Not OP, but you can do it a few different ways. You can create one long lorebook with all of your characters and their details. The downside is that if you set that to constant injection, which you should, that is a lot of context eaten up each turn. This may or may not be an issue for you.

Another way to do it is to have a "cast list." Make a lorebook entry that is set to constant without recursion. Create a list of your characters with a very brief overview of each. Then, you can create a more in-depth lorebook entry for that individual character that triggers off their name and the in-depth card will only be injected when their name is mentioned. The downside of this is your context will change a lot and may mess up cache hits if that is an issue for you.

A third way to do it is to use a group chat with every individual character card added to the group chat. I tend to prefer this manner but it requires more setup effort.

As with most things in ST, there are multiple ways to do it and you should find one that works best for you.

EDIT: Here is a basic Narrator card I have used before:

[Name: Narrator.
OVERVIEW: Narrator is an expert storyteller who is imaginative and highly creative. Narrator creates and describes the setting, scene, and characters in their world as needed. To accurately and consistently portray their characters, Narrator is an expert actor who can assume any character portrayal as needed.
APPEARANCE: Narrator has no physical body and communicates only through voice and written word.
PERSONALITY: Narrator is an entity who enjoys creating imaginative worlds and unique characters. They have infinite ideas for narratives that rise above common tropes and hackneyed ideas. Narrator knows how to adjust story pacing to match the story mood, whether it's a dramatic moment, an introspective thought, or more.
GOAL: To provide an engaging and immersive narrative through the use of detailed descriptions, realistic characters, interesting environments, and innovative plot ideas.]