In some fanfics, other characters might also play a role. For example, Krillin, who was once in a relationship with Android 18. His presence could add an interesting dynamic, like jealousy or a sense of competition, to the relationship between Goku and Android 18.
Android 21 and Goku are the main characters. Android 21 with her android intelligence and power is a key figure. Goku, with his super Saiyan forms and his indomitable spirit, is equally important. Their personalities are so different - Goku is more straightforward and pure - hearted, while Android 21 has a more complex and sometimes morally ambiguous nature. These differences create great potential for conflict and growth within the fanfic.
A possible plot could be that Android 18 gets injured during a fight and Goku takes it upon himself to protect and heal her. This close proximity leads to the development of feelings, which is where the 'lemon' part might come in. Their relationship could be a secret at first as they are from different 'worlds' in a sense, with Goku being a Saiyan hero and Android 18 being an android once created for destruction.
It might also be a story about self - discovery. Android 18 could be exploring her more human side with Goku's influence. Goku, on the other hand, could learn more about the androids and how they are not all just mindless killing machines. The 'lemon' aspect might imply some sort of budding relationship that is full of passion and challenges as they come from very different backgrounds.
Goku Black is a major character. He brings his Saiyan strength and his twisted sense of justice from his own timeline. Android 21, on the other hand, is a character full of mystery. In fanfiction, she often has her own motives and goals that interact with Goku Black's, whether it's to gain more power or to find a place in the world. Other characters might also be involved, like some of the Z - Fighters who could be either allies or enemies in the story depending on the plot.
Maybe in a post - battle scenario, Goku and Android 18 are left alone to recover. They begin to have conversations about their different origins. Goku shares about his Saiyan heritage and training, while Android 18 talks about her creation by Dr. Gero. This exchange could lead to a deeper emotional connection between them.
Obviously, Harry is one of the main characters as it's in the title. He's the android around which the story is likely centered.
Often, it could be new villains created specifically for the fanfiction. Maybe a powerful android created by the same scientist who made Android 21 but with a more evil intent.
Obviously, Goku and 17 are the main characters. Goku, the Saiyan hero with his incredible power and love for fighting. 17, the powerful android with his own set of skills and a somewhat mysterious past.
There could also be original characters created specifically for this fanfic. Maybe a game master who controls all the virtual worlds Goku enters. This character could be a bit of a mystery, with their own motives and backstory, and they interact with Goku in ways that drive the plot forward.
In addition to Naruto and Android 17, there could be other characters involved too. For instance, Sasuke might make an appearance. He could either be in on Naruto's prank or be a bystander who gets caught up in the chaos. Also, some of Android 17's friends or allies from the Dragon Ball universe could potentially show up to see what's going on with him.