What are some interesting concepts in 'Fairy Tail Natsu End Form Fanfiction'?

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.

Well, in 'Fairy Tail Natsu End Form Fanfiction', a possible interesting concept is his battle strategies. Since he's in an end form, he might have to learn to control his newfound power. This could lead to him developing more complex and effective ways of fighting. He could start using his fire in combination with the environment in ways he didn't before. For instance, if he's in a snowy area, he could use his fire to create steam and then use that as a cover or a weapon. And his interactions with the guild could also change. The other members might look at him with a new level of respect or even fear, which would add an interesting dynamic to the story.