This is the closest form I can get to for GrumpyCat in KittyCats.
It's not perfect. Frankly we do not have the right ears or whiskers. I show soft curl here but that only works full-frontal. A pointy ear but with a rounder tip than foxie would be the thing. Those whiskers are amazing! I show simple plush here:
GrumpyCatKittyCatsStyle
Fur: Snowshoe Chocolate
Eye: Blue Ice (curious, small) - but I've seen plenty of photos with Big pupil too. Other blues maybe: Mercury?
Shade: Natural
Tail: Lush - not visible in these photos, but you can see it in some YouTube videos etc.
Ear: we don't have this ear; maybe could use mysterious or curious or foxie but they're not quite right.
Whisker: White (??? Plush? Fussy is too neat but has the spread)
There's a cat breeding project for everybody.