Tsumugi Kotobuki

Tsumugi Kotobuki (aka, Mugi) is one of the main protagonists of the K-ON! series, she plays the keyboard. She is known to be a rich girl. 
When the Miraculous is inhabited by the OC, Muff, Mugi becomes Usakura, a rabbit-themed superhero who helps Master Bug and friends 'during particularly different missions' in the first season and beyond.
==Bio==
=== K-ON! RETOLD series ===
According to Yui's dream, Mugi's eyebrows are takuwan pickles, and Yui would often pick one out. 
She is shown to read people's thoughts, this was displayed when she read Azusa's.
=== Kimberly's Adventures series ===
==Personality==
She 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, Mugi 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 is childish and really sweet to others, and thinking the club was funny and exciting which made her join the Light Music Club. She is known to get captivated by anything that fantasize as "yuri" according to the anime and the manga.
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. Mugi 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. 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.
In the "K-ON Series - Season 2 - Episode 20 - Yet Another School Festival!", it is revealed she can get emotional and has a habit of throwing a tantrum, saying that she didn't want the band to end, and gets into a sudden outburst of tears.
In chapter 19 of the manga, and possibly in the anime, it is revealed that Mugi could be really scary when she is angry. This can be seen by the way she scolded a servant when he interrupted Mugi when she was talking with Mio on the phone.
== Known Monster ==
===Pokémon===
===Digimon===
===Kwami===