Diggersby is a bipedal Pokémon that resembles a large, portly gray rabbit. Its most notable feature is its two ears, which resemble muscular forearms, complete with three-fingered paws. The ears are mostly gray with pink interiors, whereas the paws at the tips are brown. There are three brown spots above each ear-paw. A pointed protrusion in the middle resembles an elbow. These ears are strong enough to lift objects weighing over a ton and prove to be an invaluable asset in Diggersby's digging.
Diggersby's remaining limbs are small in comparison to the ears. The fur of the upper paws is white, while the feet are brown; each paw has three digits. A sash or belt-like band composed of thicker, woolly fur surrounds its waist; it tends to tuck its paws into this fur. This sash is divided into sections: brown on its sides and yellow on the front and back. Its short tail is also yellow and protrudes from the back section of the sash. Diggersby's face has a large brown muzzle with prominent cheeks. The coloration around its muzzle extends down onto its neck and resembles beard stubble. It has two large upper incisors, three whiskers on each cheek, a tiny, pink nose, and eyes that appear to perpetually squint.
Diggersby is based on a rabbit. Considering its ability to use its ears as powerful digging and excavating tools, as well as the fact that it hangs out at construction sites, Diggersby is probably based on an excavator and possibly other heavy equipment. The brown fur on its ears resembles excavated dirt or mud. Its tendency to laze about after working, as well as its muzzle and mud-like markings, may also mean Diggersby is based on construction workers as well.
Diggersby may be a combination of digger and bunny.
Horudo may be a combination of 掘る horu (to dig) or hole and 土 do (soil) or 兎 to (rabbit).