A minor Touhou character appeared in Forbidden Scrollery.
It is a giant snake that ate a human and became a youkai in the Outside World. After being transported into Gensokyo, it started eating in taverns and pubs without paying for the food. Can disguise itself in various ways.
See also:
Touhou Wiki: http://en.touhouwiki.net/wiki/Minor_Characters#Unnamed_Snake_youkai