Priest Seto Friends

A powerful Dragon in the duel monsters game, that is Seto Kaiba's signature monster.

A mysterious young girl who has the spirit of the Blue Eyes White Dragon residing in her.

Yami Yugi is originally depicted as Yugi Mutou's darker alter ego but eventually he became a character in his own right and was revealed to be an Ancient Egyptian Pharaoh whose soul was housed in the Millenium Puzzle Yugi had assembled.