Perhaps a plotline where Superboy has some sort of identity crisis, and Black Canary is there to guide him. She has experience with mentoring young heroes, and she could help Superboy understand his place in the world, whether he's more human or more Kryptonian, and how to embrace both sides of his heritage.
A plotline could involve Black Canary having to protect Robin when he's in a vulnerable state. Maybe Robin gets injured during a mission and Black Canary takes it upon herself to keep him safe while also trying to figure out who targeted him. This would explore their dynamic as she has to be both a protector and a detective of sorts, and Robin has to learn to trust her completely in this situation.
Black Canary is also very interesting. Her strong will and her ability to use her sonic scream both in combat and for communication are great elements to explore in fanfiction. She can be a mentor figure, a tough fighter, or a character with a lot of emotional depth.
One great story could be about Black Canary training Superboy to better control his strength. In this fanfiction, she might use her martial arts expertise and sonic scream abilities to help him focus his power. For example, during a sparring session, she shows him how to use his speed and strength in a more calculated way.
A great plotline could involve Superboy and Superman teaming up against a powerful new villain that neither could defeat alone. They would have to learn to work together and trust each other fully. This would show their different fighting styles and how they complement each other. For example, Superman's experience and calmness in battle could balance out Superboy's more impulsive nature.
Superboy is often brash and impulsive, while Black Canary is more level - headed and experienced. In fanfiction, their personalities can clash at first. For example, Superboy might rush into a fight without a plan, and Black Canary would have to reel him in. But over time, they can learn from each other. Superboy could learn to think before acting from Black Canary, and she could be inspired by his fearless nature.
One idea could be exploring the clone's struggle to find its own identity apart from Black Canary. It might start off believing it has to be exactly like her but then discovers unique qualities within itself.
One interesting Young Justice Superboy fanfiction could be about his struggle to fit in among the heroes. He has his own unique origin and powers, and a story could explore how he overcomes the feeling of being an outsider. Maybe he forms a special bond with another character like Miss Martian, and they help each other grow.
A great Young Justice Black Canary fanfiction might focus on her powers. It could show her using her Canary Cry in unique ways during battles. Also, it could explore her personality traits further. For example, her strong sense of justice and how she instills that in the young heroes she works with. Fanfictions are a great way to expand on what we already know about the character.
Character development. A good fanfiction would develop Black Canary further. For example, showing her growth as a mentor over time. It could also have a great plot that ties in with the Young Justice universe. Maybe a new threat emerges and she has to lead the young heroes in a different way.
A possible plot is that Superboy discovers a hidden vampire community in his city. The vampires are being hunted by a group of anti - vampire vigilantes. Superboy has to decide whether to side with the vampires or the vigilantes. If he sides with the vampires, he'll have to protect them from the vigilantes who think all vampires are bad. And if he sides with the vigilantes, he'll be going against his own sense of justice because he'll learn that some of the vampires are just trying to live peacefully. Another plot could be a vampire using their powers to manipulate Superboy's mind, but Superboy's strong will eventually breaks free, and then they form an unlikely alliance.