First, you need to develop your sidekick character. Decide on their powers, personality, and backstory. For example, if they have a sonic - based power like Black Canary, how is it different? Then, think about the plot. It could start with the sidekick's recruitment by Black Canary.
There might be a fanfiction where the sidekick has to step up in Black Canary's absence. Maybe they have to lead a mission and overcome their insecurities. This could involve them using the techniques and wisdom that Black Canary has taught them.
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.
She can be depicted as a source of wisdom in the fanfictions. Given her experience in the superhero world, she imparts valuable knowledge to the young Justice team. Her character also adds an element of femininity and grace to the stories. Sometimes, her backstory might be explored more deeply, like her time training and how she became the Black Canary we know, which enriches the overall narrative of the fanfiction.
The 'Black Canary' is often a symbol of justice and vigilance. In the context of such fanfiction, she might be depicted as a force for justice within the unique world or story created. Her skills, like her martial arts and sonic scream, could be used to fight against injustice in the narrative of the fanfic.
Hal Jordan's sidekick could be a young pilot in training. Since Hal is also a pilot, this sidekick would share that passion. They could be someone who idolizes Hal and is constantly trying to prove themselves. In a fanfiction, they could face challenges related to living up to Hal's reputation while also carving out their own identity as a hero.
There are fanfictions that focus on a time - travel plot. For instance, Artemis goes back in time and meets a younger Black Canary. They end up teaming up to change an event in the past that has consequences for the present. This type of fanfiction plays with the idea of their different generations and how their skills could be combined in a unique situation.
The theme of female empowerment is quite common. With both being strong female characters in Young Justice, fanfictions often show them breaking barriers and proving themselves in a male - dominated superhero world. There are also themes related to trust and loyalty. For example, a situation where one of them is in trouble and the other has to decide how far they are willing to go to save their friend.
Some fanfictions focus on Black Canary's role in the Justice League's politics and how that affects the Young Justice team. For instance, if there are debates about the young heroes' level of involvement in League - level missions, Black Canary's stance on the matter can drive the story. There are also storylines where she teams up with other female superheroes from the Young Justice universe to take on a powerful enemy.
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.