This is found every now and then. In one picture is its nymph also. Which is this please?
CLOSED: Is this a leaf hopper - has horn like...
It's a treehopper (family Membracidae). Some species have their prothoracic 'horn' expanded into truly bizarre forms.
From your clue, I found this and this looks closest as in the link in it 'India Nature Watch'. https://www.whatsthatbug.com/2012/12/24/treehopper-from-indonesia/ Thanks Ed.