Found this interesting insect hiding behind the thin branch of flower (the diameter of the branch is 3-4mm) in my garden in Kuching, Sarawak, Malaysia
@Karl Kjer It's most likely a Leptocentrus taurus, even though the perspective in the photo doesn't allow to observe the prominent dorsal thorn.
Ants are always trying to come in contact with these mimic treehoppers for collecting the sweet juices secreted by them. Maybe the OP can confirm that.
That is a treehopper. Order Hemptera, family Membracidae. I looked on a site for membracids of Malaysia, and could not bring it to species-level. But I am confident that it is a membracid. This family is characterized by sometimes bizarre protrusions of the pronotum. https://en.wikipedia.org/wiki/Treehopper