In my opinion, Makarov could be the ideal Fairy Tail guild master in game fanfiction. He has great leadership skills and a strong sense of justice. His magic power is also quite formidable, which can add a lot of exciting elements to the game.
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.
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.
A powerful dark wizard who was once a member of Fairy Tail but was banished for using forbidden magic could be a great antagonist. They hold a grudge against the guild and especially the guild master for their expulsion and now seek revenge by trying to destroy the guild from within.
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.
The guild would be in chaos. The members would be shocked and divided. Some might side with Natsu if they believe there was a just cause, while others would see him as a traitor. There would be a power vacuum, and different members might vie for the position of guild master. This could lead to internal strife and potential break - up of the guild.
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 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.
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.