One idea could be to create an OC who is a former victim of the Joker's madness and now has powers as a result. They could join the Young Justice team to seek revenge against the Joker. Another idea is an OC who is related to an existing character in the Young Justice universe and is lured into the Joker's chaotic world. For example, a relative of Robin who the Joker tries to corrupt.
Well, you could have an OC that is a genius inventor who gets caught in the Joker's crosshairs. The Joker wants to use their inventions for his evil schemes, but the OC manages to escape and teams up with Young Justice. They use their tech skills to outwit the Joker at every turn. Also, an OC with the power to manipulate emotions could be interesting. They try to understand the Joker's psyche through his emotions and end up being a key figure in a plan to stop him.
Chapter 259 is the strongest chapter-level answer because it starts from While the villagers of Chixia Village were all immersed in the revelry of... and follows through on It wasn't that he was scared..
If you want the clearest chapter reference, go to Chapter 225. Early on, When Zhao Lang's devastatingly handsome face appeared, all six people...; later, the chapter leans on Damn, boss is so handsome, so powerful!" "Boss, I love you, when are you....
The best chapter pointer here is Chapter 220, "The program team actually invited such a high-level boss!". It opens with I know everyone has many questions, and I'm here to answer them one by... and closes on However, Su Yinwan and Shang Shaojing weren't particularly attentive to....
The best chapter pointer here is Chapter 208, "Those Who Commit Many Wrongs Will Destroy Themselves". It opens with Jiang Yan clicked his tongue, "What's this about money? and closes on Seemingly sensing the raging fire in Su Yinwan's heart and feeling....
Chapter 256 is the strongest chapter-level answer because it starts from Turning around, Jiang Yan and Zhao Lang found their heads had been... and follows through on I was dazzled seeing Jiang Li trending today." Next door, Su Yinwan let....
If you want the clearest chapter reference, go to Chapter 208. Early on, Jiang Yan clicked his tongue, "What's this about money?; later, the chapter leans on Do I look like I'm short on cash?" "Then why are you holding out your....
A practical answer is Chapter 226, because it turns the idea into a concrete scene. The chapter opens with What was all that before then?, adds pressure through The moment Jiang Li saw it, she confirmed her guess even more., and ends on Are you sure you can be on the list of winners?] Zhou Xu: [?.
If you want the clearest chapter reference, go to Chapter 231. Early on, Huo Xuan felt a burst of secret delight in her heart.; later, the chapter leans on Huo getting angrier, she became even more adept at playing the innocent....
Look to Chapter 265 for the clearest answer. It begins with As expected, the truth behind the video was unearthed one by one and..., keeps building through Meanwhile, Jiang Li and Zhao Lang's actions against the poachers garnered..., and lands on Miss Su, I also don't know why things turned out.
If you want the clearest chapter reference, go to Chapter 212. Early on, Although she appeared outwardly flattered, in fact, her heart was already...; later, the chapter leans on Since Shang Shaojing wanted to use his good score to help her restore the....