A good exploration of their personalities is key. Since they both have distinct traits, seeing how they interact based on who they are is important. For example, Zamasu's self - righteousness and Black's more primal power.
Character interaction is crucial. You want to see how Percy's powers and his more heroic, sometimes naive nature interact with Black Widow's spy skills and her more cynical world view. For example, in some fics, Percy's loyalty clashes with Black Widow's more self - serving spy tactics at first, creating interesting tension.
A common theme is power - seeking. They are often depicted as constantly striving for more power and ruling over the universe. Another theme is their unique bond, whether it's a friendship or a more sinister partnership.
The magical world building is also important. A good fanfiction will incorporate the rich lore of the Harry Potter universe. For example, how the use of magic is involved in their relationship, like Sirius teaching Harry a new spell or them using magic to solve a mystery together. And of course, the story should stay true to the overall tone of the original series, which is not adult - themed but rather about adventure, friendship, and the fight between good and evil.
One idea could be exploring their relationship in an alternate universe where they succeed in their plans. Another could be a story where Goku Black has a change of heart due to his connection with Zamasu and tries to stop their destructive ways. Maybe a plot where they face a new enemy that forces them to reevaluate their alliance.
One idea could be that they discover a new realm together and have to face an unknown threat there. Their combined power might be put to the test in ways they never expected.
Another option for the main antagonist could be Beerus. As a God of Destruction, he wouldn't be happy with Zamasu and Goku Black causing chaos. Beerus is extremely powerful and has the authority to deal with threats to the universe. He might see their actions as a direct challenge to his power and order. If he gets involved, he could completely change the dynamic of the story, as his power level is on a whole different scale compared to most characters in the Dragon Ball universe.
There's also 'Zamasu and Black: A Forbidden Bond'. This fanfiction focuses on the more emotional side of their relationship. It shows how they might have come to understand each other on a deeper level, despite their differences. It's really well - written and the characterizations are on point.
Well, one important thing is the consistency of Sasuke's character. He has his own set of values, goals and abilities in the Naruto universe. In a crossover, these should be maintained while also being adaptable to the new setting. For instance, in a Sasuke x Bleach crossover, his Sharingan abilities might have new interpretations or uses in the Soul Society. The pacing of the story is also crucial. It should neither be too slow that it bores the reader nor too fast that important details are missed. And the conflict, whether it's internal within Sasuke as he struggles with the new world or external as he faces new enemies, should be engaging.
Well, a good character for the OC is key. It should be someone relatable or with an interesting backstory. For example, an OC who is an aspiring singer and meets Monsta X at an audition. Also, the relationship dynamics between the OC and the members. It could be a friendship, a romantic relationship, or just a mentorship. And of course, the plot. It should be engaging and not just rely on the presence of Monsta X.
Characterization is key. Since it's about an OC (original character), you want to see a well - developed shota character with unique traits, dreams, and flaws. The relationships in the story also matter a great deal. How the shota OC interacts with other characters, whether it's friendship, mentorship, or something more complex, can make or break the story.