Hi georgewhite331,
These Character Object rigs are driven by controllers and lots of parts interacting with each other. The joints can’t be moved by itself, i.e., nor via transfer options)
My understanding so far is that the Character Object cannot receive this information provided by the Character Definition tag. It is based on the initial setting of the Mixamo Rig, as Jonas Pilz showcases this here:
https://www.cineversity.com/vidplaytut/how_to_create_variations_of_mixamo_animations
There is even an ready to use Character Object available in R23:
https://www.amazon.com/clouddrive/share/cYKCEmap0ttgg4dIu4lczRaEi875G1yijMO7d5ikOI3
As you can see, there is a rig on top of that Character Object. The rig itself is based on the Mixamo Rig. I went through all rigs, just in case, and this is the only one providing the Retarget option discussed bu Jonas Pilz.
Except for the Mixamo Rig, I see no option to use the Character Definition/Motion Solver combination here, especially not with the Toon Rig.
The other way is to make the Character Object editable, and use the Bind Joint hierarchy and use the Motion Transfer. The downside is that all the options from the Character Objects are gone. The way Jonas showed it would be my suggestion.
If there is an option, I’m not aware of it, nor can I find any information about it. Again, these Character Object rigs are built to work with controllers and have no direct option to rotate, scale, or move the joints.
All the best