Yes, Niko is stylised as a cat (with whiskers notably detached from the nose and instead dubiously attached to the side of the head), but [insert pronoun here] is not roleplaying as a cat, and a furry would love being compared to a cat, unlike Niko seems to be (there's more nuance to this).

Unless I completely misunderstood what you meant by "a furry" and you were just asking if Niko is a cat :)