This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Imp (Medieval)
Imps are often described as troublesome and mischievous more than seriously threatening or dangerous, and as lesser beings rather than more important supernatural beings. Imps are often shown as small in stature and not very attractive. Their behaviour is described as being wild and uncontrollable, much the same as fairies', and in some cultures they are considered the same beings, both sharing the same sense of free spirit and enjoyment of all things fun.
Imps are often depicted as small creatures, typically with horns, sharp teeth, claws, a tail and sometimes with wings. Imps have also been described as being “bound” or contained in some sort of object, such as a sword or crystal ball. In other cases imps were simply kept in a certain object and summoned only when their masters had need of them.