One way could be by having Gogeta arrive in the Fairy Tail world through a magical portal. Maybe he's on a quest in his own universe and gets accidentally transported to the Fairy Tail realm. He could then interact with the Fairy Tail guild members, perhaps even joining them on some of their adventures and using his unique powers to help out.
First, decide which universes or characters you want to crossover with Gogeta. Then, think about the plot. It could start with a disruption in the Dragon Ball universe that leads Gogeta to another world. For example, if it's a crossover with the One Piece universe, it could be a mysterious energy that pulls Gogeta to the Grand Line.
First, you need to have a good understanding of the characters. Know their personalities, their powers, and their relationships. For example, Gogeta is the result of Goku and Vegeta's fusion through the Fusion Dance, and Vegito is from the Potara earrings. This knowledge helps in creating believable scenarios for them.
They often interact as powerful allies. They respect each other's strength since they are both the result of fusing two extremely strong Saiyans. For example, they might exchange fighting techniques or strategies.
One aspect of Vegito and Female Gogeta fanfiction could be the exploration of their unique power combinations. In these fanfictions, writers might create scenarios where they team up against a powerful enemy. For example, they could face a new, extremely strong villain that neither could defeat alone. Their combined strength and different fighting styles would make for an exciting story.
One common theme is the power dynamic. Since Gogeta is very powerful, female characters in the fanfiction might either be in awe of his power or strive to match it. For example, a female Saiyan could train hard to be as strong as Gogeta.
Another theme is the exploration of power. Since Gogeta is extremely powerful, in these fanfics, the female character might either be in awe of his power or strive to match it. For example, some fanfics show the female character training hard to reach Gogeta's level of strength.
One common theme is the exploration of their relationship, whether it's a friendship or something more complex. Another theme is the role of Bulma in Gogeta's more action - packed world. For example, in some fanfics, Bulma uses her intelligence to help Gogeta in battles. Also, the idea of how their two different personalities interact is often explored.
First, know the characters well. Understand their individual powers, personalities, and backstories. This will help you create believable interactions between them. For example, Vegito might be more serious and calculated, while female Gogeta could be more impulsive and energetic. Second, come up with an engaging plot. It could be a battle - centered story or a more character - driven one about their relationship development. Third, use vivid descriptions to bring the story to life, especially when they are in combat or having an important conversation.