Sounds like you want the 2D Animation Package. You can use it to rig your characters. https://forum.unity.com/threads/2d-animation-preview-packages.521778/ They were working on SVG importer support but I'm not sure of it's ready yet, try it see what happens. If not you'll have to import your svg into photoshop first. Again they also didn't have layer support last time I checked. Check out the tutorials, you have to space all the limbs out in the file. Good luck!