Noah Kaiba

Noah Kaiba is the son of Gozaburo, and the main antagonist of the first half of Season 3, Enter the Shadow Realm, in Yu-Gi-Oh! He only appeared in the anime.

Noah was nearly killed in an accident, so Gozaburo uploaded his mind into the virtual world. He then adopted Seto Kaiba to have Noah take over his body, but soon forgot about him, until he lost Kaiba Corp to Kaiba, and uploaded his own mind into the virtual world. Six years later, Noah decided to take revenge on Kaiba. He teamed up with the Big Five (who had become trapped in the virtual world, and their bodies in the outside world destroyed), promising to get them bodies if they helped him get his revenge so he could rule Kaiba Corp.

Noah appeared to disapprove of cheating, as he nearly pulled the plug on Johnson of the Big Five for cheating during his duel with Yugi. After the Big Five lost to Yugi and Joey and attempted to take their bodies by force, Noah recalled them and imprisoned them each in an isolated portion of the virtual world forever. However, as Noah was dueling Kaiba, Mokuba (whom Noah brainwashed into believing that Kaiba hated him), stopped Kaiba from beating him, and Kaiba lost. Noah turned him to stone, but Yugi continued the duel. Noah turned everyone else to stone, but was defeated by Yugi in the end. It is soon revealed that Gozaburo was the one pulling the strings the whole time, and Noah was working for him. Noah escaped the virtual world, entering Mokuba's body, and set the fortress the virtual world was stationed in to explode, which would delete the virtual world and everyone in it. However, he eventually had a change of heart and returned to the virtual world to help everyone escape. He held Gozaburo, who was a beast of flame at the time, in place as the virtual world was destroyed, and Noah and Gozaburo along with it.

It is suspected by Yugi and the others that Noah saved his mind on a backup drive. It is unknown whether or not he did, and he has never been seen since the destruction of the virtual world.