Adventures in reading: should a series character change?

I love a good series. They're my comfort food, whether on TV or on the printed page. I already know the characters, know what story to expect... When my brain needs a break, I read/watch a series.

But sometimes, a series is just... Done. And it seems that's largely up to the writer. I recently read two 'big name' mysteries, series that had been going for a while (one was on book #30!).

One book had its detective character change, as you would expect a real person to. He was no longer the outspoken, slightly unstable hero from the beginning, but he still had a bit of rebellion at his core. This detective grew up. I liked this book a lot.

Another book had two series characters, and although the mystery was good (really good, actually), the characters were completely flat. It was like the author had decided they weren't people who could change anymore. They were just there to deliver the mystery. Disappointing, to say the least.

What do you think? Should a series character change?

Is it possible for a series to be enjoyable without character change?

What's Your Favorite Series, And Why?

As much as I love a good standalone novel, sometimes all I want is my favorite series. There's just something comforting about opening up a book or turning on the TV, and finding a familiar face. Even if it is fictional.

I love Michael Connelly's books for this reason. Tess Gerritsen is another favorite. On TV--well, that's pretty easy. There's Bones, Leverage, and the new Perception (boy, did that series find its groove toward the end!).

From the writer's perspective, I love writing series characters. As I start thinking of the next book in Linc's adventure, I already look forward to hanging out with Henry and Ben, and Linc's family. It's like meeting old friends, and finding out what's new.

What's your favorite series? Why do you love those characters so much?