I love Mizuhashi myself. She can do things from young girls (Vivio) to males (Yuuno) so she definitely has range. The earliest role I recall seeing her in is Akane from Kimi ga Nozomu Ein. Recently, I've been enjoying her in Baka Test and I've always loved her as Miyako in Hidamari Sketch. She's also
White Len in Melty Blood and is one of the reasons I like playing as her.
I can say a lot on all the VAs involved with Nanoha, but I'll save that for when I have more time.