Literary criticism terms I use on this blog despite making them up myself, much to the chagrin of anyone who does not have my back catalog memorized:
are we the baddies: SFF subgenre focused on agents of an imperial power realizing that and grappling with what to do next, in contrast to stories focusing on the scrappy rebels resisting said imperial power
I could fix him (the empire): SFF subgenre where the colonized subject being nice and/or sexy enough Ends Colonialism, frequently tied to the John President of Racism problem
librarian bait: books centered on the transformative life-changing power of books and libraries, cousin to books focused on the transformative life-changing power of storytelling and narrative in general
college brochure fiction: stories where the protagonist has an artfully arranged group of diverse friends who are as flat as paper and whose cultural backgrounds never come up meaningfully
the Dave Strider: character the fandom fixates on to the detriment of everything else, until the weight of that attention warps fanon and sometimes even canon around them. almost always male. it's happening to Gurathin from Murderbot right now