I must say, I haven't watched a single episode of Killing Eve. But I've got a very good alibi...
The author Luke Jennings said about his character "She came to me fully formed and it was clear, adventures needed to be made for her." I've also had a similar experience with some of my characters who were initialy based on real people. I just had to intensify flaws and add nastiness, sparingly, to make them fiction worthy.
I also liked this bit "we are most drawn to how she lives her life - she is completely carefree" and... "There's no part of her life that she isn't in charge of." This gave me a warm feeling, because it just sounds like my MC. Whether I'll succeed in writing / showing her that way is another story, but it looks like I've got a very good premise that is already a winner with audiences.
But that's where similarities end: I'm writing a romance, not a crime novel. Yet, the line "she loves having nice things", made me think of one of my secondary characters who just lives to shop.
When it comes to clothes and food, this article shows how they can be a strong element of characterization. Like the image of Inspector Morse in a tweed jackect, drinking a pint, it endures.
But enough from me. What about your characters?