One great 'Young Justice Joker Fanfiction' is 'Joker's Gambit'. It shows an interesting take on how the Joker might interact with the Young Justice team. The story is full of suspense and the characterizations are really well - done.
One interesting young joker fanfiction could be about his early days before fully becoming the Joker. It might explore his life as a struggling comedian, showing how his dreams were slowly crushed, leading him on the path to madness.
The popularity of 'Young Justice Joker Fanfiction' lies in the contrast. The Joker is a chaotic and evil character, while the Young Justice team represents hope and heroism. This contrast creates a lot of interesting story possibilities.
Perhaps in the fanfiction, the Joker has created a mind - control device and is using it on some of the Young Justice members. Supergirl and Ace must figure out how to stop him and free their friends. Supergirl could use her strength and flight abilities while Ace uses his wits and any special skills he has.
One idea could be a story where Ace teams up with Supergirl against the Joker's evil schemes in the Young Justice universe. Maybe Ace has some special abilities that complement Supergirl's powers.
First, you need to understand the character. Research his origin, his motives, and what makes him tick. For example, his past as a failed comedian is crucial.
One idea could be exploring the clone's struggle with identity. Is it doomed to be evil like the Joker or can it break free? Maybe it starts to have glimmers of goodness when it interacts with the Young Justice team.
By having the clone interact with the Young Justice team, who have a strong sense of right and wrong. Their influence could make the clone reevaluate its own actions. For example, if it sees how they protect the innocent, it might start to wonder if its actions are justifiable.
A more complex plot could involve Ace having a hidden connection to the Joker that is slowly revealed. For example, Ace could be an experiment of the Joker's from the past that has now joined Young Justice, and the story could explore how this connection affects both Ace and the team.
You can try fanfiction platforms like Archive of Our Own (AO3). It has a large collection of Young Justice fanfictions that might feature Ace and Joker. Just use the search function and type in relevant keywords.