Well, the reader might experience a whole new world of adventure. The Sanses from different AUs could have unique personalities and abilities. For example, an Underfell Sans might be more aggressive compared to a classic Sans. And the Gasters could bring in some mystery and scientific elements. The reader could get involved in their stories, help them solve problems or just be a witness to their daily 'lives' in the fanfiction world.
Maybe the FNAF animatronics end up at Monster High for some reason. The students at Monster High are used to being different and spooky, but these animatronics are a whole new level of creepy. The Monster High ghouls and dudes could try to befriend them, but the animatronics have their own dark motives related to their haunted past in the pizzeria. Clawdeen Wolf might see them as a threat to the school's harmony.
Well, perhaps the titans could be like the animatronics in FNAF. The Survey Corps could be trapped in a titan - infested area that has some strange FNAF - like mechanics. For example, the titans are only active at night and there are 'rules' to avoid them similar to the rules in FNAF games.
Adaptation is also a big theme. The fem reader has to adapt to the different and sometimes strange situations in the AUs. For example, in some AUs, the laws of physics might be different or the social norms are very distinct. And then there's the theme of self - discovery. Through her interactions with the sanses, the fem reader often learns more about herself, her strengths, and her weaknesses.
Well, in a My Hero Academia meets FNAF fanfiction, a really cool concept could be the quirks interacting with the FNAF lore. Like Todoroki's ice and fire quirk could be used to either freeze or burn the animatronics. And the animatronics' strange behavior could be seen as a new type of 'quirk' in the My Hero Academia universe, leading to some really unique battle scenarios.
One popular 'human fem reader meets all au sanses' fanfiction is 'Multiverse Encounters'. It has an interesting plot where the female human reader is transported across different AUs and has various interactions with the sanses. The character development is quite good.
An AU fanfic is a type of fan fiction where the story takes place in an alternate universe with different settings or circumstances than the original work.
An au fanfic is a type of fan-written story that takes the characters or setting of an existing work and places them in an alternate universe or situation that differs from the original.
One way is to have an open and honest conversation with the host family during the interview process. Au pairs can ask about the family's expectations and also share their own. And during the stay, if something is wrong, don't be afraid to speak up or seek help from the au pair agency. Au pairs should also trust their instincts. If something seems off during the initial contact with the family, it might be a sign to look for another opportunity.