Here's the idea:
Unique Shen and Rahasia heads
Contrasting clothing for the Sandrals versus the Matales
Alternate Old Commoner heads for Ahlan and Nurik (since at least those heads are underused in the game proper)
Swap out Casus' generic corpse for one of the appropriate look/skin tone
The only part I'm having trouble with is this last part. I would think the simplest way is to copy how the game does Nemo's corpse (invisible placeable with the dead NPC placed on top of it), but the tutorials I've seen either don't address this skill or assume greater knowledge of scripting than I currently have.
Any assistance would be greatly appreciated.