Man, demon kitties are a whole vibe. Their powers usually twist regular cat traits into something supernatural. You get the classic shadow-walking, where they can slip through the smallest cracks and appear out of nowhere, which is basically our cat hiding under the couch but dialed up to a stealth mission. A lot have this psychic link with their chosen human, not just reading emotions but projecting images or memories—super handy for a detective plotline. Their 'cuteness as a weapon' thing isn't a joke either; it's often a literal charm ability that disarms villains or makes guards lower their weapons. I've seen a few that can store objects or even small spells in their fur, like a living inventory pouch.
Honestly, the most unique one I've read was in a webnovel where the kitty's purrs could stabilize chaotic magic. The lead mage was constantly on the verge of blowing things up, and the cat would just curl up and start purring to calm the magical feedback. It was such a specific, non-combat power that totally defined the story's magic system. They're rarely just brutes; their abilities are clever, supportive, or manipulative, which fits that trickster archetype so well.