Included at the bottom right is my long running robot villain. The appearance is in its post-war form, and after escaping post war slavery and becoming a member of the cult of knowledge. This picture would be before amassing a following.

Bottom left is another major character who was an artifically created human with modification using radiation from the mysterious crystals that are not well understood, but power faster than light travel in the setting.

Mid-right is a suited figure that appears in apocalyptic visions to some characters.

Top right just some enslaved robots during the post-war period.

Top left is a spacial anomaly relating the the crystals in the setting.

The Mad Max looking guy is just some rando, and the frog guy on the right is just an unknown member of his species sporting some cybernetics.