Personality
Sly | Deceptive | Persuasive | Flirtatious | Dangerous
Insidious was not this she-cats first name, no, she used to be known by the name of Indigo, but something.. Something caused this she-cat to changed, at least mentally, not physically. Indigo used to be a sweet, loving she-cat who helped any cat she came across as she wandered about the countryside, she'd likely give the pelt off of her back if she had to for a complete stranger without a second thought.
But that is not this she-cat anymore. Now she is known by the name of Insidious; she is a very sly, very deceptive cat who will toy with you for moons, leading you on until she brings you to your demise without a question, using her beautiful looks as bait to lure both tomcats and she-cats in. If she deems you worthy of her time, she will come off as flirtatious and almost helpless, desiring affection and company, but this is simply a tactic that she uses in order to soften you up and for you to let your guard down.  Knowing that this may take a while depending on the cat, Insidious has learned to be quite patient and is willing to let moons upon moons go by as she whittles down your guard until finally you're treating her like a close friend. At this point, she is ready to strike. And by strike, she will very likely try and kill you, using the element of surprise to her advantage as she lunges for your throat.
It's not clear why Insidious has suddenly become a murderous cat, perhaps it was something that she had discovered happened to her family, it may very likely be because she discovered her mother was murdered and so she wants to get back at any cat that she can by turning to these murderous ways.
Nonetheless, she is a dangerous cat and it is best to avoid her at all costs.