You know, what if beast yōkai are naturally more comfortable in their beast form – and only ever take the human form when they need the utility and power? For instance, since the human form is taxing on the energy, Orin takes on the cat form when she's just relaxing.
Though I suppose we must also define what counts as a beast yōkai. Otherwise, imagine visiting Kōmakan expecting to see Remilia and Flandre just enjoying some tea as usual – but instead they're hanging on the room's ceiling not just like bats, but as bats. 🦇🦇