Once you have a characterized skeleton, you can create a Control rig for your character. Characters must have a Control rig in order to receive retargeted animation.
Select
> Create > Control Rig.
The Control rig effectors are created based on the structure of the skeleton of your character (defined in the Definition tab).
To change the appearance of existing Control rig effectors:
In the Character Controls window, select
> Edit > Controls > Rig Look, then select the effector type you want:
Rig Look A. Box B. Stick C. Wire