In my mind, I picture it being as something that is like 70-80% one thing and maybe 10-20% some other thing.
The dominant trait is much more present, but the lesser trait is there enough to add a little extra 'sauce' to the setting.
I've got a personal project which is kind of a retelling of The Little Mermaid, set in a world based on the Bronze age mediterranean. In this setting there's a human kingdom based on ancient Phoenicia and Minoa, and a merfolk kingdom beneath the Ocean.
The human kingdom is wealthy and...
I have a couple sitting on the backburner that amuse me to no end, but I've decided to slap myself on the wrist and wait until I finish my current projects first. Plus both of them need some time in the oven.
It's not that the story ideas aren't fun, but they're a bit too goofy in their current...