The plot could involve Naruto trying to find a way back to his own world. In the process, he teams up with Fairy Tail to fight a common enemy. His chakra-based attacks could be a new and interesting element in the Fairy Tail battles. For example, his Rasengan might be seen as a super - powerful magic spell by the people in the Fairy Tail guild. He could also form new friendships and rivalries within the guild.
Perhaps Naruto joins Fairy Tail as a sort of exchange. He brings with him the values of the ninja world like loyalty and perseverance. He could get involved in the guild's internal politics and help resolve some conflicts. His shadow clone jutsu could be used to do multiple tasks at once for the guild, such as helping with rebuilding after a big battle or gathering information in different locations.
Most likely he would befriend Natsu. They are both really headstrong and passionate about their respective skills. Natsu would be intrigued by Naruto's ninja abilities and Naruto would be interested in Natsu's fire - dragon - slayer magic. They would probably start off by challenging each other to a friendly fight and from there develop a bond of mutual respect.
Well, perhaps the fanfic could focus on a magic item in Fairy Tail that has a connection to the Kamui power from Naruto. A group of Fairy Tail wizards and a Naruto character team up to figure out the secrets of this item. They might face challenges like rival guilds trying to steal the item and ancient spells that are linked to the Kamui - like power. As they go on this adventure, they also learn about each other's worlds and grow as a team.
A plot could involve a spell in the Fairy Tail world that accidentally summons Naruto and the Kyuubi. The Fairy Tail members are initially scared but then realize Naruto is not a threat. Naruto starts to learn about Fairy Tail magic and tries to find a way to get back home. Meanwhile, the Kyuubi's presence starts to affect the magic balance in the Fairy Tail world, causing some strange phenomena. The guild has to figure out how to send Naruto and the Kyuubi back while also dealing with these new problems.
One possible interesting plot could be that Naruto somehow ends up in the Fairy Tail world. He meets Lucy, who has the Aquarius key. Aquarius initially is distrustful of Naruto but as they face a common enemy, like a dark wizard who is trying to steal all the celestial keys and use them for evil. Naruto's unique jutsu could be combined with Fairy Tail's magic. For example, his shadow clone jutsu could be used in tandem with Lucy's summonings to create a more powerful force against the enemy.
One possible plot could be that Naruto is somehow transported to a world where Saiyan powers and Fairy Tail magic exist. He might start off as an outcast, not understanding these new powers at first. But as he trains and learns, he combines his ninja skills with Saiyan strength and Fairy Tail magic to become a powerful force and fight against an evil that threatens all three aspects of this new combined world.
Well, perhaps in this fanfiction, Fairy Tail characters bully Naruto because they are jealous of the attention he gets from certain characters in their shared universe. They start by making fun of his appearance, like his orange jumpsuit, and then escalate to more mean - spirited pranks, like using their magic to disrupt his ninja training.
Well, it could be that in this fanfic, Naruto is somehow transported to the Fairy Tail universe. And due to his different power set and origin, the Fairy Tail members misunderstand him and think he's a threat. Maybe they see his shadow clone jutsu as some sort of dark magic and turn against him.
Well, perhaps in this fanfiction, Naruto is banished due to a false accusation in his world. He lands in the Fairy Tail world and is seen as an outsider. However, his determination and strong will attract the attention of some of the Fairy Tail members. Erza, for example, might see his potential and take him under her wing, training him in the ways of the Fairy Tail magic while he also teaches her some ninja tricks.
The plot could involve Naruto and Tayuya being mistaken for powerful mages in the Fairy Tail world. Since Naruto has such strong combat abilities and Tayuya has her unique skills. They get dragged into a guild - centered conflict. For example, there could be a rival guild trying to steal a powerful magic item that Naruto and Tayuya are somehow guarding or are associated with. They then have to use their combined skills, Naruto's ninjutsu and Tayuya's jutsu, along with the help of Fairy Tail mages like Natsu or Lucy to fend off the attackers.
The plot could involve Naruto being neglected by his village and feeling lost. Then, through some magical portal or accident, he enters the Fairy Tail world. Here, the Fairy Tail guild could take him in, seeing his potential. Naruto's determination and never - give - up attitude would resonate with the Fairy Tail members. They could go on adventures together, with Naruto using his speed and strength to complement the magic of the Fairy Tail wizards. He might also encounter villains in this new world that are different from those in the Naruto universe, forcing him to adapt his fighting style.