Umm... I was deciding whether or not to add blood. I decided against it since I figured that would put it over the line from poignant to tasteless.
But since there are two characters, and two characters which are actually hostile to one another as opposed to any other two-character units in Civ, they are brutalizing each other. As such, you actually get to see it... whereas most units are killed by some unseen force.
Basically, when it comes to this, the units tend to follow two basic lines... in Death animations, the Slaver kills the Slave... or wounds them or does something to them and then runs like hell. In the Capture animations, the Slave usually does something to the Slaver... rising up of sorts.
While I discussed this issue with Kinboat, I figured I'd let you guys brainstorm here...
One of the main problems with units like these in mods and scenarios is such:
Let's take a Nazi slave unit for example in a WWII scenario.
Now, if we have this unit produced only as a "enslaved worker" unit, then only the Civ that lost this unit will be able to capture it and restore it to normal. Otherwise, if the Americans capture a Russian "enslaved" Nazi worker, it will become an American enslaved Nazi worker complete with Nazi guard... that makes no sense. And if you allow this unit to be create by means other than enslavement, then that doesn't even work for the Russians.
Two other possibilities Kinboat came up with is 1) is making them unable to be captured so that the worker unit is destroyed and the workers "go home" to add a little more depth to the story in our imaginations.
Or 2) is to create a tech that the "good guys" get that can allow them to upgrade the units for free to normal-looking workers.
Now, some of these units will have different varieties... for example:
The Asia, 1931-1945 set will include two units - One will be a Japanese soldier with an Asian slave, the other will be a Japanese soldier with an American/British POW. (Note: I'm not making an American AND a British POW... just one. The clothes will be tattered enough and it'll be small enough that it could be either. But if it's not satisfactory, then I wholly encourage you to CnP it to your liking)
The Trans-Saharan will have an Arab Slaver with an African Slave, and an Arab Slaver with a Slavic Slave
The Soviet Russia, 1918-1991 set will have an Industrial-era Soviet soldier with a worker and a Modern-era Soviet soldier with a worker. So whether under Stalin or Gorbachev, you'll be set.
The Slavery in the Americas set will have two Industrial era units which I'm keeping under my hat at this point, but suffice it to say, one will serve well as an early Industrial and the other as a late Industrial.