Jaden Yuki

Jaden Yuki is the main protagonist of Yu-Gi-Oh! GX, and a main proswagonist of Yu-Gi-Oh! The Extended Edition.

A laid-back slacker, Jaden is determined to just have a good time, even if it means ignoring the anime plot disasters unfolding around him.

Backstory
Even when he was a young child, Jaden loved Duel Monsters. His childhood favorite card was a monster known as Yubel, who was a thirsty yandere who would kill his friends. After Jaden won a contest to send some Duel Monsters into space (for SOME reason), Yubel was also shuttled off, allowing Jaden to live a mostly-normal life.

By the start of Yu-Gi-Oh! The Extended Edition, Jaden is a first-year student at Duel Academy, living in the Slifer Red dorm. Depending on the timeline, he will be rooming with either Syrus Truesdale and Chumley Huffington, Yuya Sakaki, or some combination of the three.

Biography (Fanfic)
Jaden's first appearance is in IN THE BEGINNING THERE WERE COLONS. He was banished to the Shadow Realm by Yami Yugi, where he became decrepitly old, for some reason. As a result of his banishment, he was dragged into that mess of a plot with Joey and the other beta protagonists. After the story ended, Jaden perished due to his time in the Shadow Realm.

Trivia

 * Jaden could be considered the first primary proswagonist before Yuya, since several of the fanfic plots revolve heavily around him.
 * Jaden's alternate form, The Supreme King, has yet to be seen, but he has been mentioned in both Force of Will: The Extended Edition, and Into the VRAINS.