Upper Torso and tail - Red Grave Digger demon.
Legs and Bone Armor - Skeleton accessory from the Mcfarlane Medusa.
Wings - Bat accessory from Castlevania Dracula.
Skull Belt - McFarlane Predator necklace.
Beard - McFarlane Predator dread lock.
Various spike cut from various figures.

The Imp is the weakest of physical demonic manifestations. Small creatures, 2 feet at max, but usually much smaller. They materialize into the world naked, but quickly dress themselves in rags and the bones of their kills. The more heavily bone armored, the more experienced.