In some fanfictions, Natsu as the 1st master of Fairy Tail might be depicted as a powerful and visionary leader. He could be shown as someone who laid the foundation for the guild's values of friendship and strength.
In fanfiction, if Naruto becomes the master of Fairy Tail, it would be an amazing blend of two very different universes. Naruto's skills like his shadow clones could be used in interesting ways within Fairy Tail. For example, he could send clones on different quests at the same time. His determination and leadership qualities from his own world might also bring a new dynamic to Fairy Tail. He could inspire the members to be more united and strive for greater power in a different way than Makarov did.
It could be about Naruto, who is a master in some way, within the context of the Fairy Tail universe. Maybe he has some unique abilities or a special role in the Fairy Tail world, like being a powerful mage or having some kind of connection to the Fairy Tail guild.
Perhaps as the Fourth Master, Natsu discovers some long - lost secrets about Fairy Tail. These secrets could be related to the origin of the guild or some powerful magic that was hidden away. He then has to figure out how to use this knowledge to the guild's advantage without causing chaos.
I really like 'A New Adventure in the Merged Worlds'. In this fanfiction, the author does a wonderful job of bringing together the distinct art styles and character traits. It's full of action and adventure, with the heroes from Fairy Tail and Rave Master teaming up to face a powerful new threat.
Obviously, Naruto would be one of the main characters. And probably some of the key Fairy Tail characters like Natsu, who is known for his fire - dragon slayer magic, and Lucy, who uses celestial spirit magic. They are likely to interact with Naruto in the fanfiction.
The plot is crucial. It should be engaging and make use of the rich magic and world - building elements from both Fairy Tail and Rave Master. A fanfiction that simply throws the characters together without a proper plot won't be very good. For instance, a story about a common enemy that requires the combined powers of both groups of heroes can be very exciting.
The plot might involve a powerful magical item that exists in both universes. In the fanfic, characters from both Rave Master and Fairy Tail could be in a race to obtain this item. For example, Elie from Rave Master and Lucy from Fairy Tail might have some sort of rivalry or partnership in the search for it. And along the way, they discover that the item has the power to either save or destroy both worlds.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. They have a wide variety of fanfictions for both Rave Master and Fairy Tail, including crossovers between the two.