
Quick answer — Rieko Takahashi voices Dianna Soreil in Turn A Gundam, Kihel Heim in Turn A Gundam, Neviril in Simoun and 5 more characters.
Rieko Takahashi voices Dianna Soreil (Turn A Gundam), Kihel Heim (Turn A Gundam), Neviril (Simoun), Yukino (Samurai 7), Conis (One Piece: Episode of Skypiea), Shiwori Nakagami (True Tears), Charlotte Oba-san (Mechanical Marie), Mari Fukami (Glasslip).
Dianna Soreil is voiced in Japanese by Rieko Takahashi.