I want to animate my own characters using the Snow or Rain Rig provided by Blender. Are those Rigs bound to the Snow and Rain Characters or can I use them for my own characters?

If its not possible, does anyone know how to use external rigs on own characters without building everything from scratch?

I want to animate my own characters using the Snow or Rain Rig provided by Blender. Are those Rigs bound to the Snow and Rain Characters, or can I use them for my own characters?

If it's not possible, does anyone know how to use external rigs on own characters without building everything from scratch?