Naruto would probably change the guild's values to be more like those in Konoha. There would be a stronger emphasis on loyalty and protecting the guild at all costs. He might also bring in the concept of having a village - like support system within the guild, where members look out for each other more closely.
As the founder, Naruto would bring a whole new style of combat. His ninja techniques would be incorporated into the Fairy Tail's combat strategies. Also, the guild's hierarchy might change. Instead of just having masters and regular members, there could be a more structured system like in Konoha, with different levels of responsibility and leadership based on a member's skills and experience. This would make the guild more organized and efficient in handling threats and missions.
One change would be in the training regime. Naruto could introduce more intense physical training similar to what ninjas do. This would make the Fairy Tail mages stronger physically as well as magically.
He would bring his unique ninja skills. For example, his shadow clone jutsu could be adapted into some kind of magic - like ability in the Fairy Tail world. His strong sense of loyalty and friendship would also influence the Fairy Tail members. He might inspire them to be more united and fight more fiercely for each other.
As a Yonko, Naruto would change the power dynamics in the One Piece world. His relationships with other Yonkos would be different. He might try to form alliances based on mutual respect rather than just power. His presence could also lead to more cross - cultural exchanges between the ninja world he comes from and the pirate world, resulting in new technologies and ideas being shared.
In fanfiction, Naruto could become the founder of Fairy Tail by having his unique ninja skills and values influence the creation of the guild. Maybe he travels to the Fairy Tail world and decides to gather like - minded mages. His leadership skills, learned from being a ninja, would help him in setting up the guild's rules and training methods.
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.
Naruto joining Blue Pegasus in fanfiction would change their perception of power. His chakra - based abilities are different from the magic they use. This could lead to new research within the guild on combining different power sources. Moreover, Naruto's backstory of being an underdog and rising to be a hero would be a great motivation for the guild members who might be facing their own challenges.
He would change the culture. Naruto is all about hope and believing in oneself. So, in Amegakure, he'd start campaigns to boost the self - esteem of the villagers. Simple things like public speeches about the potential of every individual could have a big impact. He might also change the color scheme of the village to something more positive, as a symbolic change.
I'm not entirely sure who the single 'true founder' is as there are likely many early contributors. However, it could be someone who was among the first to start writing and sharing Fairy Tail fanfiction in a more organized or popular way within the fandom.
One possible storyline could be Natsu founding Fairy Tail after a great battle where he realizes the need for a guild that stands for true friendship and strength. He then gathers like - minded mages and builds the guild from the ground up.
I'm not sure who 'natsu' specifically is as the founder of Fairy Tail fanfiction. There could be many people creating fanfiction and using the name Natsu in their works. It might be a self - given title by an individual within the fan community.
One big change would be in the area of teamwork. Naruto is all about teamwork, as seen in his many battles with his comrades. In High School DxD, the students could benefit from his teachings on how to work together effectively. He could also bring a more carefree and fun - loving attitude to the school environment, which is often filled with serious power struggles.