Cool, glad you found where to set the player character.
You should be able to use characters you've made with Character Creator 2d. Depends what level of integration you're after. You can definitely import the pngs that Character Creator exports, and then create your anims from those, (same as you would if you imported them from another art program). I'm not sure how they set up their prefabs/animations but it might be possible to get their exported animations working too.