I haven't read this particular fanfiction yet. But generally, in a scenario where Fairy Tail characters watch Natsu fight Zeref, it could be filled with intense emotions. Natsu's determination and his unique powers would be on full display. And the reactions of the other Fairy Tail members would add depth to the story, whether it's shock, pride, or worry.
Well, in such a fanfiction, it might start with the build - up to the fight. The anticipation among the Fairy Tail members as they know Natsu is about to face Zeref. During the fight, Natsu's dragon - slayer magic would be clashing with Zeref's dark powers. Maybe there are some unexpected twists, like Natsu unlocking a new form or Zeref revealing a hidden weakness. The Fairy Tail onlookers could also play important roles, like providing moral support to Natsu or even interfering at crucial moments.
One possible plot twist could be that Zeref actually doesn't want to fight Natsu seriously and has some hidden agenda. Another could be that Natsu discovers a new power during the fight that is related to his past or his true identity.
One exciting moment could be when Natsu first unleashes a new and powerful attack against Zeref. Maybe it's a combination of his dragon slayer magic and some newfound strength he has gained. Another exciting part might be when Zeref counters with a really dangerous and dark spell that Natsu has to struggle to avoid. And of course, the moment when the Fairy Tail members react with shock or excitement to these powerful exchanges between the two would also be thrilling.
In this fanfiction scenario, one possible thing that could happen is that Natsu's determination to defeat Zeref might be put to the ultimate test. Natsu has always been a fighter with a strong will, and facing Zeref, he would have to dig deep. Zeref, on the other hand, being extremely powerful, might initially have the upper hand. But Natsu could tap into some hidden power, perhaps related to his dragon slayer magic in a new and unexpected way. Maybe he would get some kind of emotional boost from his friends in Fairy Tail who are watching, which gives him the edge he needs to turn the battle around.
Well, it depends on the specific fanfiction. Some fanfictions do make Zeref and Natsu brothers. This can create some really cool plot twists. For instance, it could change how Natsu views his powers if he discovers he's related to Zeref. And it might also make Zeref more protective or possessive of Natsu in a different way than in the original story. It's a concept that allows for a lot of creativity in the fanfiction world.
Obviously, Natsu would be one of the main characters since the fanfiction is centered around him fighting. His friends from Fairy Tail like Lucy, Gray, and Erza are also very likely to be main characters. They would be the ones watching Natsu fight and having reactions to his actions in the battle.
Well, in 'Fairy Tail Watches Natsu Fight Fanfiction', it might be interesting to see how the author builds up the tension before the fight. They could show Natsu's pre - fight rituals or his mental state in a new light. Also, the reactions of the other Fairy Tail members during the fight can add a lot of depth. For example, if Lucy is worried about Natsu but also has faith in him, that kind of emotional interplay can be really engaging.
If Natsu and Zeref join Fairy Tail in fanfiction, it would change the dynamic of the guild completely. The other members would have mixed reactions. Some might be distrustful of Zeref due to his past actions. However, as time passes, they could see the good in him. Natsu and Zeref together could attract a lot of attention from outside forces. Enemies might target Fairy Tail more because of their combined power. But also, they could inspire the guild to become even stronger, with everyone striving to keep up with their new powerful comrades.
One common theme is the exploration of their shared past. Since they are brothers in these fanfictions, writers often dig into what their childhood might have been like.
In some fanfictions, Zeref is portrayed as a more sympathetic character. Instead of just being the big bad, he might be shown as a victim of his own power or circumstances. For example, he could be a character who was forced into doing evil things and actually has a good heart deep down.
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.