rascalimp

noun

Plural: rascalimps

A small creature that is a rascal (a rascal + an imp); a tiny mischievous dwarf or sprite.

Examples:

The search for scientific nubs and principia of all the mentioned incomprehensible happenstances was often associated with remarkable imperilments. Ouch, now I felt a virtual sting in my spirit, which Fero the rascalimp would have bestowed on me if he knew I just called him a "happenstance". (Source: J∙ Okram - The Mystery of the Rammed Key.)