Vanessa Ekwensi is a recurring character since Career of Evil, isn't she? Wardle, for some reason, wasn't in it but still, he was there from the beginning.
I don't think so. I know some fans want to see more of Charlotte but in the books she's continuously used as a plot device, to be that toxic presence over Strike's entire romantic life, that he tries to overcome since the book one. I do think that in Lethal White Charlotte was shown as a parallel to Lorelei, with whom Strike actually had a good healthy thing going on because Lorelei is not a Wicked Witch of the West Charlotte is.