The concept of time distortion is a major theme. In chaos time, time may not flow as it should. This can lead to characters experiencing events out of order or having to deal with the consequences of actions that haven't happened yet in the normal timeline. Another common theme is the struggle for survival. The chaos makes the world a more dangerous place, and characters have to fight to stay alive and protect their loved ones.
One common theme is redemption. Since Pain is often seen as a villain in his original context, many fanfictions explore his path to redemption within the Fairy Tail world.
One common theme is redemption. Since Silver has a complex past, many fanfictions explore his journey towards redeeming himself. Another theme is friendship, as he is part of the Fairy Tail guild, and his relationships with other members are often explored.
Another theme is power. Since both Touka and Fairy Tail characters have their own powers, fanfictions often explore how Touka's power can interact with or be enhanced by the magic in Fairy Tail. It could be that her unique abilities are combined with Fairy Tail magic to defeat a powerful enemy.
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.
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.
One common theme is loss. Maybe Lucy loses a dear friend or a precious magical item in the fanfiction, which makes her sad. Another theme could be unrequited love. For example, if she has feelings for someone who doesn't return them, it would cause her sadness. Also, failure in her missions or not being able to protect her friends can be a theme that leads to her being sad in these fanfictions.
One common theme is the test of Erza's strength. In many fanfictions, she endures torture as a way to show how strong she is both physically and mentally. For example, she might be captured by enemies who try to break her will through various forms of torture, but she always manages to hold on. Another theme could be the development of her relationships. The torture she endures can make her friends or comrades realize how much they care about her, leading to deeper emotional bonds.