The end might be hated because it didn't tie up all the loose ends properly. In 'Fairy Tail', there were many sub - plots and relationships. If the fanfiction end fails to address these in a satisfactory manner, like leaving a potential romantic relationship in an ambiguous state or not fully explaining a character's growth, fans would be disappointed.
One reason could be that some writers might want to create a more complex or darker storyline. By having Natsu be hated, it adds conflict. Maybe they portray him as having made a big mistake that the other characters in the fanfic can't forgive.
Well, one way is to rewrite the character arcs more carefully. Make sure each character's development is logical and in line with their personalities throughout the story. For example, if a character was known for being brave but was suddenly cowardly at the end, change that to make it more consistent.
Well, 'Fairy Tail Gray Hated Fanfiction' might be a piece of fan - made writing where the author doesn't like Gray's character in Fairy Tail. So they write a story that focuses on his flaws or things they dislike about him. It could involve changing his relationships with other characters in a negative way or creating scenarios where he fails or behaves badly. For example, they might show him being mean to his friends or being too self - centered, which is different from his normal portrayal in the official Fairy Tail series.
Maybe there is a misunderstanding. Since it's a crossover fanfiction, communication between the two different worlds' characters might be difficult. So, Naruto could be misjudged and betrayed because of false assumptions.
One reason could be to add drama. Her death can make the story more emotional and engaging.
One possible reason could be the difference in power systems. Naruto's world has its own unique ninja abilities like jutsus, while Fairy Tail has magic. In some fanfictions, the clash of these two different power concepts might make Fairy Tail fans dislike Naruto being involved. Maybe they think Naruto's abilities are too overpowered or not in line with the magic - based universe of Fairy Tail.
One possible reason could be that he accidentally causes a great deal of destruction during a mission that the guild can't overlook. Maybe he loses control of his dragon slayer magic and wrecks an important building or site, leading to his expulsion as a form of punishment.
One popular 'End Join Fairy Tail' fanfiction might be 'The New Adventure'. It often features new characters joining the Fairy Tail guild and going on unique quests. Another could be 'End Join: The Power Within' which focuses on the development of the joined characters' powers within the Fairy Tail universe.
One reason could be his power. His connection to the Nine - Tails makes him extremely powerful. In fanfiction, some in Konoha might fear this power and thus hate him. Another reason could be jealousy. Naruto becomes very popular and respected in the original story. But in fanfiction, some characters might be jealous of his achievements and turn that into hatred.
One possible reason could be a false accusation. Maybe someone spread a rumor that Naruto was involved in a heinous act, and without proper investigation, everyone turned against him.