A common theme is often his self - doubt. Natsu is typically confident, but in these fanfictions, he might start to doubt his strength and abilities. This could be due to a major defeat or seeing others surpass him. Another is his relationship issues. For example, a rift with Lucy or other guild members could lead to his depression. It shows how much his relationships mean to him. And sometimes, the theme of feeling powerless against a greater evil or a prophecy can be a part of it, where he's depressed because he doesn't know how to protect his loved ones.
One common theme is Natsu getting angry over the harm or threat to his friends in Fairy Tail. For example, if Lucy were to be kidnapped, Natsu's fiery temper would flare up and he'd go on a rampage to rescue her. Another theme could be his anger towards villains who try to destroy the guild. His anger then drives his determination to fight and protect what he holds dear.
In many 'Fairy Tail End is Natsu' fanfictions, the theme of redemption can be found. Natsu might have to make up for past mistakes or face the consequences of his actions in a more profound way as the end approaches. Another common theme is the exploration of his dragon - slayer heritage. How his connection to dragons plays a role in the final events of the story is often explored. And of course, the theme of unity within Fairy Tail. Natsu is usually at the center of bringing everyone together to face the final threat or to celebrate the end of a long journey.
Often, there is the theme of loyalty. Even in a slave - like situation, Natsu's loyalty to his friends or certain ideals might be tested or emphasized. Also, growth is a theme. He may grow as a character through the challenges he faces in this different status compared to his normal role in the Fairy Tail world.
Common themes in fanfictions about Natsu and Mira from Fairy Tail include growth. Both characters can grow as individuals through their interactions. Natsu might become more mature in how he approaches problems, and Mira could become more confident in her abilities. The theme of family is also there, as the Fairy Tail guild is like a family. Natsu and Mira's relationship within this family - like environment can be explored, such as how they support each other during tough times in the guild or when dealing with personal issues.
One common theme is the 'forbidden love' aspect. Since they are comrades in the guild, some fanfictions play on the idea that their love is something they have to keep secret. Another theme is 'overcoming differences'. Natsu is impulsive while Erza is more disciplined, and fanfictions might explore how they bridge these gaps in a romantic relationship.
Well, a big theme is the growth of their relationship. It doesn't have to be romantic in a sexual way. It can be about how they become closer as comrades. Also, the theme of protecting each other is quite common. Natsu is always ready to protect Lucy, and vice versa, and fanfictions like to play around with this dynamic, showing different scenarios where they safeguard one another.
These fanfictions usually depict Natsu as having a change in his fighting spirit. Instead of being eager to jump into battles, he's hesitant or lacks his usual enthusiasm. He might also have trouble sleeping and eating, just like real - life people with depression. His interactions with his friends become strained, with short answers and less of his trademark banter. He may even isolate himself in his room or a quiet place away from everyone. This shows the toll his depression is taking on his normal, extroverted self.
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.
The theme of legacy also pops up a lot. Natsu's family, especially his dragon father Igneel, had a certain legacy. Fanfictions may explore how Natsu lives up to or breaks away from that legacy. Additionally, the theme of family secrets is quite popular. There could be hidden aspects of his family that Natsu discovers, which changes his perception of his family and himself.
Another theme is adventure. Fanfictions usually involve them going on quests or facing new threats. For example, they might have to explore an ancient, cursed ruin to find a powerful magical artifact. Along the way, their relationship develops as they face challenges side by side, like when they encounter traps or powerful dark mages guarding the artifact.