I'm not going to say she has no personality but she's a boring character to me. As are all of the Lucky Star characters--hence why I couldn't get into it.
I'm gonna branch out and go with Natsumi Mizuki from GetBackers. The show isn't outstanding and definitely has its pitfalls, but she was possibly the worst character in the show. Even the blind girl with a solid 20 lines has more of a personality than her. The sub-characters were pretty awesome in GetBackers, and while I wasn't expecting another Kazuki or Paul, Natsumi was just an average, cliche, no-point-in-being-there high school anime girl.