It could be a young Amazonian who has been chosen by Wonder Woman to be her protege. This character would have the physical and mental strength typical of the Amazons.
There could be a half - human, half - Amazon character. This would create an interesting dynamic as they struggle to find their place in both the human and Amazon worlds. They would have some of the Amazonian powers, but also the emotions and experiences of a human. As a protege of Wonder Woman, they would be in a unique position to bridge the gap between the two worlds and use their dual nature to their advantage in the Young Justice adventures.
In this fanfiction, the plot might revolve around the protege being sent on a special mission by Wonder Woman. This mission could be to protect a certain location or person. Along the way, they encounter other characters from the Young Justice universe. They might struggle with making the right decisions, as they are still learning from Wonder Woman. There could also be a conflict within the protege, whether to follow Wonder Woman's methods strictly or develop their own style of heroism.
Lex Luthor could be a great villain. He's always interested in taking down the Justice League and its affiliates. He might see the clone as a way to disrupt the Young Justice team and gain an advantage over Wonder Woman.
A possible plot could be the sidekick getting kidnapped by one of Wonder Woman's enemies. This enemy could be trying to use the sidekick as bait to lure Wonder Woman into a trap. The sidekick would then have to use their wits and any skills they've learned from Wonder Woman to escape or at least hold their own until Wonder Woman arrives to save them. This would not only test the sidekick's abilities but also strengthen their bond with Wonder Woman.
The concept of a Wonder Woman clone in Young Justice fanfiction can also be used to explore the idea of nature vs. nurture. Is she destined to be like Wonder Woman just because of her genetic makeup? Or will her experiences in the Young Justice world shape her into something completely different? Writers can play with this idea, showing her development as she interacts with the other characters and faces different challenges.
In fanfiction, the Wonder Woman clone could be a symbol of hope or a dark omen depending on how she is written. If she is written to be a force for good, she could inspire the Young Justice team to new heights. But if she is written as a corrupted version, she could represent the potential for evil within the heroes themselves, as they see a distorted reflection of Wonder Woman in her.
In fanfiction, Wonder Woman might be more vulnerable. The original often portrays her as a strong and almost invincible figure. But in fanfiction, writers may show her with insecurities, especially when dealing with the younger and sometimes more impulsive heroes in Young Justice.
Dinah Lance herself can be a popular protagonist in these fanfictions. Since she's Black Canary, she's central to the story. Another could be a newly created protege character, like a young girl with a special power who is taken under Black Canary's wing. Also, characters like Artemis Crock might be protagonists in some fanfictions where she has a connection to Black Canary as a protege - like figure.
In the fanfiction, the sidekick could have unique powers. For example, they might have the ability to communicate with animals, which would be useful in both combat and in gathering information. This power could also lead to some interesting interactions with the other Young Justice members. They could help Aqualad communicate better with sea creatures during a mission, or help Superboy understand the instincts of wild animals. As the story progresses, they grow in their powers and in their confidence, becoming a valuable asset to Wonder Woman and the Young Justice team.
One idea could be a crossover where Naruto is somehow transported to the Young Justice universe and teams up with the heroes there, and then they encounter Wonder Woman. Maybe Naruto's unique jutsu skills can be used in a joint mission with the Young Justice team's powers and Wonder Woman's abilities.
One common theme is mentorship. Wonder Woman often takes on the role of a mentor to the young heroes in Young Justice. Another theme is power and responsibility. Since Wonder Woman is such a powerful figure, the fanfictions often explore how the young heroes learn from her about using their powers wisely.