I have never seen anyone post about these guys on here. They are certainly a cool part of Dungeons & Dragons history and their production was tied in with the TSR bendy figure line.
Here are some prototypes from my collection. I will try to get some more pics and old LJN catalog scans up later...

unreleased version of Kelek - he had a much fatter body to fit the battlematic mechanism
unreleased Valkeer figure
alternate pre-production sculpt of Zarak - most of the differences are subtle except that here his dagger is molded as part of the arm