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.
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.
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.
If RWBY were to react to Spy x Family fanfiction, they would bring their own perspectives. Ruby, with her innocent and curious nature, would likely be intrigued by Anya's telepathic abilities. Weiss, being more refined, might analyze the political and social aspects of the Spy x Family world. Blake, having experienced secrecy herself, would empathize with the characters hiding their true identities. Yang would enjoy the comical moments and the action - packed sequences, like when Loid does his spy stunts.
You can start by looking on fanfiction websites like Archive of Our Own. Just type in 'Spy x Family React' in the search bar, and it'll show you a bunch of relevant stories. Check the ratings and reviews to see which ones are popular and well - liked.
A fanfiction about Anya's school adventures sounds really cool. Anya's experiences at school are already full of humor and chaos in the original work, so in fanfiction, it could be even more exaggerated. Maybe she'll get into some crazy trouble with her classmates that involves her telepathic powers in a new and hilarious way.
One idea could be that Naruto, with his ninja skills, somehow gets involved in the world of Spy x Family. Maybe he's sent on a mission to assist Loid in a particularly dangerous espionage task. Another could be a crossover where Anya, using her telepathic powers, discovers Naruto's big secret about being a jinchuriki.
If the My Hero Academia characters were to react to Spy x Family fanfiction, it would be quite a spectacle. Momo Yaoyorozu could be impressed by the creative plots in the fanfiction. She might admire how the Spy x Family world is built with its own set of rules and characters. Kirishima would likely be excited by the action scenes. He'd be all about the times when Loid has to fight or use his spy skills. And Mineta? Well, he might have some inappropriate thoughts, but we'll just ignore that and focus on the more positive reactions of the other characters.