Digimon Adventure/Appendices/Cast

Hiroyuki Kakudo's Rusted Palace
In the 02 section of his site, Kakudo mentions duplicate casting in some episodes' notices. For a full list, see the 02 cast list. While not explicitly mentioning the names of the voice actors, the site mentions which voices are shared to credited characters. The voice actors are named here for easier consultation.

Memories of our Digimon Adventure interview

 * Toshiko Fujita: Taichi Yagami, Toshiko Takenouchi
 * Chika Sakamoto: Koromon, Agumon, Greymon, etc.
 * Youto Kazama: Yamato Ishida, MetalSeadramon
 * Mayumi Yamaguchi: Tsunomon, Gabumon, Garurumon, etc.
 * Yuko Mizutani: Sora Takenouchi, Yuuko Yagami
 * Ai Maeda: Mimi Tachikawa
 * Masami Kikuchi: Jo Kido, Shin Kido, Masami Izumi
 * Umi Tenjin: Kōshirō Izumi