Exploration of new worlds is another theme. Zeref's crossovers allow the readers to explore different fictional universes through his eyes. Whether it's a post - apocalyptic world or a high - fantasy kingdom, the fanfiction often delves into the unique aspects of these new worlds and how Zeref adapts to them. This can be really exciting as it combines the familiar elements of Zeref with the new and unknown elements of the crossover world.
One common theme is power struggle. Since Zeref is a very powerful character, when he crosses over into other universes, there is often a struggle for power with the existing powerful entities in those worlds. For example, in a crossover with a superhero universe, Zeref's dark magic might clash with the superpowers of the heroes.
One common theme is the power struggle. Zeref is extremely powerful, and Lucy has her own unique powers. Their relationship often involves how they deal with the power differential. For example, in some fanfictions, Lucy has to learn to hold her own against Zeref's overwhelming power.
One common theme is redemption. Many fanfictions explore the idea of Zeref being redeemed through his interaction with the female character. For example, the female might show him kindness or love that he has never experienced before, leading him to question his evil ways.
A lot of these fanfictions also have a theme of redemption. Fem Zeref might be portrayed as a character seeking redemption for past actions, and Natsu could be the catalyst for that change. It's a way to give a new perspective to Zeref's character. Additionally, themes of friendship or unrequited love are also common. The relationship between Natsu and Fem Zeref can be explored in a platonic or romantic way, and often there are misunderstandings and moments of self - discovery related to these feelings.
Common themes include the power of love to change a person. Zeref, with his dark past and powers, could be changed by Lucy's love. Also, there's the exploration of destiny. Some fanfictions might suggest that they are fated to be together despite all the odds. Additionally, the theme of self - discovery can be present. Through their relationship, both Zeref and Lucy might learn more about themselves and their true desires.
The exploration of different worlds is also a common theme. Naruto is from the Hidden Leaf Village in his ninja world, and Zeref is from the Fairy Tail world. Fanfictions might have them travel between these worlds, comparing and contrasting the cultures, magic systems, and social structures. This not only adds an element of adventure but also helps in understanding how their characters would react in different environments. For instance, Naruto might be shocked by the prevalence of magic in Zeref's world, while Zeref could be intrigued by the ninja way of life.
One common theme could be power and its consequences. Zeref in Fairy Tail has a complex relationship with power, and 'Familiar of Zero' also has elements of power struggles. Another theme might be the exploration of different magic types. Since both series have their own magic systems, fanfiction could blend and compare them. For example, the dark magic Zeref wields and the magic used in 'Familiar of Zero' could be contrasted or combined.
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.
One common theme is redemption. Since Zeref has a dark past, the kiss could be a step towards his redemption. Mavis, being a more positive character, might be the catalyst for this change through the kiss.
Another theme could be the power dynamics between them. Zeref is a very powerful character, and Roubaul also has his own abilities. Fanfics might explore how a female version of Zeref would interact with Roubaul in terms of power, whether it's cooperation, competition, or something in between.
There's also 'Zeref Meets the Avengers'. This fanfiction takes Zeref out of his original universe and has him interact with the superheroes of the Avengers. It creates some really cool battle scenes and unique character interactions.