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.
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.
Well, obviously Black Goku himself is a main character. He is the center of the story in most cases as his actions drive the plot. Goku also features prominently as he is the one who has to oppose Black Goku. Vegeta is often there too, as he is another strong Saiyan and is eager to take on the threat that Black Goku poses.
One possible storyline could be that Naruto is somehow transported to Goku Black's universe. There, he has to face Goku Black who sees him as an intruder. Naruto would have to quickly learn about Goku Black's powers and find a way to fight back using his ninja skills. Another storyline could be that a powerful villain creates a rift between their two universes and pits them against each other. They start off as enemies but then realize they are being manipulated and team up to fight the real villain.
There could be a storyline where Beerus, out of boredom, decides to train Goku Black instead of fighting him. But Goku Black misinterprets this as a sign of weakness and attacks Beerus. This could lead to a battle where Beerus has to hold back at first to avoid killing Goku Black, but as the fight progresses, he realizes he has to use his full power to subdue him.
One possible storyline could be that Goku Black arrives on Earth in search of a powerful energy source. The Justice League detects his arrival and confronts him. At first, they underestimate his power. Goku Black easily defeats some of the members, but then the League starts to work together and figure out his weaknesses. Another storyline could be that an evil entity has brought Goku Black to the DC Universe to cause chaos and the Justice League has to stop him while also dealing with the entity. Or perhaps Goku Black is tricked into thinking the Justice League are enemies of the Saiyans and he attacks them, only to later find out the truth and have to team up with them to fight a greater threat.
The different interpretations of the characters are great. In some fanfictions, Goku Black might be portrayed as even more evil or cunning than in the original series, and Hit could be shown with new strategies. For instance, a fanfiction might have Hit teaming up with other characters from different universes to take on Goku Black, which adds a whole new dimension to the story.
In fanfiction, the unique aspect of Goku and 18 is their contrasting natures. Goku is a Saiyan, full of energy, always eager for a fight, and has a somewhat innocent view of the world. 18, on the other hand, is an android, created with a more cynical view due to her origin. Their interactions can be really interesting as they bridge these two different outlooks. For example, Goku's positive attitude might start to change 18's more negative perspective over time.
One possible fanfic could be about Goku's intense training before the Cell Games. He might be shown pushing his limits in the Hyperbolic Time Chamber, trying out new techniques and forms to defeat Cell. Maybe he discovers a new power level that no one, including himself, expected.