akaname; filth-licker yōkai
A yōkai from Japanese folklore said to lick the grime and filth in bathrooms and bathtubs. Often depicted as a small, red-skinned creature with a long tongue. The name literally means 'grime licker'.
The akaname is a yōkai said to lick the dirt in bathrooms.
There is an old tale that says you should keep the bath clean because the akaname will appear.