One idea could be that in a world where Natsu is female, she and Gray are paired on a difficult mission. They have to work together to defeat a powerful dark wizard. Along the way, they start to understand each other's fighting styles better and develop a mutual respect that turns into a budding friendship. Maybe Natsu's more emotional side as a female adds a new dynamic to their interactions.
Perhaps in the fanfiction, Fem Natsu and Gray are entered in a magical tournament. They initially compete against each other but then realize that they are being manipulated by an outside force. So they team up. Fem Natsu's unique brand of magic, which might be a bit different from the male Natsu, combines with Gray's ice magic in unexpected ways to take on their common enemy.
A really interesting plot could be set in an alternate universe where Fem Natsu and Gray are from rival guilds. But when a greater threat looms over the entire magical world, they are forced to put aside their guild differences. As they train together to face this threat, they find themselves falling in love. Their relationship is a struggle between loyalty to their guilds and their new - found feelings for each other.
A plot could involve Fem Natsu accidentally using her magic in a way that affects Laxus in an unexpected manner. For example, her fire magic could trigger some latent power in Laxus, and as they figure out what's going on, they become closer. This could also lead to some interesting training sessions between them as they try to control this newfound power connection.
One idea could be a story where Lucy discovers a powerful magic that can only be controlled with the combined help of Natsu and Gray. So, they have to put aside their usual rivalries and work together closely. This could lead to some really fun and intense training sessions between them as they try to master this new magic.
One idea could be that Natsu discovers a new and rare type of fairy magic that he has to learn to control. Another could be Natsu getting involved in a fairy war and having to choose a side. Maybe he could also meet a fairy who has the power to grant wishes and he has to decide what to wish for.
One possible plot could be that the kidnappers are from a rival guild who want to use Natsu as leverage against Fairy Tail. Gray could then embark on a solo mission to rescue Natsu, facing various traps and enemies along the way. He might have to use his ice - make magic in creative ways to overcome obstacles.
Well, it depends on the specific fanfiction. Some might have a plot centered around their unique friendship in a different AU (alternate universe), like they team up to fight a common enemy. Others could explore their relationship in a more emotional way, perhaps with Zeref having to deal with her new female form and Natsu being there to support her in ways different from the original story.
One idea could be that they discover the pregnancy during a mission. Maybe they are in the middle of fighting some powerful enemy when Erza suddenly feels unwell and realizes she might be pregnant. It could add a whole new layer of drama to the story, with Gray being overly protective.
One idea could be that they face challenges in preparing for the baby, like finding a suitable home. Maybe they have to deal with family reactions, both positive and negative. Another could be that during the pregnancy, they discover new things about each other's pasts.
A plot could involve Anakin discovering an ancient Gray Jedi artifact. This artifact holds the secrets of a long - lost form of Force - using that is neither fully light nor dark. As he delves into its mysteries, he has to fight off those who want to use it for evil purposes.
One idea could be that Ultear and Gray are on a mission together in a mysterious land filled with magical creatures. Along the way, they discover a hidden lemon grove that has some special magical properties related to their powers.
Maybe Gray has to team up with a dragon in order to defeat an ancient evil that threatens to destroy the world. The dragon could have its own motives and Gray has to figure out if he can trust it.