One possible interesting plot could be Naruto, as the guild master, having to deal with a powerful dark guild that is threatening the safety of Fairy Tail. He could use his ninja skills and leadership to gather the members and come up with a unique battle strategy.
In a 'Naruto the Guild Master Fairy Tail' fanfiction, an exciting plot might involve Naruto bringing in some of his old friends from the Naruto world to help Fairy Tail in a grand tournament. The different fighting styles of the ninja and the mages would create a really interesting dynamic, and there could be a lot of friendly rivalries and team - ups.
The plot could revolve around a new Dark Guild that is formed specifically to take over both the Naruto and Fairy Tail universes. They start by stealing important artifacts from both worlds. Naruto and a team of Fairy Tail's strongest mages are brought together by a mysterious force to stop this new threat. As they investigate the Dark Guild, they discover that the guild's leader has a personal vendetta against both Naruto and Fairy Tail. This vendetta drives his actions and makes him a formidable foe. In the end, through teamwork, strategy, and the unique powers of both Naruto and Fairy Tail, they are able to defeat the Dark Guild and restore peace to both universes.
Another great choice could be Laxus. He has that tough - guy exterior but also a lot of room for character growth. In a fanfiction as guild master, he could bring a different leadership style, more aggressive perhaps. He might change some of the guild's traditions while still maintaining the core values of Fairy Tail. He also has a great relationship with his team, which could be further developed in the fanfiction.
A plot could be about a new guild master having to deal with a powerful dark guild threat. The new guild master, say someone like a new character introduced in the fanfiction, has to unite the Fairy Tail members, who are initially skeptical of their leadership. They have to come up with new strategies to combat the dark guild's unique magic and overcome internal differences within Fairy Tail.
Sasuke could also be an interesting addition to this fanfiction. His more brooding and powerful nature would contrast well with the generally more light - hearted Fairy Tail characters. And of course, characters like Erza from Fairy Tail, with her strong leadership and combat skills, would be fascinating to pair up with Naruto in different scenarios.
Well, Naruto is known for his strong leadership skills and determination. If he were the guild master of Fairy Tail, he would probably bring a whole new energy to the guild. He'd likely encourage members to train harder and push their limits, just like he did with his own friends in Konoha. Also, his unique ninja abilities could inspire new types of magic in the Fairy Tail world.
Another plot could revolve around a competition among different guilds to see who has the best guild master. The Fairy Tail guild master has to prove their leadership skills, strategic thinking in battles, and ability to bring out the best in their members. This could involve various challenges like magic duels, treasure hunts, and solving mysteries.
One possibility could be that Natsu is under some sort of dark magic influence. Maybe a powerful enemy has managed to control his mind, making him turn against the guild master. Another reason could be a misunderstanding. If some false information is fed to Natsu about the guild master being a threat to the guild or his friends, his hot - headed nature might lead him to take drastic action without fully understanding the situation.
One possible plot could be that the main characters from Rave Master, like Haru, end up in the world of Fairy Tail by some magical accident. They could then join forces with the Fairy Tail guild to fight a common enemy, like a dark wizard who is trying to steal both the Rave Stones and the powerful magic of Fairy Tail. The different magic styles would create some really cool battle scenes.
Naruto would likely change the guild's training regime. He'd focus on building physical strength as well as magical power. Since he's used to intense training himself, he'd push the members to be better. He might also introduce a system where members help each other more directly, like his team - based approach in Naruto.
The guild master could embark on a quest to find ancient and powerful magic artifacts. For example, they might search for a lost crystal that has the power to enhance the magic of all guild members. This would involve traveling to dangerous and mysterious places, like a forgotten underground temple filled with traps.