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So I decided to go through the series that have aired and the next few that are to be aired and typed down the main and main-ish characters.
Next I copied the names into a word cloud generator (Wordle) which shows the most common words as the biggest words. So in the picture, the bigger the name, the more the number of series that the actress/ actor has appeared in this year.
So for actors we've seen Michael most this year, and Kate for actresses. I thought I'd seen Kate loads this year. I wasn't wrong!