One popular 'wmmap fanfic' might be those that explore different character backstories. For example, there could be fanfics that focus on the early life of the main character in a more detailed way than the original work.
Fanfiction.net is also a place to look for 'wmmap fanfic'. There are many writers who post their works there. However, the interface might be a bit different from AO3, but it still has a decent amount of content related to this fandom.
Well, Spy x Family fanfiction can be really interesting. Some fanfictions might explore different relationships between the characters in more depth. For example, they could focus on the bond between Anya and Loid in a new situation that wasn't shown in the original manga or anime. It's also fun to see how authors play with the spy and assassin themes in unique ways.
At first, Harry Potter would likely be taken aback. The X - Men universe is so foreign to his own magical realm. But as he delved into the fanfiction, he could start to enjoy it. He might laugh at some of the more humorous interpretations of the X - Men. He could also feel a sense of kinship with the characters as they face challenges and try to protect their own kind. He may even start to daydream about what it would be like if he had some of the X - Men's powers in addition to his magic, and how he could use them to fight Voldemort.
Raven would likely first try to use her telekinetic and magic powers to break free. If that doesn't work, she'd probably start to analyze Red X's motives. She's a very intelligent character.
Loid is also a top pick. His stoic and secretive personality would make his reactions to unexpected situations or revelations in a react fanfic very engaging. He could be reacting to Anya's school life shenanigans or Yor's attempts at being a more 'normal' wife, and his internal struggle to maintain his cover while dealing with these emotions would be fascinating to explore.
One idea could be the Forgers reacting to an alternate universe where their secret identities are all exposed at once. It would be full of chaos and interesting character interactions.
Merlin is usually very empathetic. He'll listen to the reader's problems without judgment. In some fanfictions, he might share his own secrets and fears to make the reader feel less alone. He'll also do practical things, like bringing the reader food or making sure they have a warm place to stay if they're in a difficult situation. He'll try to show the reader that there are always options and that life is worth living.
One interesting Spy x Family React fanfiction could be where the Forger family reacts to different spy gadgets. It's fun to imagine Anya's excited reactions to cool spy tech. Another might be them reacting to different types of missions that Loid has been on. It gives a new perspective on his character.
Naruto's friends in Konoha would probably be a bit surprised at first. But they would soon come around and support him. His old mentor, like Iruka, would be happy for him. As for Mei's side in Kirigakure, her comrades might be a bit more cautious. But once they see how Naruto can contribute to their village as well, they would accept the relationship.