question

In the cat arc from Bakemonogatari, Hanekawa has cat ears that match her black hair color while she's in an inbetween from, more cat than normal, not quite "Black Hanekawa" (who is in fact colored white). Note that, if she had received Araragi dick here, she would have been cured of her cat ears and not become Black Hanekawa for the second time, as the cause of this stress was heartache from losing the Araragi-bowl. This brings up an easy alternate timeline that I'm surprised Nisio never went down the path of, as the Araragi crush would've solved her stress in that time, but would've never solved the underlying "accept yourself" issues that came to a head in the Tsubasa Tiger arc.

Just official art and figures that have come out with Hanekawa wearing cat ears, artist took to that, and drew her like that also..

Bakemonogatari ep 13 at 16min 36sec. She is hiding her cat ears with a cap and takes it off to show Araragi. I'm pretty sure there are others too.

i think in a couple imaginary scenes but its not in her design to have cat ears in normal form