actually... her hairstyle... basically makes her turn into any of the K-ON characters that you see in the anime.
Graduation & Ponytail = Ui Long Hair = Mio Unfashionable & Unruly short Hair & Short hair (bangs held with a pin)= Yui Short hair with bangs up = Ritsu Long Hair = Mugi, if you change the color to Blond
Changing the colors of a few hairstyles, and you can mix and match bunch of characters...
⑦ Unfashionable short hair⑧ Super short hairNakano Azusa (Azu-nyan) original imageAzu-nyan after high school graduation⑭ Braided⑪ Buns④ Long hair⑨ Unruly short hair (aka asymmetrical hair)① Twintails (short hair)② Twintails (short hair with ribbon)③ Ponytail⑤ Short hair⑥ Tied to the side⑬ Short hair (bangs held with a pin)⑮ Glasses-ON⑩ Short hair with bangs up⑫ Ponytail (tied to the side)