In some fanfictions, Acnologia is made out to be Natsu's father. But this is not part of the original canon of the Fairy Tail series. Fanfiction writers often like to create such unexpected family relationships to add new twists to the story.
Yes, there are likely fanfictions out there with such a concept. Fanfiction platforms are full of creative and often wild ideas. You can check major fanfiction websites like FanFiction.net or Archive of Our Own (AO3). Just search for the relevant tags or keywords to find them.
It could be a wild mix of the Naruto and Fairy Tail universes. Maybe Naruto's ninja skills would be passed on to Natsu in some unique way. There could be epic battles with Natsu using Naruto - style jutsu.
Natsu could inherit the ability to use chakra. This would give him an extra edge in combat, allowing him to perform jutsus like Naruto. Maybe he could even learn the Rasengan, which he could combine with his fire magic for a super - powerful attack.
In a fanfiction about the return of Natsu's foster father dragon, perhaps the dragon returns with a mission. He might have learned of a great threat during his time away and has come back to enlist Natsu's help. This could involve traveling to new and dangerous lands, encountering unique magical creatures, and Natsu having to prove himself once again to his foster father. The story could explore their relationship, which may have some strain due to the long separation.
Well, in such a fanfiction, their relationship might start off with Natsu being in awe of Naruto's powerful abilities. Naruto, being a father, would likely try to teach Natsu about his own ninja skills. They could bond over training sessions, with Naruto passing on his wisdom about perseverance and friendship. Natsu would probably be eager to learn and might even combine his own magic with Naruto's ninja techniques in creative ways.
The plot could be that the dragon's return disrupts the current peace in Natsu's world. Maybe the dragon has some unfinished business with an old enemy, and now that he's back, he drags Natsu into it. Natsu, being loyal to his foster father, follows him into this new conflict. This could involve a lot of action - packed battles and some emotional moments as Natsu has to deal with the potential danger to his foster father.
I'm not sure who exactly Natsu is just from 'natsu reads fanfiction'. It could be a normal person who just enjoys reading fan - made stories. Maybe it's a nickname for someone within a particular fan community.
In the 'natsu went mia in war fanfiction', Natsu is presumably a central or important character. He could be a hero - type figure who was expected to play a significant role in the war. It's possible that he has some special abilities or traits that made his presence crucial. Since he went MIA, the whole story might be about his friends or allies trying to find him or dealing with the aftermath of his disappearance. It could also be that Natsu is a character with a complex backstory, and his going missing in action is a key event that will unfold and reveal more about his past, his relationships, and the overall world of the fanfiction.
He could marry an original character created specifically for the fanfiction. This character could be a powerful mage from a far - off place who crosses paths with Natsu during one of his adventures.