Just going off stuff I've seen, I think she did a realy nice job with Nogami, Aoi and Arashiyama, Sayoko.
And I can't say she did a bad job with Takahashi, Minami (AKB0048)
Jasmine, Ayumi (aria)
Someya, Mako (Saki)
Takanashi, Kazue (Working!!)
Nishigaki, Nana (Yuru Yuri)
Although I do suppose those last two can sound a bit masculine at times.