I have found an insect sitting on one of my plants, in Auckland, New Zealand.
It is sitting on a broad bean leaf about 6 cm wide
Is this a friend or foe?
My best guess is a nymph of Caedicia simplex, (common name Katydid, Kiki Pounamu). These are native to Australia and New Zealand. They do feed on plants, but don't usually cause much damage unless the populations are great.
There are many color variants. Here's a comparison pic of a nymph that looks similar to yours: