Perhaps a plotline where an outside force tries to manipulate Natsu and Zeref against each other while they are in Fairy Tail. This could lead to a lot of internal conflict within the guild as members take sides. But in the end, through the power of friendship and the values of Fairy Tail, they see through the ruse and become stronger together, uniting the guild even more firmly.
If Natsu and Zeref join Fairy Tail in fanfiction, it would change the dynamic of the guild completely. The other members would have mixed reactions. Some might be distrustful of Zeref due to his past actions. However, as time passes, they could see the good in him. Natsu and Zeref together could attract a lot of attention from outside forces. Enemies might target Fairy Tail more because of their combined power. But also, they could inspire the guild to become even stronger, with everyone striving to keep up with their new powerful comrades.
Well, it depends on the specific fanfiction. Some fanfictions do make Zeref and Natsu brothers. This can create some really cool plot twists. For instance, it could change how Natsu views his powers if he discovers he's related to Zeref. And it might also make Zeref more protective or possessive of Natsu in a different way than in the original story. It's a concept that allows for a lot of creativity in the fanfiction world.
One possible plotline could be that the other Fairy Tail members set up a series of pranks on Natsu, like replacing his fire - based spells with something silly, like making his hands shoot out confetti instead of flames. Another could be that they constantly make jokes about his fear of transportation, especially his motion sickness on vehicles.
One common theme is the exploration of their shared past. Since they are brothers in these fanfictions, writers often dig into what their childhood might have been like.
The story could also revolve around how the guild members' relationships change. For instance, Happy might not be as cheerful without Natsu around. And the guild as a whole might become more united in trying to find a replacement for Natsu or trying to figure out how to move forward without him. They could start to explore different parts of the magical world to find new allies or magic that can help them in their battles.
One reason could be that the author wants to create an alternate universe where Natsu has a different path. Maybe in this fanfiction, he has a prior commitment to another guild or group that prevents him from joining Fairy Tail.
One possible plotline could be that Lucy uses her charm and intelligence to plan elaborate schemes to get Natsu's attention. For example, she might invite him on special adventures that are just for the two of them, where she can show off her skills and bond with him more deeply. Another could be that she gives Natsu special gifts that are meaningful to him, like a scarf she made herself which has some magical protection. Or perhaps she starts dressing in a way that she knows Natsu will find appealing, not in a vulgar way but in a way that highlights her beauty and confidence.
One possible plotline could be Natsu trying to prove his innocence. Maybe he was wrongly accused of a serious crime within the Fairy Tail guild, like endangering the lives of other guild members during a mission. He then sets out on a journey to find evidence that clears his name while also facing various challenges and enemies along the way.
It could also be a story about Natsu's personal growth during his exile. Without the support of his Fairy Tail friends initially, he has to rely on his own strength and wits. He might discover new magical abilities or face challenges that test his character, and in the end, he either returns to Fairy Tail as a changed and stronger wizard or decides that his new path outside the guild is better for him.
One plot idea could be that Zeref discovers a way to reverse his curse through Natsu. Since Natsu is his creation, there might be some hidden connection that could be explored. Maybe Zeref tries to use Natsu's unique dragon - slayer magic to break the chains of his dark magic.