One common theme is the anticipation and excitement within the story's community about the new life. Another could be the challenges Natsu faces during the pregnancy, like dealing with her own powers or how her daily life is affected.
Well, family is a big theme. Since Lucy is pregnant with Natsu's child, it's about them starting their own family within the Fairy Tail family. Love and protection are also common. Natsu would likely be very protective of Lucy and the unborn child, showing a deeper side of his love. And sometimes, there's the theme of sacrifice, like Lucy might have to sacrifice some of her adventures for the sake of the baby and Natsu might have to change his carefree ways to be more responsible.
One common theme is the anticipation and excitement of starting a family. It often shows how Natsu and Levy prepare for the arrival of their baby, like setting up the nursery or choosing baby names.
One major theme is the reaction of the Fairy Tail guild. Usually, in these fanfictions, the guild members are super excited and offer all kinds of help. They might throw baby showers or give advice based on their own experiences. Also, the theme of family is strong. Natsu and Lucy start to see themselves as a family unit, and they think about how to raise their child in the Fairy Tail way, with values like loyalty and friendship.
Love is a very common theme. Since they have a pre - existing relationship in the original story, fanfictions often expand on their romantic feelings for each other. Another common theme is friendship. Their friendship is the foundation of their relationship, and many fanfictions explore how their friendship evolves into something more.
One common theme is friendship. Since they are both part of the Fairy Tail guild, many fanfictions explore the deepening of their friendship over various adventures. For example, they might go on a mission together and learn more about each other's strengths and weaknesses, which in turn strengthens their bond as friends.
Friendship is also a big theme. Naruto values his friends deeply, and Natsu is the same in his own way. Fanfictions usually explore how their friendship would develop if they met. They would likely bond over their shared love for a good fight and protecting their loved ones. For example, they might team up against stronger enemies that neither could face alone.
A frequently seen theme in Natsu and reader fanfiction is the power dynamic. Natsu is a powerful mage, and depending on how the writer portrays the reader, there can be an interesting exploration of how their powers or lack thereof interact. Also, the theme of loyalty is quite common. Natsu is loyal to his friends, and this loyalty can extend to the reader in these stories, creating heartwarming moments.
One common theme is power. Since Natsu is a dragon, the fanfictions often explore the extent of his power and how he uses it. Another theme is identity. Natsu has to figure out who he is as a dragon in relation to his human side.
Family is a common theme. Natsu building a family with his partner and all the joys and challenges that come with it.
Another theme is growth. Fanfictions may show how Natsu and Erza grow as individuals and as a pair. For example, they could face challenges that force them to become stronger both physically and emotionally, and their relationship evolves as they overcome these obstacles.