Well, time - travel is a theme that pops up. Imagine Natsu going back in time and meeting a younger Zeref, which could change the course of their relationship. Then there's the theme of power - sharing or power - swapping. What if Natsu somehow got a part of Zeref's power or vice versa? It would make for a really exciting fanfiction. And of course, there are those fanfictions that focus on their battles, but with unique twists like fighting in a dream world or a world where magic rules are completely different.
Some common themes are redemption and forgiveness. Given Zeref's actions in the original Fairy Tail series, fanfictions might delve into whether Natsu could be the one to bring about Zeref's redemption. Family also plays a role. With their shared history, fan stories could explore the idea of them being part of an unexpected family or having a brotherly bond in a different way than what's shown in the official story.
If you want the clearest chapter reference, go to Chapter 37. Early on, The barrage was suddenly filled with hahas, but the two guests present...; later, the chapter leans on He Yun spent most of her time filming movies, had no interest in variety....
Look to Chapter 19 for the clearest answer. It begins with What criminal law is this or that, this was originally none of your..., keeps building through In high school, she got into the international class by throwing money..., and lands on Please give me Miss Su's birthdate." Mr..
Chapter 35 is the strongest chapter-level answer because it starts from Shining Transformation Trip's filming location was set on the distant... and follows through on Brother is really hardworking, actually arriving at the same time as the....
If you want the clearest chapter reference, go to Chapter 53. Early on, Night had fallen over Chixia Village, eerily void of any human sounds.; later, the chapter leans on Jiang Li followed the village chief's wife down a narrow path leading to....
Chapter 922, "The Good Deed You Did!", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. Early on, Jiang Li skipped through those comments and called Zhao Lang back..
A practical answer is Chapter 28, because it turns the idea into a concrete scene. The chapter opens with The next evening, Jiang Yan drove home seething with rage., adds pressure through Fuck, who's there, standing in the middle of the night scaring the shit..., and ends on Lili then kicked his.
A practical answer is Chapter 73, because it turns the idea into a concrete scene. The chapter opens with Director Sun, tongue-tied, finally managed to squeeze out a sentence,..., adds pressure through Her favorite food is rouge goose, her favorite amusement is Dancing Gun,..., and ends on Despite.
Chapter 15 is the strongest chapter-level answer because it starts from Jiang Shixu woke up from those nightmares filled with blood and darkness,... and follows through on Since she didn't move, Jiang Shixu also stayed put, and the kitchen, which....
A practical answer is Chapter 33, because it turns the idea into a concrete scene. The chapter opens with Following the announcement, five artists respectively reposted the Weibo—..., adds pressure through With a sister looking like that, how good can he look?], and ends on Although Su Yinwan was.
The best chapter pointer here is Chapter 16, "He Actually Fell Asleep". It opens with Just as the words fell, Jiang Shixu swiftly cast his eyes downward. and closes on Jiang Shixu panicked, set down the bowl, and reached forward to grab her....