
Keep the main design the same, but if there are many collectors there should be subtle appearance changes between them to keep them unique :)
Different head markings would be sick. Every human has a unique fingerprint, the Collectors can have unique markings.

I think it’d be super cool if they were in different colors depending on where they are located, some could have darker shades of the cyan that they currently have. They could have battle scars and maybe even slightly different features.