So if you were able to to say “freeze” a blackhole at a moment in space time, and remove literally EVERYTHING else around it, there would be nothing to (visually) observe.

As far as a shape, it doesn’t really have one, more so the effect it has on the space around it sort of would make a “spherical hole” so you could describe it as a sphere, but it would be a featureless void of of infinitely dense matter that just warps the way regular space and objects interact with the space around it.

I love how weird they are and the way it makes you warp your brain to think about it.