This article lists the supporting characters that appear in two or more of the three major pieces of Yu-Gi-Oh media: the original manga, and its two anime adaptations, the 1998 Yu-Gi-Oh! anime by Toei Animation and 2000's Yu-Gi-Oh! (known as Yu-Gi-Oh! Duel Monsters in Japan) by Studio Gallop and Nihon Ad Systems. Characters are referred to by their Japanese names, which are presented in Western order (given name first, surname second). Different names featured in the English anime or the Dungeon Dice Monsters video games are also noted where appropriate.
For a listing of the major characters across the three media, see: List of Yu-Gi-Oh! main characters
For a listing of characters who appear in only one of the three media, see: List of Yu-Gi-Oh! anime, manga or movie only characters