It would change the story a great deal. Natsu having a child means there's a new generation to consider. His child could potentially inherit his magic or even have a new and unique magic ability. This could lead to new plotlines where the child is in danger and Natsu has to use all his power to save them. Or perhaps the child could be a key to solving some big mystery in the Fairy Tail world.
The guild would become more protective. Members like Gray and Lucy would probably offer their help in various ways, like helping with baby - proofing their living quarters or giving advice on parenting. It would also add a more family - like atmosphere to the guild. There would be more anticipation and excitement for the new arrival.
One possibility is that their child inherits Natsu's dragon - slayer magic and Lucy's celestial spirit magic. Maybe the child uses this unique combination to protect Fairy Tail from a new, powerful enemy.
If Natsu is a girl in this fanfiction, her character might change in terms of her relationships. For instance, she may be more self - conscious about her appearance compared to when she was male. Also, her interactions with male characters like Gray could shift. Instead of their typical rival - like banter, there could be a more complex emotional undertone, like a friendly - rivalry with a hint of romantic tension perhaps.
Well, if Natsu had the Sharingan in a fanfiction, it would likely enhance his combat abilities significantly. He could predict his opponents' moves more accurately, similar to how Sasuke uses it in Naruto. This would make him even more formidable in battles against strong foes in the Fairy Tail world. Maybe he could use it to analyze magic spells and find their weaknesses faster.
One way is through the child's magic. If the child has a magic related to entropy, it could be shown as a force that is hard to predict. For example, the child might not be able to fully control when they use their entropy magic, and it could randomly affect things around them, like changing the temperature or the state of objects in the guild hall.
Their family dynamic would likely be full of energy. Natsu's exuberance and Erza's strong - willed nature would create a lively household. Natsu would bring a sense of fun and adventure, while Erza would enforce discipline and order when needed.
Natsu could also become more vengeful in such fanfiction. If he is constantly being abused, his normally positive attitude might turn into a desire for revenge against those who wronged him. For instance, instead of trying to resolve things in a friendly way like he usually does in the original series, he might be more inclined to use brute force and be less forgiving. This is a big change from his character in the official Fairy Tail story where he values friendship and forgiveness.
The story would have to shift its focus. Instead of relying on Natsu's dragon - slayer magic and Mirajane's take - over magic, new characters or existing ones would need to shine. This could open up new plotlines such as the discovery of new magic among the remaining members or the forging of new alliances outside of the guild to compensate for the loss of Natsu and Mirajane. It would be a major turning point in the fanfiction's narrative.
It would be a wild change. Naruto's Rinnegan powers would make him a major force in the Fairy Tail world. He might be able to use the Preta Path to absorb magic attacks, which would be a huge advantage. And his Deva Path could manipulate gravity in ways that are unheard of in Fairy Tail. This could lead to new alliances or rivalries. Maybe some Fairy Tail members would be in awe of his power and want to learn from him, while others might be jealous or afraid.
In fanfiction, the relationship between Natsu and Erza's child and the other Fairy Tail members would be quite diverse. The child would be part of the Fairy Tail family. Wendy would be like an older sister, helping the child with their magic and always being kind. Cana might teach the child some of her card tricks and gambling skills in a more innocent way. Elfman would be the one to encourage the child to be manly, and Evergreen would be that strict but caring mentor figure. They'd all contribute to the child's growth and development within the guild.