Tuxedo Mask and Kaiba. Tuxedo Mask is the mysterious protector in Sailor Moon, and Kaiba is the arrogant and powerful duelist in Yu - Gi - Oh. They would likely start off as rivals. Kaiba might see Tuxedo Mask as a competitor, not just in dueling but also in terms of charisma. Tuxedo Mask, on the other hand, would try to get Kaiba to see the value of fighting for a greater good rather than just for power and victory.
The characters would likely be initially confused. Yugi might be shocked to see Sailor Moon's magical powers, while Sailor Moon could be intrigued by the dueling concept. They would start to learn from each other. For example, Tuxedo Mask could help Yugi with his strategy, as he is often a strategist in his own battles against the Dark Kingdom.
Well, perhaps there's a dark force that is affecting both the Sailor Moon world and the Yu - Gi - Oh world. The characters from both series team up. Yugi and his friends could teach the Sailor Guardians about the rules of dueling, while the Sailor Guardians could use their magic to help Yugi and the gang in battles against the common enemy. Their combined powers would make for an epic adventure.
A cool plot would be if there was a tournament in the Yu - Gi - Oh world, but it was being secretly manipulated by a Sailor Moon villain. The Sailor Guardians enter the tournament to expose the plot. Along the way, they meet the various Yu - Gi - Oh characters and form alliances. The Yu - Gi - Oh characters are initially skeptical of the Sailor Guardians' powers but soon come to realize how useful they can be in the high - stakes duels.
Ash from Pokemon and Yugi from Yu - Gi - Oh would be really interesting. Ash is a fearless and determined Pokemon trainer, while Yugi is a strategic and kind - hearted duelist. Their different personalities and skills would create a great dynamic. They could learn from each other, like Ash teaching Yugi about the bond between a trainer and a Pokemon, and Yugi showing Ash the intricacies of dueling.
Jaden from Yu - Gi - Oh GX and Yusei from Yu - Gi - Oh 5DS are very likely to form an alliance. Jaden is known for his enthusiastic and adaptable dueling style, and he is always up for a challenge. Yusei, on the other hand, is a strategic and determined duelist. Their combination would be great as Jaden's out - of - the - box thinking could complement Yusei's well - planned strategies. They could face any enemy that comes their way with confidence.
Definitely Sailor Moon and one of the Steel Angels. Sailor Moon's pure - hearted and kind nature would contrast with the more mechanical and mission - focused Steel Angel. Their interaction could start with misunderstandings as the Steel Angel might not understand Sailor Moon's emotional way of approaching problems, but over time, they could develop a deep friendship.
A cool plot could be that there is a mysterious tournament that somehow bridges the two worlds. Duelists from Yu - Gi - Oh GX and Yu - Gi - Oh 5DS are invited to participate. However, it's not a normal tournament as there are strange rules and hidden agendas. The GX characters, like Jaden, bring their fun - loving and sometimes unpredictable dueling styles, while the 5DS characters, such as Yusei, bring their more strategic and high - speed dueling approaches. As the tournament progresses, they start to uncover the truth behind it and have to work together to stop those who are misusing the tournament for evil purposes.
In a Yu - Gi - Oh GX crossover fanfic, I think Aster Phoenix would be a great addition. His cool and confident demeanor and his strong connection to his cards could add a lot of depth. Also, the Ojama Trio could be included for some comical relief. They could get into all sorts of wacky situations in the crossover world. Additionally, Atticus Rhodes. His laid - back attitude and his relationship with Alexis could be explored further in a crossover, especially if there are elements of romance or family drama involved in the new world.
Perhaps a plot where the Millennium Items from Yu - Gi - Oh GX end up at Hogwarts. The Hogwarts teachers and students are intrigued and confused by these strange artifacts. Harry, being the curious and brave hero, tries to figure out their powers. He discovers that they have a connection to an ancient magic that is different from what they know in the wizarding world. This leads to a series of adventures as they try to keep the Millennium Items away from the wrong hands, like Voldemort or some of the dark forces in the Yu - Gi - Oh GX world.
Yami Yugi from Yu - Gi - Oh is also a strong contender. His Millennium Puzzle gives him access to powerful magic and ancient knowledge. In a crossover, he could use his skills to outwit Pokemon trainers. He might be able to predict their moves and use his cards in ways that would give him an advantage against the Pokemon. He could also form a bond with some of the more intelligent Pokemon and use their powers to enhance his dueling abilities.