I know nothing about these. We got them second hand in the 90's. They appear to be part of the 70's ceramics hobby.
Here's the Chewbacca one. It has a separate wooden base. with a post for a bulb/lampshade over his head. Inside Chewie are large Xmas light bulbs that shine out of the holes in his bandolier for mood lighting.
These are two Darth's, acquired at two separate times/places.
Both Darth's have Xmas light bulbs for mood lighting similar to Chewie. They don't have any sort of regular lamp function like he does though. They're the same sculpt with individual customizations.
to be innocent fan art in and of themselves, with the molds being an IP breach. Depending on who made them and what they did with them, there could be no IP breaches or both the lamps AND molds could be piracy. Who knows.