Fujifilm X Webcam 2 support
I'm using a Fujifilm camera (XT-4) as my main webcam. It's recognized by the system through the official Fujifilm X Webcam 2 application. It's recognized in Skype, Zoom, Discord, Google Meet, and pretty much anything I've tried. However, the webcam isn't recognized at all by Character Animator.
I didn't found any way to make it happen in settings or through the general interface. Using the latest version on Windows.

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Geoffrey Heller commented
Sorry you are having trouble!
I tested an earlier version (2.0) of Fujifilm X Webcam 2 (2.1 is out now) and unfortunately at that time it did not not present the Fuji camera to Windows as a webcam.
You can confirm this by running the built-in Windows "Camera" app. If you can't see your Fujifilm camera in the Windows Camera app then Character Animator likely won't see it either.