
Quick answer — Sayaka Narita voices Kyouko Touno in Tokyo Majin Season 2, Melon in Akikan!, Christel Ketsuno in Gintama and 3 more characters.
Sayaka Narita voices Kyouko Touno (Tokyo Majin Season 2), Melon (Akikan!), Christel Ketsuno (Gintama), Kusu Kusu (Shugo Chara!), Marielle (Pumpkin Scissors), Mayu Miyuki (Ai Yori Aoshi).
Kyouko Touno is voiced in Japanese by Sayaka Narita.