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How about modular figures?

Separate heads, bodies and legs so that you can 'mix and match' and create lots more variations...

That's what Lawrence did in the beginning, when the figures were still cast from tin.
For example, on spectator TMF 703, at least three different heads could be chosen, as shown on the photo below.
More variety could be added by gluing the head not straight, but slightly twisted on the shoulders.

   
Four times TMF 703: On the left the later one-piece resin version,
along with three early tin versions.