Not sure if this is what you mean, but the pwEffect shader has a great phantom preset which ensures you don’t get things like the teeth and eyes visible through the skin. It’s ideal for making translucent characters. Here’s an example I whipped up in about 2 minutes. It’s quite a striking effect.
I actually bought PW for exactly this purpose but am not able to get these kinds of effects so I was going to plan B. Perhaps someone could help me with this.
The shader used in that render was simply called “Phantom”. With some surfaces you might need to hold CTRL when applying them in Daz and choose ‘all’ instead of ‘selected’ in the dialog which appears. Not often, I digress, but it happens occasionally.
Other non phantom objects will be visible behind the spectre, but any other ‘ghosts’ or similar transparent objects will not be. If you need help with specific instances, feel free to either reply or send me a PM with your query and I’ll do my best to help.