most tropes involving a couple's desire for and attempts to adopt/have kids tbh. bonus points if the kid finally arrives after much drama and heartbreak and consuming most of the couple's screentime only to be more or less forgotten about except when needed as a plot point. a+ way to show how desperately those characters wanted to be parents. idk i'd just like to see more couples in fiction who are happy being childless and for it to not be a big deal that they are. especially if it doesn't make sense setting or story or characterization-wise for them to be so obsessed with making babies.

runner up is will-they-or-won't-they that you know is going to be "they will", except to get to that point you have to sit through dozens of hours of false starts, breakups, other love interests etc. long past the point where the ust has gotten stale. i especially hate this when the writers do it under the guise of "keeping things interesting" (hint: maybe they're not a great pairing after all if you can't figure out how to make them interesting once they're official) and get pissed at the fans for getting frustrated and bailing when they're let down for the thousandth time.