If you’re writing a series, you’re going to find that your cast changes over time. This makes sense and is realistic in real life. If your MC is learning, growing, and changing then people are going to leave and come to their lives. They might move, go to school, change jobs, or get a new neighbor. Maybe a family member needs to come stay with them for some unexplained reason.
Sometimes this is great. Some fantastic characters have been added later in a series. Using some TV examples because they’re the best known, here are some later added characters I loved.
Patrick from Schitt’s Creek.
Kimmi from Rugrats.
Ben and Chris from Parks and Rec.
Alex from Chuck.
Natalie from Monk.
Chris from 30 Rock
Jessie from Burn Notice.
All of these characters were great additions to their respective shows.
But not all characters added later in a series are great. Some are Godawful. And the examples of that are downright cringy. Think of Dill from Rugrats, Suzie from Space Cases, Scrappy Doo, and the much despised Bobby from Brady Bunch. This horrible addition trend is so well understood, that it was mocked by the Simpsons in their eighth season.
So how do we do it right? How do we add to our cast without creating a Poochie? Well to me, this involves a series of do’s and don’ts.
Do add something to the story that was missing
Most of the characters in my ‘good’ list fall under this rule. Patrick added a straight man (comedic straight) to a pretty zany cast. Kimmi gave Chucky someone who admired him in Rugrats. Alex gave Casey a softer side that he needed in Chuck.
Do you have a character that is a little too silly? Too responsible? Too damn irritating? Give them a character that has the opposite qualities to balance them out. If your story is just a little too dark, add a character that can give levity.
Do give them a believable and sensible reason to be there.
How did this new character join your cast? Did they move? Okay, why did they move?
Kimmi’s a good example of this. She and her mom joined the cast after the Rugrats went to Paris. Her mom was working for the antagonist, fell in love with Chaz, and moved back to the States with him. That makes sense. Well, not in the real world. But in the lovely fictional world in which a school teacher can afford to keep her family in a house in the suburbs.
As a bad example, we can look at Scrappy Doo. Why is he hanging out with his uncle? Why did we never meet his parents? Why doesn’t he ever go home?
It needs to
Do make sure they fit the style and overall theme of the show
We all know that fiction content tends to have a certain vibe. Some shows are warm and cozy, some are more dark. For this example, let’s consider The Good Place with The Boys. In The Good Place, everyone seems to be a little messed up, but essentially decent people.
Compare that to The Boys, where no one seems like an essentially decent person except the two main characters, Hughie and Annie. And even they, if they were plopped into The Good Place, would seem far too dark and messed up to belong there.
So, as much as you’re trying to bring something new and different to your universe, you don’t want them to be so different as to feel like they don’t fit into the world you’ve already created.
Don’t force this character to take up too much space
Now, we’ve reached the don’ts. And this first one is a doozy.
If you’re adding a new character, you don’t want them to necessarily take over as the main character. So they shouldn’t be treated as such. Yes, they should have some storylines. Yes, they should take up space in the world. Yes, they should be important to the plot. But they shouldn’t be the new focus, to the detriment of other characters.
A great example of this done wrong was Rugrats. Dill took over too many of the storylines. Now that there was a baby who needed looked after and cared for by the rest of the cast, every story had to be about him in some way. Before, each episode told a story of one baby, or the assembled cast facing a problem. Now all the problems were about dealing with Dill. Or they were exacerbated by his presence.
Honestly, did Stu and Didi never actually watch their kids?
Don’t take the place of existing characters
This one is a personal issue with me. And it started young. I’m likely dating myself here, but when I was a kid I loved the show Space Cases. It was kind of like Voyager, but with a younger crew. A ship was lost in way outer space, carrying two adults and a group of teens. Scifi hilarity ensued.
My favorite character was Catalina. At the end of season two, she was replaced by her best friend Suzee, who until this moment most of us thought was an imaginary friend.
And I never got over that.
Of course, if you’re writing anything that requires actors, you’re sometimes going to have to replace people. I had a few actors leave my podcast between seasons one and two.
Some of the characters I recast. Some I simply wrote out and didn’t replace. But if you’re writing for TV, you can’t always just replace an actor.
(Yes, sometimes it can be pulled off.)
Then there are examples like Space Cases, or Charmed, where an actor leaves and their position is simply taken over by a new character. And that’s a jarring situation.
If you’re writing a book series, you don’t have to worry about actors leaving. So you do not ever need to shoehorn a new character in to take the place of somebody else. So, you know, don’t do it.
Don’t add a character just because they’re cute
Alright, you all knew this was coming. That’s why I saved it for last. I have some words of revulsion for the Scrappy Doo, Dill Pickles, and Cousin Oliver sort.
We do not need a character added just for the sake of being cute young and new. We don’t need it. If you find yourself writing a new baby, a new puppy, or a new adorable pet sidekick to keep things interesting and fresh, stop right there. Your story doesn’t need it, and it won’t be the saving grace you think it would be. That stunt has worked once and only once, and that was on Sailor Moon.
I hope this post has helped you. And I hope I didn’t trash-talk a character you loved. If I did, please let me know in the comments. And if there’s a later addition character I didn’t reference that you think deserves some love, please let me know about them too.
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And don’t forget that Nova, book five of Station 86 starts on Monday! And yes it does have one later series addition, a survivor from Station Central. See you then.

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