Encountered earlier today in South Carolina. For scale, those stringy things that resemble magnified arm hairs are magnified arm hairs.
My first thought is katydid.
But I dont see the wings. Maybe a nymph? I’unno.
It’s a leafhopper nymph.
My guess is some kind of a leafhopper nymph.
edit…hmmm, maybe I was right! 
Sorry, I should have said treehopper (Family Membracidae)
I think it’s a treehopper because of the hump on the thorax.
Yep, that looks about (generally) right. In my searches, I hadn’t come up with anything with a “tail” like that.
Just found another of these in the same spot (they must be falling off my hicory tree) and got a pretty good* photo. Measuring by pixels from the 2x4 that it is on (upside down–I flipped the image) it is around 8 to 9 mm long.
*“good” for something this small and taken with a phone that cost me 100 bucks.
Here’s the treehoppers of North Carolina, although very few of the photos are of nymphs. I think you’ll need a specialist to get a species ID.
“Treehopper nymph” is close enough for me–I was just sharing the new photo.
My first thought was aphid, are all these closely related?