- "Oh sure, my cat's a person now, why not?"
There are two versions of the comic, but the premise is the same. When Keith arrives at his home, he finds that his cat has turned into a cat girl and now has to deal with all the problems and responsibilities that come with it. She's always so hungry, hyper and curious all the time.
Cat Nine provides examples of the following tropes:
- Cat Girl: Myan should be fully human but her transformation is incomplete because Hibi was interrupted while casting her spell. She could easily ask Hibi to fix it but Myan decided that she wants it that way.
- Character Blog: Myan keeps a blog on Tumblr. It's all about cats, food and her dad, as well as mocking dogs. At least she manages to be less obnoxious than otherkin and readers get to ask her questions.
- Head Pet: Myan enjoys riding on Keith's head, much to his annoyance.
- Just Woke Up That Way: Things get interesting when Keith gets home and sees his cat transformed into a cat girl. She's not even aware of her body until pointed out.
- Morphic Resonance: Whenever Myan transforms, she gets to keep her magic collar, her facial markings and her eye and hair color.
- My Instincts Are Showing: Myan still acts like a cat whatever form she takes. It's doesn't matter much if she transforms into something similar(like tigers) or if she transforms to a human, but she's having trouble with her owl form.
- Shapeshifter Baggage: Myan can transform into smaller or bigger animals (or a cat girl) without any problem because of her magic collar.
- Shapeshifter Default Form: Myan's real form is a cat. Since her collar's the one who allows her to transform, she'll revert back to a cat if it gets taken off.
- When Myan practices using her magic collar, she briefly transforms into a pony straight out of Equestria.
- At the petting zoo, Tammy acts like a Disney Princess and talks to the animals, even picking up a goat like how Rafiki lifted the baby Simba and singing "Let It Goat". The Alt Text is also a summary of Undertale's plot."What's that little goat? You have a kingdom under a mountain that's been trapped behind a magical barrier that only I can break? And it's full of interesting characters like a bunch of skeletons, an angry talking fish, and a smart, but shy lizard? And you want me to... KILL THEM ALL?"
- Transformation Trinket: Myan's collar allows her to transform into a cat girl or various animals. Removing it turns her back to normal and removes other powers (like human speech) in the process.
- Translator Microbes: The magic collar given to her allows Myan to talk like a human.