YuiAzu

UiAzu is the femslash ship between Yui Hirasawa and Azusa Nakano from the K-On! fandom.

Canon
When Yui and Azusa met, Azusa was a new member of the K-On! Light Music Club.(After School Tea Time)She joined thinking that Yui was a talented guitarist, but as she got to know her, she realized that Yui liked to procrastinate a lot. However, Azusa admires Yui's ability to go far due to sheer determination, the fact that she has perfect pitch, and her affection towards friends, including Azusa.

Yui developed an immediate affection for Azusa, even giving her a nickname, Azu-Nyan, after convincing Azusa to wear cat ears and say "Meow". This nickname was used by Yui throughout the series. At first, Azusa thought that the nickname was weird, but later on she grew accustomed to it, and her given name for the cat that she was caring for was "Azu-nyan 2". Yui is constantly hugging Azusa, which, just like her nickname, she found annoying at first, but then got used to it. Her resistance to Yui's spoiling her diminished over time. Yui has tried to kiss Azusa before, but Azusa slapped her face.

Azusa's and Yui's personalities clash a little bit. Azusa has a work driven, diligent personality, and Yui is more laid back. However, they have grown close, even performing in a talent show together, taking the band name, YuiAzu. Despite trying to hide it through her strictness, Azusa is fond of Yui and they become close, sharing a room during the band's trip to London.

Fanon
The reaction to this ship has been mostly positive. Since the pair are so close, and Yui is constantly hugging or close to Azusa, people ship this a lot. Another reason why people like this ship is because Yui has tried to kiss Azusa. Even though this ship is very popular, it comes second to Mitsu, the ship between Mio and Ritsu. People sometimes think of this ship as an alternative to ships like Ui x Azusa, or Nodoka x Yui.

Fanart and fanfiction has been made with this ship. Azusa is often portrayed as a tsundere like character due to her harsh nature towards Yui and the fact that she is actually very fond of Yui. This is an example of the senpai x kouhai ship, which is another reason that it is so popular.

Trivia

 * The ship name comes from the band name that Yui and Azusa adopted for the festival.