An Imp

1. (chiefly fiction and mythology) A small, mischievous sprite or a malevolent supernatural creature, somewhat comparable to a demon but smaller and less powerful, formerly regarded as the child of the devil or a demon (see sense 3.2). [from 16th c.] Imp - Wikipedia
2. (by extension)
   1. (often humorous) A mischievous child. [from 17th c.] Synonyms: brat, little dickens, scamp, urchin
   2. A baby Tasmanian devil.
3. (obsolete)
   1. A young shoot of a plant, a tree, etc.; a sapling; also, a part of a plant used for grafting; a graft. [9th–18th c.]
   2. An offspring or scion, especially of a noble family; (generally) a (usually male) child; a (young) man. [15th–19th c.]
   3. (Britain, dialectal) Something added to or united with another to lengthen it out or repair it (such as an eke or small stand on which a beehive is placed, or a length of twisted hair in a fishing line).