From a kink POV almost all of the mini-giants I see tend to be more M/m. But if you look at media in general I feel like they’re actually relatively common. Size is used a lot to convey if someone is superhuman or godly or something. The two examples I think of right away are Warhammer and Halo.
Also I don’t read a lot of romance novels, but I know its a running joke that the authors will make the female lead as tiny as possible and the male lead as tall as possible. Makes me wonder how that audience would react to more extreme size difference.