The Character properties display in the Properties window when a Character asset is selected in the Scene browser. These properties also displayed in the Character Settings. See Character Settings Reference for more information.
Character assets are composed of all of the data that defines a character model and links it to a motion source. These Character properties give you ways to adjust the solving, retargeting, floor contacts, pull, stiffness, and many other properties associated with that asset. When you modify a Character property in the Properties window, it is also updated in the Properties area of the Character Settings.