Was the thing where Cronus says he's "human on the inside" Canon or weirdly popular Canon? I'm not sure how to word it, but I see it a lot.

He does talk about being Humankin- Look at his shirt, it’s white with his symbol just like Humans wear them. However, whereas Horuss definitely believes himself to be Horsekin, Cronus also states him doing it as a sort of attention-grabbing statement, and it’s only because Kankri can’t tell apart an actual good, worthwhile cause from his own bias that he tries to push Cronus more into being Humankin and explore that identity, even though it’s pretty obvious he’s just being… Well. Cronus.