Well, family is a big theme. Makarov considers the guild members as his family, and in fanfiction, this idea is often explored. For example, how he protects them like a father figure. Also, the theme of sacrifice comes up. Given his position, he might have to sacrifice his own well - being for the guild. And another common theme is the history of Fairy Tail. Makarov has been around for a long time, so his knowledge of the guild's past is often a part of the stories.
The book I recommend to you is Picking Up a World of Demons. This book fits the plot you provided. The protagonist, Motian, established a guild in the world of the demon's tail and worked hard to make it the strongest guild. At the same time, he also brought the magic in the demon's tail to other worlds. This book had both fantasy elements and an adventurous atmosphere of swords and magic. At the same time, the plot of the main character establishing a guild was also very interesting. I hope you like my recommendation, Mwah ~😗
Sure. There's a fanfiction called 'The Makarov Chronicles'. In this, the author explores Makarov's relationships with different members of the guild in a very detailed manner. It gives a fresh perspective on his character. Also, 'Makarov's Secret Power' is quite engaging as it reveals a hidden power that Makarov has and how it could potentially change the fate of Fairy Tail.
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.