
Quick answer — Eri Saitou voices Sayuri Kaede in The Gokusen, Nikora Nanami in Mermaid Melody: Pichi Pichi Pitch, Kaoru Saouji in Sankarea: Undying Love and 1 more characters.
Eri Saitou voices Sayuri Kaede (The Gokusen), Nikora Nanami (Mermaid Melody: Pichi Pichi Pitch), Kaoru Saouji (Sankarea: Undying Love), Ayaka Sudou (The Gene of AI).
Sayuri Kaede is voiced in Japanese by Eri Saitou.