My theme is Creatures in Paranormal Fiction.
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I is for Imp:
An imp is a tiny creature from folklore and children's stories who plays harmful or mischievous tricks. It is similar to, although considerably smaller than, a goblin.
A darker rendering of this creature, labeling it a "spawn of the devil," can be found here: http://www.mythicalcreaturesguide.com/page/Imps.
I haven't run into any books where imps were the heroes or heroines (if you have, please comment below), but a more common version is in the role of a familiar to a more powerful being, sometimes even to those who wield their magic on the side of good and in noble causes.