Some interesting speculation on the relationship between Nicholas and Angelique. Â I feel that the main connection is that they both serve Diablos, and probably have known each other for centuries. Â Of course, Nicholas is much more powerful than Angelique, and he enjoys never letting her forget that fact! Â
You know, after viewing these first few episodes with Nicholas again, and trying to watch as though I know nothing about the series and I'm seeing it for the first time, I think my initial impression might be that Nicholas
is The Devil. There's his overall look, for one thing: the eyebrows, the hair, the mustache, the dapper suit and black gloves; and his name, Nicholas - isn't Nick one of the Devil's nicknames? There's also his mention of his and Angelique's "bargain," as though he is the one who allowed her to live again (after she was destroyed in 1796) so she could get vengeance on the Collins family.
Perhaps they initially did intend for Nicholas to be Satan himself and then backed away from it. In one of my books (the DS Tribute book, I think) it says they did start out have The Devil as a character but backed off from that and demoted him to A Devil instead. I assumed they were talking about Diabolos, but perhaps they were referring to Nicholas?
Note the "bargain" between Nicholas and Angelique never comes up again.