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.
Stray Kids, on the other hand, would also be very concerned. Bang Chan, as the leader, would take charge. He might start asking questions to figure out what exactly happened. Felix could be bringing water or something to make Y/N feel better. Lee Know would be standing guard, making sure no further harm comes to Y/N while they are in a vulnerable state.
Y/N should have their own goals and dreams. If they're interested in becoming an Auror, that can shape their actions and decisions. Their reactions to Draco should be based on their personality. If they're a shy person, they might be more hesitant around him. And make sure their dialogue is natural. Don't make them say things that are out of character just to move the plot along. For instance, if Y/N is a studious type, they're more likely to talk about books or spells when interacting with Draco.
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.
Fanfiction.net is also a platform where you might find Monsta X fanfics. It has been around for a long time and has a vast database. But be aware that the interface might not be as user - friendly as AO3 or Wattpad. You still need to search using 'Monsta X' as the keyword and then filter through the results to find the ones you like.