Do cicadas bite humans or pets?
No, you will not be bitten by a cicada nor will it seek you out and attack you, says Howard Russell, M.S., a board-certified entomologist at Michigan State University.
In fact, they can’t even bite you (or your pets) if they want to. “Their mouths have no mandibles—or jaws—and they have no physical characteristics like a stinger with which to defend themselves,” says Timothy Best, a board-certified entomologist and technical manager at Terminix. What they do have, though, is a drinking straw-like appendage coming from their mouths that they use to suck up sap—but that won’t hurt you.
https://www.prevention.com/health/a36449653/do-cicadas-bite/
They are harmless, even to plants. Trust me, I have thousands of them.
They actual kill off the ends of tree branches. The lay eggs on the branches and chew the branches so they fall. The eggs are then returned to the ground for the next cycle. Several years back there was a 13 year batch and after the wave was done there were dead tree branches everywhere.