One idea could be that in fanfiction, Natsu's Dragon Form could have unique fire abilities. For example, he might be able to create different shapes of fire, like a dragon made entirely of fire that can attack enemies on its own. Another could be that his Dragon Form has a connection to an ancient magic that gives him the power to heal other dragons or dragon slayers.
A great idea for Natsu's Dragon Form in fanfiction is that he could have a special form within his Dragon Form. When he reaches a certain level of rage or power, his Dragon Form transforms into an even more powerful state. In this state, his scales could turn a different color, like a deep blue, and his fire could have a freezing effect, adding a new dimension to his combat abilities.
Well, in many Fairy Tail Natsu Dragon Form fanfics, we often see an expansion of Natsu's powers. Some fanfics might explore his new abilities in more detail, like how he can control different types of dragon magic that he couldn't in the original series. It's really exciting to read about his enhanced combat skills and the unique ways he uses his dragon form.
One interesting concept could be Natsu's enhanced power levels. In end form, he might have new and more powerful fire-based attacks. For example, he could create a massive inferno that not only burns but also has some kind of special effect like nullifying dark magic in the fanfiction world. Another concept could be his appearance. Maybe he has a more mature and fierce look, with his hair changing color slightly or his eyes glowing more intensely. Also, his relationships with other characters might be developed further. His bond with Lucy could become even stronger, and they could have new adventures together where his end form is crucial for their success.
One interesting plotline could be Natsu discovering new dragon powers that are unique to him. This could lead to him having to learn how to control these powers and facing challenges within the Fairy Tail guild as others may be wary or envious of his new abilities.
One idea could be that in a post - Dragon Cry adventure, Natsu and Lucy are sent on a mission to a hidden island where ancient dragon magic is said to be sealed. Along the way, they face various obstacles that test their bond, like a powerful sorcerer who tries to split them up. Another plot could involve Natsu losing his dragon slayer powers temporarily, and Lucy having to protect him while they search for a way to restore his powers using the knowledge from the Dragon Cry incident.
A great fanfiction concept could be centered around Team Natsu getting magically separated. Natsu ends up in a realm where there's no fire magic, and he has to learn to adapt and find a way back to his friends. Gray could be in a world of eternal ice and has to find a way to break free. Lucy might be in a place where celestial spirits are feared and hunted, and she has to protect them while trying to reunite with the team.
One idea could be exploring Natsu's struggle to control his dragonized form. Maybe he accidentally dragonizes at an inopportune time and has to deal with the consequences, like scaring his friends or causing destruction. Another could be a scenario where he dragonizes to save the guild from an extremely powerful enemy that no one else could defeat.
Perhaps Natsu has a secret friendship with a character from another guild. They meet in secret and exchange valuable information or magic items. This could add an interesting layer to his character. Also, what if Natsu secretly has a connection to a powerful and ancient dragon that no one in the guild knows about? It could lead to some epic storylines.
Maybe in the fanfiction, Natsu has a different backstory. Instead of being raised by Igneel, he could be raised by a dark wizard, which would make his character more morally ambiguous and lead to a whole new set of story arcs where he struggles between the dark influence and the good in his heart like the relationships he forms with the Fairy Tail members would be very different as they try to sway him to the side of good.
In fanfiction, Natsu's Dragon Form could be developed to have a symbiotic relationship with other characters. For example, he could combine his power with Lucy's Celestial Spirit Magic in a way that enhances both of their abilities while in his Dragon Form. This would create unique and interesting battle strategies.
One idea could be that Natsu gains the power to manipulate time on a small scale. For example, he could slow down time for his opponents in battle, giving him an edge. This would add a new and exciting dynamic to his fighting style.