whim·sy
ˈ(h)wimzē/

noun

playfully quaint or fanciful behavior or humor.

“the film is an awkward blend of whimsy and moralizing”

a whim.

plural noun: whimsies; plural noun: whimseys

a thing that is fanciful or odd.

“the stone carvings and whimsies”

 
~OR