I haven't seen more than a few episodes of The West Wing, but what caught my attention about this discussion
was the issue of age and the concept of the "entry point character." I think it's easy to see where age might affect who one relates to within a canon (as well as one's viewpoint on many of them), but I also wonder if others have found their entry character ending up not being the one who keeps them in the fandom?
I was equally surprised by the fandom focus on Darcy, especially since I thought Jane was an interesting character. Despite her attraction to Thor, her main focus is her work and her scientific curiosity, and one could see her as fascinated with him even if he weren't, well, a Norse god.
I did like Darcy, I thought she and Jane were fun together, but it surprised me that a nerdy fandom didn't identify more with the science nerd (especially since Science Bros was soon to be a thing). And while many took the opportunity to pair Darcy with Loki (who was very clearly the more popular character), I always thought it would make more sense for Jane and Loki to find things in common. Yet there are relatively few Jane/Loki stories.
I've tried thinking about recent shows I've been watching and if there are any particular characters who draw me in. I find that mostly I can't dislike the main character but I may prefer a different one. So, for Victoria it's varied depending on the season, for Good Fight it's Maia rather than Diane, and for Brooklyn 99 it is probably Captain Holt because I find him the funniest. Overall I find it's the writing that draws me in more than particular characters, but then the last fandom where I was mostly interested in characters was Merlin.
In that, I grew to love the characters in spite of the show and Merlin was the entry point to that. However I found that by the end it was Arthur who was my favorite. (It might well have been Gwen but the secondary characters were so poorly developed that I liked Gwen's potential more than what we actually got). I think it was because he had both established himself as a good leader, as well as because he was, unknowingly, being ill done by so many people even as he tried to become a better person.
What about you? Are there particular characters who are always your entry point? Does it change over time? Does it depend on the canon?