>>4457506Tsumugi is a character from the japanese mangas and anime series 'K-ON!'.
According to Wikipedia: "Tsumugi, often referred to as 'Mugi' by her friends, is a wealthy girl with a gentle and sweet personality [...] Tsumugi displays a rebellious streak occasionally, diverting from her normally well-behaved and mature demeanor to the surprise of the others. She also displays a childlike eagerness from time to time, and possesses unusually high strength, being able to effortlessly carry around her own keyboard ... "
So, she looks innocent and cute like Fluttershy, but she has more strength, intelligence (implied in the anime) and curiosity for things.