Noto Mamiko is my all time favorite, her voice is so unique, as in , that very soft and gentle spoken voice just amazes me, and its easy to recognize her voice because of that shes voiced for shimako from maria sama ga miteru, enma ai from jigoku shoujo, kotomi from clannad, reiri(the vampire)from kaibutsu oujo and toujo aya from ichigo 100% and lots more shes awesome.
i also really like Koyasu Takehito