Mine are
- Rie Tanaka (Have seen her in Hayate no Gotoku, as Maria, but maybe in other anime too XD)
- Maaya Sakamoto (Have seen her in both Tsubasa, Kara no Kyoukai and in other anime , eg this season she does a girl in 'Arakawa under the Bridge')
- Yuuka Nanri (I have seen Gunslinger Girl [season 1] in which she does Henrietta and is so
)
- Kikuko Inoue (she does girl voices in many anime, but I think that the most notable is 'Ah my Goddess'), her voice is
as well.
- Mizuki Nana is great too (Have seen her in Nanoha (as Fate), Earl and Fairy and I think she did Shiki's sister in KnK as well)
- Jimang (He does the narrator in Hayate no Gotoku and have seen him in many other anime, most of the times voicing the bad guys, no matter the role he sounds so funny XD, he's great!)
also I have some more favourite but I dont know their names (can recognise by anime character
)
P.S: Oh I forgot about Inoue Marina XD, thanks Halo, yes her role in Valkyria was great (she has also done that little girl that wasnt talking in El Cazador XD)