police officer

leads met briefly as children, or leads have never met before

never met before (i hate it when they have some sort of connection in the past)

main character is blind or deaf

main character is deaf

fantasy: main character has magical ability, or main character has an item with magical power

Main character has magical ability

Childhood friends to lovers or ex-lovers to lovers

ex-lovers to lovers

reconcile with former spouse, or former spouse is the villain

reconcile with former spouse

main character can shapeshift into an animal or mythical creature

shapeshift into mystical creature, just because it seems less common

Main male character in his late 30's (romance drama) - never married, or previously married

never married

reincarnation or childhood connection 

reincarnation


slow burn or love at first sight

slow burn

main character has siblings or is an only child

siblings

(modern day) ML's parents have high specifications for his future wife, or they are okay with anyone who seems nice

ML's parents are okay with anyone who seems nice


Married ML's  are living with parents  or staying alone

"with parents" often makes for a more interesting situation - I've watched a number of family dramas where this happens.

(romantic comedy) ML has a cold personality, and he unexpectedly does something very kind. OR ML is always kind with a warm personality.

Both 

ML has a cold personality, and he unexpectedly does something very kind


Small town setting with tight-knit community or big city with diverse characters?

small town setting with tight-knit community

clumsy naive ML or smart jack-of-all-trades ML