田井中 律

Ritsu (or Ritchan, as nicknamed by Yui) is the self-proclaimed president of the light music club and plays a yellow Rick Marotta Signature Yamaha Hipgig drum kit combined with a cymbal set from Avedis Zildjian. She has an ambiguous yet upbeat personality, much like Yui, but often has trouble remembering important club activities and announcements and gets constantly rebuked by Mio and Nodoka for forgetting to send in important forms concerning the club. Ritsu is cheerful, often likes making jokes and is sarcastic most of the time. She is skilled at brainstorming ideas that earn money for the club. She usually wears her school jacket open. She says she chose to play the drums because they are "cool", but later admits that she has trouble playing instruments which involve intricate finger movements, such as the bass, guitar and keyboard.
She is Mio's childhood friend and will often take the opportunity to tease her whenever Mio is cowering from something. She is also known to become easily jealous of Mio's other high school friends, even going as far as spying on Mio when on outings with them. Ritsu is always on the go and will stop at nothing for the success of the light music club. She is skilled at cooking. She has a younger brother named Satoshi.

From url=http://en.wikipedia.org/wiki/K-On!#Characters.