Another possibility is that the kid is from an alternate dimension where time passes differently. Natsu's kid shows up in the Fairy Tail world and he has to figure out how to be a father. The story could focus on their journey to get to know each other and the kid's adjustment to this new world.
One possible scenario could be that the new kid is a huge fan of Natsu and joins Fairy Tail School Academy hoping to meet him. The new kid might be really nervous at first, but then Natsu's warm and friendly personality makes him feel welcome. Natsu could show the new kid around the school, introducing him to all the cool magical things there.
In this kind of fanfiction, the kid might have some unique abilities. Since Natsu is a dragon slayer, the kid could have an enhanced form of dragon slayer magic or a combination of different magics. For example, the kid could have the ability to not only use fire like Natsu but also manipulate wind to make the fire more powerful.
In a fanfiction where Natsu turns into a kid, his personality would likely remain somewhat the same but be more child - like. His impulsiveness could become even more extreme as a kid. He might make new friends more easily among the younger members of the guild. And his love for food would probably stay strong, but he might be more likely to steal sweets like a typical kid. His enemies might underestimate him in this form, which could lead to some interesting battles where he uses his child - like charm and his still - powerful magic to win.
Natsu might get into a friendly competition with the new kid. For example, they could have a race around the school campus using their magic. Natsu would be all fired up to show his skills, but the new kid might surprise him with some unexpected magical abilities.
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.
When Natsu turns into a kid in fanfiction, his character development takes a different turn. He becomes more open to learning from his friends in a child - like way. Instead of always being the tough fighter, he has to be taught how to handle situations. His view of the world becomes more innocent, and this could change how he approaches magic and relationships. For example, he might be more willing to try new types of magic that he thought were too 'girly' or uncool before because he doesn't have the same pre - conceived notions as an adult. This new - found openness could lead to a more well - rounded development in the long run.
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.
Well, Romeo is often depicted as a passionate character. In the context of a fanfic, he might show intense emotions towards Natsu. Natsu, on the other hand, could be shown as strong - willed yet having a soft side when it comes to Romeo. But it really depends on how the author interprets them in the fanfic.
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.