Hmm, where do I start?

First noticed her as crazy teacher Ms. Yukari in Azumanga Daioh, and then Kaname in Full Metal Panic Fumoffu. She also seems to attract the tsundere bossy teenage girl roles. Then came Super GALS where she plays lead character Ran Kotobuki. That's like required viewing for Luci fans, since she has a strong role in the show, although she uses some language, so I wasn't so keen on that. Asuna in Negima totally suits her, and so does playing that mom in AIR.
Then you have her cutesy nice girl voices: Duck in Princess Tutu and Risa Harada in DN Angel, and the girls in Kodocha and Tsubasa Chronicle.
In Pretear she has a ton of lines, and that's one of the few series I watched just because she voiced in it.