Unnamed rabbit(s) OR humanoid rabbit youkai(s) who work and live in the Eientei household, so named because Kaguya calls all Eientei rabbits by this name. They make their first clear appearance in Touhou Bougetsushou, in both Silent Sinner in Blue and Inaba of the Moon and Inaba of the Earth. In the former, they are depicted in humanoid form, similar to Tewi. In the latter meanwhile, they are depicted in animal form, bunnies, with simple features such as ears and arms that are drawn round and short, simple slits for the eyes (although a more round one are also acceptable), and a cat-like curled mouth. For example, see post #397780.
For clarity, this tag does not refer to Inaba Tewi.