The central character is devoid of any redeeming features—zilch, not even a nuance, which gives the story a politically incorrect tone.
If you start with an Em Dash do you need one after nuance or is it fine. I prefer it without whether it's wrong or not.
Your preference is immaterial. So is mine. If you start an internal parenthetical with an em dash, you have to exit with one.
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Your preference is immaterial. So is mine. If you start an internal parenthetical with an em dash, you have to exit with one. It is just like if you started with an open parenthesis and used a comma to close:
The central character is devoid of any redeeming features (zilch, not even a nuance, which gives the story a politically incorrect tone.
How does that look to you?
Rules for the use of dashes are a bit loose. Dashes should be avoided in formal writing.
There is always a way to express your meaning, often more clearly, without using dashes.
Clive