In fanfiction, the idea of Mavis and Zeref having a child often leads to very complex and interesting storylines. Some fanfictions might explore the child's powers, which could be a combination of Mavis's magic and Zeref's unique abilities. For example, the child could have an extraordinary control over life and death magic, or possess some form of enhanced intelligence due to their parents' natures.
One possibility is that the fanfiction focuses on the aftermath of the wedding. How their union changes the world of Fairy Tail. Maybe it brings a new era of peace, as Zeref's power, combined with Mavis' wisdom, could have a positive impact on the magical balance. It could also show their life together, how they support each other, and perhaps start a family of their own, with their children having unique magical abilities.
If they were to work towards a common goal, like saving the Fairy Tail guild from a new and powerful enemy. They would have to rely on each other's strengths. Zeref's dark magic knowledge and Mavis's strategic thinking could complement each other. Through this cooperation, they would see each other in a new light and their relationship would improve.
One idea could be that Zeref and Mavis are somehow trapped in a parallel dimension. In this dimension, they have to work together to find a way out. Along the way, they start to understand each other's pasts and the pain they've both endured. This could lead to a newfound respect between them.
It could be a tragic kiss. Given their complex relationship in the Fairy Tail lore, perhaps the kiss is a final goodbye. Zeref, with his dark nature, might be sacrificing himself or being forced to part from Mavis. And this kiss holds all the unspoken words, all the love that could never be fully realized in a normal way because of their fates.
In a fanfiction, their kiss could be the start of a new era in the Fairy Tail story. It could inspire new magic, new alliances, and new enemies. It might also lead to a journey of self - discovery for both Zeref and Mavis. They could learn more about themselves through this newfound connection, and this could ripple out to affect all the other characters and the overall plot of the Fairy Tail world in many different and complex ways.
In fanfiction, their kiss could symbolize a moment of forbidden love. Zeref, with his dark past and power, and Mavis, the founder of Fairy Tail. Their kiss might be a turning point where they bridge the gap between their different natures. It could be a moment of pure emotion, defying all the odds that keep them apart in the original lore.
A possible plot twist could be that Zeref's dark power resurfaces during the wedding. Maybe an old enemy takes advantage of the situation and tries to turn Zeref against Mavis. But Mavis' love and the power of Fairy Tail's friendship save the day.
The concept is often used to explore the themes of redemption and love in fanfiction. The relationship between Mavis and Zeref, which is already very complex, is further explored through their child. The child could be the symbol of a new beginning, a way to break the cycle of hatred and death that Zeref was often associated with. Writers might show how love can overcome the dark legacy of Zeref through the child's character development.
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.