced by the sight of two girls interacting closely together, sometimes imagining something more risque. She originally intended to join the choir club, but after Ritsu's false flashback of promising to start a band and seeing Ritsu and Mio's silly interaction, she decided to join the Light Music Club instead. Tsumugi displays a rebellious streak occasionally, due to her wanting to deviate from her wealthy nature, and diverts from a well-behaved and mature demeanor to the surprise of others. She also has a habit of getting a little too enthusiastic about experiencing new things that the others take for granted (such as ordering fast food, eating yakisoba at a festival, and purposely provoking Mio to hit her) since she has little opportunity to experience them with her high status.

Despite being wealthy, she tried her hand at a part-time job at a fast-food restaurant.[1] While a lot of things do not bother her, she is fairly conscious about her weight (just like Mio), and she gets a bit anxious when her family's staff start spoiling her friends during villa visits.

Another characteristic that distinguishes Tsumugi from most girls her age is her surprisingly prodigious physical strength. Her astounding feats of strength include rapidly carrying various pieces of Ritsu's drum set, one by one, with seemingly little effort and even humming a happy tune throughout; abruptly defeating the arm wrestling machine on maximum setting at the Game Centre, which Ritsu had painfully struggled against; and sending Akira flying into a wall with a "light" slap. Furthermore, she regularly runs a brisk jog with her instrument, the Korg Triton Synthesizer, slung across her shoulder. (The Korg Triton is a hefty piece of equipment: at seventeen kilograms, its weight is comparable to that of a FIM-92 Stinger Missile or FGM-148 Javelin Missile Launcher.[2][3][4]) Additionally, she did not tire or slow down while dragging thirty kilograms of luggage and carrying her Triton Synthesiser over her shoulder as the band was running to catch a Taxi to London Heathrow Airport.


Tsumugi has long, wavy blonde hair, sapphire-blue eyes, and a very fair complexion different from the other girls of HTT. She also has thick yellow-brown eyebrows that resemble her father’s.


Skirts over pants. High-class attire, such as elegant one-piece dresses.

Sakuragaoka High Uniform []

Tsumugi.png Like all Sakuragaoka High School students, Tsumugi wears a school uniform. The Sakuragaoka uniform consists of a navy blue blazer, a solid white buttoned shirt (under the blazer), a colored ribbon (different colors for different student years, Tsumugi's year is light blue), a light steel blue skirt, stockings or socks (Tsumugi's are white), and maroon shoes. The summer uniform replaces the blazer with a beige waistcoat. Additionally, the subject physical education requires a tracksuit (sport jacket with long pants, colored again depending on the year group) with white striped brims, a white shirt with colored endings (again colored regarding the year group) for the summer semester and white sports shoes.

"Don't say 'lazy'" Attire[]

Tsumugi Don't Say Lazy Attire.png Tsumugi's "Don't say 'lazy'" attire consists of a long dress. Its lower half is striped black and white while its upper half is plain black, accompanied by black frills at the top. On each arm, she wears a long, tight black glove. She also wears plain light green stockings and circle-shaped green earrings. Her hair is being tied into a round bun.

"Listen!!" Attire[]

Tsumugi Listen! attire.png Tsumugi's "Listen!!" attire consists of a black and white striped shirt with a symbol of a heart on it, accompanied by a long, baggy white skirt and a black jacket with a pair of white high-heeled shoes. She also wears a sailor's hat. One half of her hair is being tied to a curly ponytail while the other parts are left untied.

"NO, Thank You!" Attire[]

Mugi NO, Thank You! 1.png In "NO, Thank You!, Tsumugi's attire is similar to any school uniform dress code. Her attire is very similar to the Sakuragaoka High School uniform - navy blue blazer and a white buttoned shirt (under the blazer). The only parts different are a "HTT-logo" pinned to her blazer, a plaid grey skirt, a red tie, a grey waistcoat, dark blue socks and her black shoes. Her attire appears a bit disheveled, with the tie being disorderly tied and the shirt being messily buttoned. Her jacket isn't buttoned either.
Mugi NO, Thank You! 2.png Tsumugi's second attire in "NO, Thank You!. She wears a red shirt underneath a pink one with a violet and a green button on it. She also wears flouncy, violet shorts over dark-violet tights. Her hair is tied with a violet ribbon to a ponytail which falls down over her right shoulder.

"Singing" Attire[]

Tsumugi Singing attire 1.png Tsumugi's "Singing" attire. Like the rest of the band, she wears a light blue one-piece dress over a white shirt. The skirt goes down to her knees. The dress has four white dots over the chest, a white bow and a white collar. Additionally, Tsumugi wears black shoes with white shoelaces over long white socks, which have red and blue stripes on them. Her hair is tied into two neat ponytails that are decorated with white bows abreast her ears.
Tsumugi Singing attire 2.png Tsumugi's second attire in "Singing". She wears a black-white jacket that is mostly unzipped and has "Rock 'n Roll" written on its back, a multicolored bra, a white, baggy skirt and black and white shoes. Her hair is tied to a long ponytail, fixed with a pink hair tie. She also wears a large blue orb as an earring.

Other Content[]

Character Image Songs

K-ON! CISS Volume 4 Mugi.jpg K ON Character Song Tsumugi Kotobuki.jpg
K-ON! Character Image Song Series Vol. 4: Tsumugi Kotobuki K-ON!! Character Image Songs: Tsumugi Kotobuki