You might have seen a prototype of this design earlier; the final, color version will come this month, along with a really new and unusual set of other monsters called THE BOO MEN, which is a kind of forgotten real-world colloquialism once interchangeable with "bogeymen."
I actually had the concept of the Boo Men many years before Mortasheen; an elite sect of mercenary/assassin monsters each patterned after a different human archetype, with their own thematic method of killing.
So, Stingg is a street punk Bogeyman, and her method of attack are the toxins and drugs she can inject through her spines and needles.
Other Boo Men are set to include a gunman, a biker, a scientist and more, and unlike other monsters, each is a unique character retaining the same identical personality and memories no matter how many times they're replicated and employed by a monster trainer.