Well, a big trope is the 'mentor - mentee' relationship. The SI OC could be mentored by an established hero in the Young Justice world, like Batman or Martian Manhunter. This helps the SI OC grow and develop their skills. The 'team outsider' trope is also seen a lot. The SI OC may start as an outsider to the main team but gradually earns their place. And there's the 'secret identity' trope. The SI OC has to keep their true identity a secret, which adds a layer of mystery and drama.
In Young Justice fanfics with SI OCs, the 'redemption arc' trope can be found. Maybe the SI OC has a past mistake or a connection to a villain, and they go through a journey to redeem themselves. The 'found family' trope is quite prevalent too. The SI OC forms deep bonds with the members of the Young Justice team, becoming like a family. Additionally, the 'power struggle' trope occurs when the SI OC has to deal with their powers being too much to handle or conflicting with others' powers.
One popular trope is the struggle for identity. Since clones often have to figure out who they are apart from their original. Another is the discovery of unique powers. For example, an OC clone might develop a power that the original doesn't have. And there's also the trope of finding acceptance within the Young Justice team. They start as outsiders but gradually earn the trust and friendship of the other members.
The 'unlikely allies' trope is often used. The Red Arrow may initially be skeptical of the OC, but as they are forced to work together on a mission, they start to see each other's value. There's also the 'shared trauma' trope. If both the Red Arrow and the OC have had difficult pasts, it can bring them closer as they understand and comfort each other. And the 'love triangle' trope can add some drama. Maybe there's another character who has feelings for either Red Arrow or the OC, causing jealousy and tension in their relationship.
One common trope is the 'new recruit' story. The OC Lantern is a fresh face in the Lantern corps and has to prove themselves to the more experienced members. Another is the 'power struggle' trope, where the OC has difficulty controlling their Lantern powers at first. For example, they might accidentally create constructs when they're angry or scared. The 'romantic subplot' is also popular, like the OC falling in love with a member of the Young Justice team. And there's often the 'redemption' trope, where the OC has a past mistake or a dark side that they have to overcome throughout the story.
Writing a great SI OC Young Justice fanfic requires a lot of planning. You need to think about how your SI OC will fit into the existing Young Justice storylines. Will they be a new member of the team? Or an antagonist at first? Build their relationships with the other characters carefully. Their dialogue should be in - character for both your SI OC and the Young Justice characters they interact with. Use vivid descriptions to bring the action and the world to life. And most importantly, have fun with it. Let your creativity flow and don't be afraid to take risks in your story.
One popular trope is the 'enemies to lovers' trope. For example, a hero and a villain or two characters from rival teams might start off hating each other but gradually fall in love. Another common one is the 'soulmate' trope, where the characters are fated to be together in some way, like having a psychic connection or a shared destiny.
One common trope is the 'redemption arc' for the supervillain. Even though they start as a bad guy, they might change their ways in the end. Another is the 'secret identity' trope, where the supervillain has a normal life or appearance that no one suspects. And the 'love - interest' trope is also popular, like the supervillain falling in love with someone unexpected, which could be the SI or another character in the story.
The 'faction building' trope is quite prevalent. In the apocalyptic setting, the young heroes may form or join different factions, either for protection or to achieve a certain goal. This can lead to internal conflicts within the group as well as external battles against other factions. There's also the trope of 'character redemption' where a previously villainous character may find a chance to turn good in the face of the apocalypse.
In Raven Young Justice fanfiction, a common trope is the 'Isolated Raven'. Writers often show her as feeling alone even within the team, which gives room for character growth as she overcomes this isolation. The 'Raven as a Mentor' trope is also seen, where she uses her knowledge and powers to help other, younger characters. And then there's the 'Raven's Prophecy' trope, where her future or a great destiny she has to fulfill is a central plot point.
One popular trope is the 'partners in crime - fighting' trope. Robin and Ceril team up to take on bad guys and their relationship grows stronger through their shared experiences in battle. Another is the 'slow - burn romance' where their feelings for each other develop gradually over time as they get to know each other better.
One popular trope is the 'fish out of water' as Jaime tries to balance his normal life with his new role as a superhero in the Young Justice universe. Another is the 'power struggle' trope, dealing with his powers as the Blue Beetle. And of course, there's the 'slow burn romance' trope often paired with his character, whether it's with an existing character from the show or an original character created by the fanfic writer.