
Quick answer — Rei Igarashi voices Miho Iwakura in Serial Experiments Lain, Selizabeth in Magic Kaito 1412, Ato Mawashi no Majo in Tropical-Rouge! Precure and 7 more characters.
Rei Igarashi voices Miho Iwakura (Serial Experiments Lain), Selizabeth (Magic Kaito 1412), Ato Mawashi no Majo (Tropical-Rouge! Precure), Kuroha Shiratori (Eden of the East), Precia Testarossa (Magical Girl Lyrical Nanoha), Berta Lamprogue (The Reincarnation of the Strongest Exorcist in Another World), Mary (Welcome to THE SPACE SHOW), Ryouko Naruse (Shangri-la) and 2 more.
Miho Iwakura is voiced in Japanese by Rei Igarashi.