Homebody seems to be a tall humanoid, possibly up to 2.5 meters tall, with one arm somehow appearing under the stairs, and a long neck. Therefore, it is implied that this is a creature that has similar flexibility to cartoon cat. Therefore we can assume the legs do not stretch like the hands. Similarly, like cartoon cat. The thing is, about the picture, is that the creation seems to be around 5 meters away, so in order to reach that, it must have gone through a vent.
it is possibly up to 2.5 meters in height.