For a 2D character rigging I can’t think of a course or video off the top of my head.
For a 3D character like that you can use the ball rig and then add the arms and legs. For the ball rig
https://cgcookie.com/courses/ball-how-to-rig-the-ultimate-ball-in-blender
For rigging in general and basic arm and leg rigging you can watch CORE rigging course.
