Impidimp seems to be based on a variety of malevolent fairy-like creatures from European folklore, specifically imps, goblins, and gremlins. Its habit of sneaking into homes and causing mischief could be a reference to the boggart.
A boggart is a creature in English folklore, either a household spirit or a malevolent genius loci (that is, a geographically-defined spirit) inhabiting fields, marshes, or other topographical features. Other names of this group include bug, bugbear, bogey, bogun, bogeyman, bogle, etc., presumably all derived from (or related to) Old English pūc...
