Yu-Gi-Oh! GX, known in Japan as Yu-Gi-Oh! Duel Monsters GX and GX standing for Generation Next, is the successor and first spinoff series to the Yu-Gi-Oh! anime and manga.
Yu-Gi-Oh! GX, a manga spinoff of the series written by Naoyuki Kageyama, was published in Shueisha's V Jump magazine in Japan.
Taking place ten years after the events of the original Yu-Gi-Oh! series, Yu-Gi-Oh! GX follows a young boy named Juudai Yuuki who attends Duel Academy, a special institute founded by Seto Kaiba which teaches young duelists all about the game of Duel Monsters. Using his Elemental Hero deck and a Winged Kuriboh card given to him by Yuugi Mutou, Jaden makes various new friends and rivals and takes on many challenges in his quest to become the next King of Games.
The main protagonist of the series. He is described as an energetic, passionate and optimistic boy who comes to Duel Academy to learn to become the new King of Games. He enjoys seeking out new duel challenges and is known to be quite lucky when it comes to his draws. He is capable of communicating with Duel Spirits, most often conversing with Winged Kuriboh, a card he received from Yuugi Mutou on the day of his entrance exam. He specializes in using Fusion Monsters, his main deck being the Elemental Heroes deck before later obtaining a set of Neo-Spacian monsters and his key card, Elemental Hero Neos. Following the third season, in which he entered an alternate dimension and confronted the duel spirit, Yubel, he has gained the powers of both The Supreme King, an evil alter-ego he temporarily took on, and Yubel, giving him powerful insight.
Juudai's roommate at Duel Academy. He often doubts himself, living in the shadow of his older brother Ryou,#2 but has shown himself to be a talented duelist, managing to rise in the ranks from Slifer Red to Ra Yellow to Obelisk Blue. He battles using a Vehicroid deck, which in season four becomes a Cyberoid deck that he creates by implementing Ryou's Cyber Dark Dragon deck.
A beautiful and talented duelist who is regarded as the queen of the Obelisk Blue. She is not elitist like many of the other Blue members, and quickly takes interest in Juudai. Later, it is also revealed that she loves Juudai. She duels using a Cyber Girl deck.
A freshman duelist who ranks in the Obelisk Blue. He is elitist, thinking that low-scoring duelists such as Juudai should be kicked out. He thus becomes one of Juudai's rivals throughout the series. It is revealed early in the first season of the series that his elitism stems from his older brothers who urge him to become a great duelist in order to have their family reign over the dueling world, as his brothers rule over the political and financial worlds. After becoming estranged with his brothers, Jun decides to pursue a career in dueling, without their help. It is revealed that Jun has a soft side in the second season. When Asuka's brother arrives to take his sister to make a band, they have a duel. During the duel, Jun cheers on Asuka. He also has an awkward crush on her. He initially uses a power based deck, focusing on powerful monsters such as the Armed Dragons.