Favoute fanfiction cliché/trope?

[lucre-noin.livejournal.com]

I am as curious as awlays and I was wondering what kind of fanfiction cliché/trope you prefer to read. I guess a cliché or a trope can be a certain situation that is used in more than a couple of fanfictions and that comes directly from situations from the different universes (comics, movies etc.)

For example, I have a special preference for the classic "Steve doesn't know that Tony is Iron Man" and I adore also the "Steve and Tony goes on dates but Tony doesn't know they are dating".

Comments

[green-grrl.livejournal.com]

I'm a sucker for "have to pretend to be boyfriends" or "have to get married" fics! Also "Tech/Magic cause transformation/bodyswap/de-aging/genderswap," and travel to alternate realities or time travel.

I also love fics that involve JARVIS and/or Tony's robots as characters.