It seems that Pure Evil Miniatures are planning on releasing up to 20 miniatures on Kickstarter later this year. My wallet curses you Kickstarter!!
Initially only 7 were planned - Shape Changer, Lizard King and Panther, Bloodbeast (letf), Creature of Havoc, Zanbar Bone, Brain Flayer and Zagor the Warlock - but it seems that range may now be expanding.
With the vagaries of Kickstarter it will likely be up to the whim of backers as to what gets "unlocked"!
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Side note: If you're not familiar with Fighting Fantasy it was a Choose Your Own Adventure-style book series by the co-creators of Games Workshop which rode on the Dungeons & Dragons wave of the early 80s.