Well, Natsu's personality transformation into END in fanfiction is quite interesting. He can become more brooding, spending time alone to figure out his new powers. There's a sense of a darker side emerging. He may not be as quick to trust others as he used to be. For instance, he might question the motives of his guild mates more often. Also, his sense of humor might change, becoming more sardonic or even disappearing altogether in some cases as he grapples with his new identity.
His personality can become more aggressive. Natsu is usually a hot - headed character, but as END, he can be even more so. He might be quicker to anger and less likely to hold back in a fight.
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.
He might become more withdrawn. Since he is used to being liked and part of the group, being hated could make him isolate himself from the others in the guild in the fanfic.
In fanfiction, if Natsu turns into a dragon, his character development would be a journey. He would have to face his own self - doubts. As a dragon, he has more power, but with that comes responsibility. He would need to learn how to control his dragon instincts, like aggression and territoriality. This process would shape him into a more mature character. His relationships would also change. Some characters might look up to him more, while others might question his humanity. Through all these experiences, Natsu would grow and become a different kind of hero in the Fairy Tail world.
Well, Natsu's relationship with Gajeel could be really different. Gajeel might be more respectful towards Natsu as a girl, or he could be more competitive in a different way, like trying to prove that he's the better dragon slayer in a more gentlemanly manner. Natsu's relationship with the guild master, Makarov, would also change. Makarov might be more protective of Natsu as a girl, and Natsu might have to fight harder to be taken seriously in guild matters. In general, all of Natsu's relationships would be reshaped, with new levels of complexity and humor added to the story.
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.
In some fanfictions, when Natsu turns into END, there's often a huge power boost. This can lead to him facing off against stronger enemies that he couldn't before. For example, he might take on the most powerful dark mages single - handedly. His appearance also changes, usually becoming more menacing with features associated with END. This transformation can also cause some internal conflict within the Fairy Tail guild, as some members may be afraid of his new form.
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.
Natsu's character development in this fanfiction might involve him becoming more responsible. With his end form, he has greater power and with that comes the need to use it wisely. He could start to think more about the consequences of his actions. For example, he might not rush into battles as blindly as he used to. Also, his emotional growth could be a part of it. He could become more in tune with his feelings towards his friends, especially Lucy. His loyalty to the guild could also deepen as he realizes his new form can be a great asset to protect Fairy Tail.
He might initially be in disbelief. Natsu is used to the loyalty among his Fairy Tail comrades, so betrayal would be a shock to him.
The story would change a great deal. Natsu's usual brash and bold behavior as a boy might be tempered a bit as a girl. His interactions with the guild members would be different. For instance, the way he flirts with Lisanna might turn into a more sisterly kind of relationship if he's a girl. And his rivalry with other male characters could shift to a different type of dynamic.