Imps would not spawn naturally in the overworld until you open the nether portal for the first time. This releases all the evil critters from the nether. (Pandora's Box much?) Imps can disguise themselves as friendly, and neutral mods. The only way to tell the fake from the genuine article is by its behavers. The Imps steal your stuff if they get close. They transform into true form when hit and agro. The drop should be something good.
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