@Vulpes_Inculta, thanks so much!
@Voiddweller, you are right! You are a genius. The game gives PROF mutations, which are just flavor (from what I can tell.) Perfect to hook new character sprites on to them.
There can be sprites for police, cybercop, SWAT, detective, marshall, medical doctor, churl (starting profession for illiterate peasant scenario) and martial artist (both orange and black belts). Ooh, and skater! Adding new ones shouldn’t be too tough either.
Here’s a proof of concept for the black belt:

You can get it here for 24

Or here for 32.
This changes the character sprite for the blackbelt profession.
If you would like to change your character sprite without starting a new character with the blackbelt profession:
[ul][li]Install this pack (completely delete or rewrite the ChestHoleTileset or ChestHole32Tileset directory with the unzip of the above) [/li]
[li]Hit 9 on the debug functions menu [/li]
[li]Then type: / (to bring up the find menu) [/li]
[li]Then type: bla to select black belt.[/li]
[li]Hit enter to accept.[/li][/ul]
Edit: Here’s a new version of 24, where I do:
Doctors (well, medical residents) naked and with clothes:


And Skaters, naked and with clothes:


32 is coming up, I actually just lost 32 because my computer crashed while I was saving.