On the Manage Ownerships screen, each of your characters is listed with a "Create an Ownership for this Character" button. Creating one gives that character its own inventory and wealth (and resources), tracked separately from your main pool. If a character is later reassigned to another player, its ownership — inventory and wealth — moves with it to that player. You can also rename your main player inventory here with the "Rename" field.

Controlled NPCs (NPCs a player manages) appear in this list too, so you can track their wealth and inventory the same way.

Create an Ownership for this Character Button