A lullaby sung in a character's childhood becomes a great deal of help and/or comfort for said character as an adult.

A character shouts "Enough!" and either exhibits an intimidatingly god-like array of power or commands the attention of everyone present. Either way, everything pauses and/or changes for a moment.

In a moment of great need and/or when all hope seems lost, a character displays an instance of unfathomable power and saves the day (at least for a moment) then passes out from exertion. Bonus points if said character didn't know they had that kind of strength.

Any variation of "May I kiss you?"

"If (so and so) wasn't happening right now, I'd kiss you" and they kiss anyway.

A character that's deemed untouchable and uninfluenced by any force is suddenly at their antagonist's mercy because said antagonist took the one thing/person they secretly care about.

Character A who was hiding their original gender for one reason or another (maybe is trans and unable to transition), and Chatacter B being supportive anyway after they find out

Characters dancing and when they split up they each up dancing with a respective enemy

Character A and Character B are from vastly different cultures, but they're stuck in a dangerous situation in a third culture neither know anything about

Character A is from a hot climate and Chatacter B is from a cold climate, Character C is just trying to touch the thermostat

Evil and deadly intimidating character who loves one type of pet a little too much

Character A is a member of a very fertile species, and is now lovingly introducing Character B to their family

Character A and Character B who just got done fighting each other and are now going out for ice cream

specific tropes i love: shared dreams

specific tropes i love: ending up on opposing sides, even if the love's still there