I've had insects show up twice. To introduce them they were hired by a semi-retired runner who mostly keeps an eye out for bugs these days, who'd located a small beetle hive. He taught the shaman insecticide and made sure they went in geared up to the hilt. It was a bit of a nightmare of never knowing when beetles would burrow in behind the team, drop them into a cross tunnel, etc. But with veteran guidance they got through it.
On a later run there was a place where a bug nest had been burned out by Firewatch, but one of the solo wasp spirits that preys on other insects had been preying on that nest and working on seducing a local young weakly talented magic type. To him, she was his amazing flying magical dream girl, who he was desperate to please and protect. Team was sent there by someone who had sensed traces of the insect's magic. Digging around they found traces of his and her magic eventually, had to figure out how to find her based on him, then deal with the pair of them. It was far more about the emotions of dealing with a young love-struck nerd than great danger from the spirit.