Fairies in this world aren't like your typical "tiny humans with wings" variety. They are still mostly humanoid in appearance, but skew more toward a specific insect (from a variety of them, like butterflies, bees, moths etc. ) than what most depictions show; and average about 6 inches tall.
Their human-like heads have hair, compound lenses in their eyes, antennae with mystical or psychic sensory, and pointed ears. Their bodies are exoskeletal from the forearms to the hands, from the shins to the feet and from the bust to the crotch in a sort of one-piece bikini-like look. They also possess four arms and a tail that's like an abdomen.
They are entirely female, capable of mating amongst themselves; live under a queen in colonies of their specific insect type (even if said insect usually doesn't have colonies or queens;) and can even disguise themselves as the regular insect they represent... and that's how our main character, Aria, is going to encounter, and eventually become, one of them.