
Quick answer — Miho Saiki voices Maho Minami in Beck: Mongolian Chop Squad, Kaori Aso in Paradise Kiss, Buchi in Sketchbook ~full color's~ and 2 more characters.
Miho Saiki voices Maho Minami (Beck: Mongolian Chop Squad), Kaori Aso (Paradise Kiss), Buchi (Sketchbook ~full color's~), Masumi Fuyuki (Minami-ke: Okawari), Itsuki Kusunoki (Natsunagu!).
Maho Minami is voiced in Japanese by Miho Saiki.