They would interact in very interesting ways. Naruto might be curious about the magic of Fairy Tail and try to learn some spells. The Fairy Tail characters, on the other hand, would be amazed by Naruto's ninja abilities. For example, Gray might be interested in Naruto's ability to walk on walls.
In this fanfic, the interactions could be both competitive and friendly. During the Grand Magic Games, they would be opponents on the battlefield but friends off it. Naruto could share his stories of the ninja world with the Fairy Tail members, and they could in turn tell him about their adventures in the world of magic. There could be some friendly rivalries too, like Naruto and Natsu competing to see who can defeat more opponents in the games.
In this fanfiction, perhaps the Grand Magic Games are altered due to the presence of Naruto characters. For example, there could be new events that test both ninja skills and magic. Sasuke could use his Sharingan to counter some of the illusions created by Fairy Tail mages. And characters like Erza would be intrigued by the different fighting styles of the Naruto universe, leading to some epic battles and exchanges of techniques.
Well, one way it could work is by having characters from both Naruto and Fairy Tail participate in a Grand Magic Games - style tournament. The Naruto characters could use their ninja skills, like jutsus, while the Fairy Tail mages use their magic. They'd have to compete in various challenges that test both physical and magical abilities.
They would bring new powers. Naruto's Rasengan could be a very powerful attack in the games. It could be compared to some of the big - hitting magic spells in Fairy Tail.
Naruto would likely be curious about the magic in Fairy Tail. He might try to learn some spells. The Kyuubi, on the other hand, could be a source of fear for some of the Fairy Tail members at first. Natsu might see Naruto as a rival in terms of strength and want to have a friendly fight. Lucy would probably be intrigued by Naruto's story and the Kyuubi. She might offer to help him understand the Fairy Tail world better.
In Naruto, Naruto himself would be a strong contender. His vast chakra reserves and his ability to use multiple powerful jutsus like the Rasengan and the Sage Mode would give him an edge. From Fairy Tail, Erza would be a top contender. With her Re - Equip magic, she can quickly change into different armors with various abilities, making her very adaptable in different challenges.
A fanfic of this nature would likely explore the cultural differences between the two universes as well. The Grand Magic Games are not just about battles but also about representing one's guild. Naruto, coming from a ninja village, would have to understand the concept of a guild. He might bring in his own sense of loyalty and teamwork from the ninja world. And the Fairy Tail members would be intrigued by his strange powers. There could be humorous moments as they try to figure out how his jutsu works compared to their magic. And in the battles, the clash of Naruto's chakra - based attacks and the Fairy Tail mages' elemental magic would make for some really intense and visually stunning scenes.
Natsu is definitely one of the key characters. His strength and determination are always crucial for Fairy Tail. He's likely to be in the thick of the action, taking on tough opponents head - on.
If Naruto were neglected and ended up in the Fairy Tail world, characters like Natsu would likely be intrigued by him. Natsu might challenge Naruto to a friendly fight, seeing his strength. Naruto, on the other hand, would be amazed by the magic. Lucy might be sympathetic to Naruto's situation of being neglected, as she has her own insecurities. Erza could respect Naruto's combat skills and might even train with him. Gray and Naruto could bond over their cool - headedness in battle. The interactions would be a mix of cultural exchange, with Naruto's ninja culture clashing and then meshing with the magic - based culture of Fairy Tail.
In this kind of fanfiction, the relationships within the guild could deepen in different ways. Since there's no Grand Magic Games, the members would have more time to interact on a daily basis. This could lead to new romances blooming. For instance, Erza might have more time to get to know Jellal on a personal level without the distractions of the games. Also, the younger members could form stronger bonds with the older, more experienced ones as they would be around each other more often.
One idea could be Natsu getting a new, powerful form during the Grand Magic Games. This form could be a result of some ancient magic he discovers. He then uses this form to defeat a really tough opponent and surprises everyone, including his guildmates.