One interesting story could be about Black Goku's origin in a different universe where his transformation into an evil Saiyan had a more complex backstory involving a corrupted wish on the Dragon Balls. It might explore how his actions in that universe led to him crossing over into the main Dragon Ball Z universe.
Some fanfictions might focus on the relationship between Black Goku and Zamasu in more depth. It could show how their partnership evolved and what made them so determined to carry out their 'Zero Mortals Plan'. It might also explore the inner thoughts of Black Goku as he battles the Saiyans, his former brethren, and how he justifies his actions.
One interesting fanfiction could be about Goku and Black Goku teaming up against an even greater threat from another universe. In this story, they might initially be at odds but gradually learn to work together, using their unique abilities to save the multiverse.
One interesting story could be where Goku and Bulma go on an adventure together to find a new Dragon Ball. In this fanfiction, they face many challenges and along the way, they start to realize their feelings for each other are deeper than just friendship. It shows a different side of their relationship compared to the original series.
One interesting fanfiction could be where Bulma and Goku have to team up to save the world in a unique way that wasn't shown in the original series. Maybe they have to travel to a different dimension together and face new enemies.
One great DBZ Goku Black fanfiction is 'The Blackened Saiyan'. It explores an alternate universe where Goku Black's reign of terror takes some unexpected turns. The story delves deep into his character, showing his motives and how the other Z - fighters react to his presence. It has some really intense battle scenes that are well - written.
Another factor is the plot. It needs to be engaging. Maybe it could explore Goku Black's origin in a new way or have him face off against the Z - fighters in creative battles. A fanfiction that has a good balance between action, character development, and plot twists can be really great. For instance, if it shows how Goku Black's actions affect the different planets in the Dragon Ball Z cosmos, that would add depth to the story.
In some fanfics, Goku and Android 18 could start as rivals but gradually develop a mutual respect and then an unexpected friendship. This could lead to them training together and learning from each other's fighting styles. For example, Goku could teach 18 some of his Saiyan techniques, and 18 could show Goku her precise and calculated combat moves.
In fanfiction about Goku and Goku Black, a common concept is the alteration of their power levels. Writers may give Goku new forms or boost Goku Black's abilities in unexpected ways. There can be stories centered around Goku Black's adaptation to the main timeline's culture and society. For example, he might have to deal with the everyday life in addition to his evil plans. And there are fanfictions that focus on the psychological impact of their battles on each other, like how Goku might be affected by constantly facing an evil version of himself.
Another plot could involve Female Cell having a premonition of a great threat to the universe. She approaches Goku because she believes his power and pure heart can help. Together, they embark on a journey to find the source of this threat. Along the way, they face various challenges that force them to rely on each other, leading to a growing bond between them.
A more emotional storyline could be that Caulifla gets injured badly in a fight. Goku then takes it upon himself to nurse her back to health. During this time, they have deep conversations about their lives, their love for fighting, and their dreams. This could lead to a new level of respect and friendship between them.
One interesting plot could be that in an alternate universe, Goku and Female Vegeta team up to face a new and powerful enemy. Their different fighting styles, Goku's carefree yet determined approach and Female Vegeta's proud and tenacious nature, would create an interesting dynamic during battles. They might start off not getting along well due to their pride but gradually learn to respect and rely on each other as the threat becomes greater.