It's really hard to say. Jaden has his own set of powerful cards and his unique dueling style which is quite aggressive and adaptable. However, Yugi has a lot of experience and his strategies are very deep. So it could go either way depending on how the duel is set up.
A major plot twist could be that Jaden's departure was actually a ruse. He was secretly working with an unknown organization to expose a hidden threat within the Duel Academy. He pretends to leave, but then sneaks back in to gather evidence. This would turn the whole 'leaving' concept on its head and add an element of mystery and intrigue to the fanfiction.
Perhaps Jaden leaves Duel Academy due to some sort of inner turmoil. He could be haunted by his experiences with the Shadow Realm or other dark forces. He decides that leaving the academy is the best way to find peace and figure out who he really is without the constant pressure of dueling for grades and reputation. He might travel to remote places, meet new people, and learn different dueling styles that help him on his path to self - discovery.
Perhaps they would engage in an epic duel. Jaden with his Elemental HERO deck and Yugi with his Dark Magician - based deck. This duel could be a test of both their skills and a way to exchange ideas about the spirit of dueling.
Growth is also prevalent. They start as students at Duel Academy and as the fanfiction progresses, they develop not only as duelists but also as individuals, learning important life lessons and becoming more confident in themselves.
One great 'yugioh gx jaden x bastion fanfiction' is 'Dueling Bonds'. It delves deep into their friendship and how they support each other during duels. The character development is on point and it's really engaging.
Another type of antagonist could be a powerful duelist who has a personal vendetta against either Jaden or Alexis. This duelist might have lost to one of them in the past and is now seeking revenge. They would be a formidable opponent, constantly challenging Jaden and Alexis and trying to break their spirits. This creates a lot of tension and drama in the fanfiction.
Common themes include competition. The OC and Jaden often have duels that are not just about winning but also about respect and learning. There is also the theme of mystery. The OC may have a mysterious past or power that Jaden tries to uncover. And of course, the theme of the power of dueling. Their duels are a way to express themselves, solve problems, and bring out the best in each other.
One great 'Yugioh GX Jaden x Alexis fanfic' is 'A New Bond'. It beautifully explores their relationship as they face challenges together at Duel Academy. The story develops their characters in a way that stays true to the original series while adding new and exciting plot elements.
One great fanfiction could be 'A Triangular Duel' where the reader is caught in the middle of Jaden and Zane's rivalry, but also their growing feelings for the reader. It has a lot of intense duels and emotional moments.