TuesdayTips71

Nice To Meet You Again!
Writing Returning Characters.

One of the fun things about writing a series is revisiting characters that you've written about before.
It's also one of the reasons that readers will return to an author (and why publishers love a series!). I have a number of favourite authors whose latest novels will always find their way into my shopping cart. In part, it's because they've proven to me in the past that they can tell a good story, but I am also keen to check in and see how my 'friends' are doing in their latest outing.
It's natural for a writer of a named series to assume that the person the series are named after is the one that readers will connect with the most and to expend the most creative effort in crafting this character. But that isn't always the case. I've written before about M.W. Craven's Washington Poe series - Poe is a terrific character, but there are a large number of readers for whom the most enjoyable parts of the books are those featuring his sidekick Tilly Bradshaw.
So for that reason, it's worth putting some thought into secondary characters beyond the main protagonist(s).

These recurring characters can be broadly divided into two groups.
Those that appear in each book and those that appear infrequently, when I need them.
Characters in every book.
For my DCI Warren Jones series, I have a regular cast of characters that appear in pretty much every book. Warren and his team at Middlesbury CID and his immediate family are series staples. Therefore, it's worth putting some time into these characters. Don't simply make them a foil for your lead, give them personalities and a life of their own.
It is normal for a lead character to evolve and change over time. The events in one book may have lasting repercussions for example. But don't forget to consider others. I've written before (Tuesday Tip 39) about how keeping notes on regular characters is important. They will age, they will go through life changes and given that they are probably working alongside the lead during the crises that they face, they too will be impacted by traumatic events. 
Infrequent characters.
As my series has progressed, I also have a few regulars that crop up periodically. For example, I have a civilian Digital Forensics specialist who pops up whenever they need a laptop or a phone unlocking. Pete Robertson typically only has a few lines, and in some books is sometimes only referenced, but over the series we learn nuggets about him. For example, he is extremely tall and thin - almost as though he has been stretched - yet he somehow squeezes into a tiny office without ever knocking equipment flying. We find out in passing that he is gay. It's not really part of a story, but it makes him a little more rounded; maybe it will be important one day, maybe it won't.
In one of the novellas, At First Glance, I needed an officer of similar rank to Warren working on the drugs squad. Lo and behold, I suddenly found I needed him again a couple of books later. He'll be crucial in my two next books, so I now know his family background.
In next summer's book (number eight), I bring back a character that hasn't been seen since book two, about seven years previously. It wasn't a conscious plan, I just realised as I was writing a scene that the as-yet-unnamed officer delivering a briefing played a similar role to a junior officer that worked with the team in the earlier book. I went back to the original manuscript and found their name. Given the number of years that had passed, I decided she was due a promotion and was now a specialist with additional expertise. As a bonus, I didn't have to think up another new name!
The pitfalls of regular characters.
Something that writers need to think about when bringing somebody back is how much space to devote to reminding readers who they are, or introducing them to new readers. It can be a bit of a balancing act.
Similarly, will their appearance potentially spoil earlier books in the series? A few posts back (Tuesday Tip 52) I wrote about how there is always the risk that big plot developments in earlier books can lose their impact if their resolution is referenced in later books. Many readers new to a series read them out of sequence, so if PC Blogs is very clearly alive in book seven, they obviously survived being stabbed in book five. Consequently, you may wish to reconsider if you want to bring back an infrequently used character if it robs that earlier story of its tension.
Bringing back a villain or previous suspect might be even more dangerous. If character X is a key murder suspect throughout book four, then having them out and about in next year's book indicates that they were probably a red herring in book 4!  

Do you have any favourite recurring series characters?
As always, feel free to comment here or on social media.
Until we meet again,
best wishes, Paul.