Woobat is a blue, spherical Pokémon, resembling a Honduran White Bat. It is covered in shaggy fur and has a large, piggish nose with a heart-shaped nostril. Two tufts of shaggy fur hide its eyes, and its mouth has a single fang in the center of its upper jaw. There are two relatively small, black wings on either side of its body.
Woobat's nose serves various purposes: It uses ultrasonic waves from its nostrils for echolocation, and it can also be used to grip walls as Woobat sleeps, which leaves heart-shaped marks on the walls of caves.
Woobat may be a combination of woo and bat. It may also involve wool from its woolly appearance.
Koromori may be a combination of kokoro (heart) or korokoro (onomatopoeia for round thing rolling) and kōmori (bat).