
Quick answer — Yuki Nakao voices Black Magician Girl in Yu-Gi-Oh!: The Dark Side of Dimensions, Mana in Yu-Gi-Oh! 3D: Bonds Beyond Time.
Yuki Nakao voices Black Magician Girl (Yu-Gi-Oh!: The Dark Side of Dimensions), Mana (Yu-Gi-Oh! 3D: Bonds Beyond Time).
Black Magician Girl is voiced in Japanese by Yuki Nakao.