This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Shirouneri (Japanese)
Shiro uneri flies through the air, chasing cleaning staff and servants. It attacks them by wrapping its slimy, mildewy body around their necks and heads, causing them to pass out from the stench. Though they seem more interested in mischief than murder, shiro uneri have occasionally killed servants by strangulation.
Shiro-Uneri starts out as little dust cloth, in this form it appears like a normal dust cloth, but with a tiny pair of eyes and little stubby arms. It can assume its dragon form upon being used past its prime, and returns to its dust cloth form upon being washed. Its dragon form is covered in white fur.