What cat breed is Nyan Cat?

Excuse me, but I couldn't help but notice the mention of "Nyan Cat" in the context of this discussion. Now, I'm not a cat expert by any means, but I'm genuinely curious - what breed of feline is this Nyan Cat supposed to be? Is it a Siamese with its distinct markings and slender build? Or perhaps a British Shorthair, known for its rounded face and fluffy coat? Or could it be a completely fictional breed, created purely for the sake of the meme? I'd love to know your thoughts on this intriguing question.