I really like 'Si oc avengers fanfiction' where the OC has a unique power. For example, there's one where the OC can control time in a very different way than Doctor Strange. It adds a whole new layer of complexity to the Avengers' adventures.
Secondly, make sure your story fits within the Avengers' universe. Understand the existing characters' personalities and relationships. Don't make Captain America act completely out of character. Also, include lots of action and adventure scenes that are typical of the Avengers.
One popular trope is the 'fish - out - of - water' story. Your OC, coming from a normal life, suddenly finds themselves in the middle of the superhero world. Another is the 'power - up' trope, where your OC discovers new powers or abilities during the course of the story. And the 'team - up' trope is also common, where your OC teams up with Spiderman and the Avengers to fight a common enemy.
When writing this kind of fanfiction, start by researching the existing Spiderman and Avengers universes thoroughly. Know the powers, personalities, and story arcs of the main characters. For your OC, decide on their powers carefully. If they have super strength, think about how it compares to the Hulk's. Then, plot out a story that has a clear beginning, middle, and end. In the beginning, introduce your OC and their situation. In the middle, build up the conflict, whether it's against a new villain or an internal struggle within the group. At the end, resolve the conflict in a satisfying way.
If the SI has the power of telepathy, it can greatly affect the Avengers' dynamics. They could read the minds of the Avengers, which might lead to some initial mistrust. However, if used properly, it could also enhance communication during battles. For example, they could quickly convey the enemy's plans to the rest of the team. Another example is if the SI has the power of flight and super speed. This could change the way the Avengers approach battles, as the SI could be used for quick reconnaissance or to quickly transport team members to different locations. It could also make some members a bit jealous at first, but over time, they would learn to utilize this new asset.
To create a memorable male SI OC in Naruto fanfiction, first give him a distinct appearance. Maybe he has a unique hair color or style that stands out in the Naruto world. For example, bright blue spiky hair. Second, give him a special ability that is different from the existing ninja abilities. Such as the power to control time on a small scale. Third, give him a strong motivation or goal. For instance, he wants to change the fate of certain characters in Naruto who met a tragic end in the original story.
To create a believable SI OC in a Percy Jackson fanfiction, start with giving them a clear backstory. For example, if they're a demigod, explain how they discovered their powers and how they got to Camp Half - Blood. Also, give them flaws. Maybe they're too impulsive or overly shy. This makes them more relatable.
First, give him a clear backstory. For example, if he has superpowers, explain how he got them. Was it an accident, genetic, or something else? Second, give him flaws. He can't be perfect. Maybe he's too impulsive or has a fear of heights which can create interesting situations in battles. Third, give him relationships. He could have a family member he's trying to protect or an old friend who has turned bad.
Another good one is 'My Life as a Zoldyck OC'. It stands out because it delves deep into the Zoldyck family secrets from the perspective of the OC. The story is full of twists and turns, like when the OC discovers a hidden part of the Zoldyck mansion that no one else knew about.
One popular SI OC Harry Potter fanfiction is 'The Changeling'. It has an interesting take on a self - inserted original character in the wizarding world. The story follows the OC as they navigate Hogwarts and deal with the challenges and mysteries there.