In 'Batman Saves His Parents' fanfiction, the 'secret knowledge' trope is often used. Batman discovers something that gives him the means to save his parents, like a hidden technology in the Batcave that can manipulate time. The 'redemption arc' trope can also be applied in a unique way. Maybe a character who was once a villain in the normal Batman story helps Batman save his parents as part of their own path to redemption. And the 'reunion' trope is central, as it focuses on the emotional reunion between Batman and his parents if he is successful in saving them.
Well, the 'found family' trope can be used in a different way in this type of fanfiction. Instead of Batman creating a new family with Alfred and his allies, he gets to keep his original family. There's also the 'hero's journey reversed' trope. Usually, Batman's journey starts with the loss of his parents, but in these fanfictions, that loss is averted, and we see how his character develops in a different direction. And the trope of 'unexpected ally' can be used, like a villain who helps Batman save his parents for some self - serving reason.
Yes, it is possible in fanfiction. Fanfiction writers often explore 'what - if' scenarios. They could imagine a scenario where Batman has some sort of precognitive ability that he didn't know about before. With this ability, he could foresee the attack on his parents and stop it. This would create a whole new narrative for Batman, where his origin story is completely rewritten and his relationships with other characters in the Batman universe would also be different.
One popular plot twist is that Naruto's parents are actually alive but in a hidden dimension. Naruto discovers this accidentally. Maybe he's on a mission and stumbles upon a strange portal. When he enters, he finds his parents who were trapped there by an unknown enemy. He then has to fight this enemy to free his parents and bring them back to the real world.
A common trope is the 'fish - out - of - water' one. Fem Percy Jackson is used to the world of Greek gods and demigods, so when she's in Gotham, she has to adapt quickly. Another popular trope is the 'powerful - duo' trope. She and Batman team up and their combined skills and powers make them an unstoppable force against the villains.
In Young Justice Watch Batman Beyond fanfiction, the 'mentorship' trope is quite popular. Terry could act as a mentor to the younger heroes of Young Justice, teaching them about the more advanced technology and different ways of being a hero in his time. The 'alternate universe' trope is also used a fair bit. Writers create a different version of the DC universe where the events of Young Justice and Batman Beyond are intertwined in unique ways. And then there's the 'culture shock' trope, which is all about how the characters from one era react to the different culture, values, and technology of the other era.
In many fanfics, the 'hurt/comfort' trope is used. Harley might be in a bad situation, and Batman comes to her rescue, which then sparks their love. The 'fish out of water' can also be seen when Harley tries to fit into Batman's world. For example, she may struggle with his no - killing rule and his more serious approach to crime - fighting, but their love overcomes these differences.
Well, it might be that in the fanfiction, there's a parallel universe where Batman's parents didn't die. So he meets them in this alternate reality. He has to adjust to a world where he doesn't need to be the brooding vigilante. Instead, he gets to experience a normal family life, but he also realizes the importance of his role in his own universe and takes some valuable lessons back with him.
Batman himself is obviously very popular. He is the central figure and his brooding, detective - like nature is always interesting to explore in fanfiction.
One popular trope is the 'Underestimated Sakura' where she surprises everyone with her skills and abilities. Another is the 'Sakura's Growth' trope, which focuses on her development as a character, both in terms of her ninja skills and her personal relationships. There's also the 'Sakura as a Healer' trope, emphasizing her role as a medical ninja.
One popular trope is the 'Overpowered from the Start'. In many reincarnated with a system fanfictions, the main character is given a system that immediately makes them much more powerful than others in the new world. For example, they might have a system that gives them stats far beyond normal characters or unique abilities that no one else has. Another common trope is 'Quest-based Progression'. The system assigns quests to the reincarnated character, and as they complete these quests, they gain rewards like new skills, items, or level - ups. This gives a clear path for the character's development. And 'Hidden System Features' is also quite popular. As the story progresses, the main character discovers new and unexpected functions of the system, which adds an element of mystery and excitement to the plot.
One popular trope is the 'Redemption Arc' for Mysterio. In many fanfictions, he is given a chance to redeem himself in Peter's eyes. Another is the 'Mentor - Apprentice' relationship, where Mysterio teaches Peter some new skills or ways of thinking. 'The Enemy - Turned - Ally' trope is also common. They start as foes but circumstances force them to work together.