Yes, I know this was suggested before. I'm not suggesting an animation bone tool, but something more like literal bones and joints. You set a fixed length as a guideline and are able to draw an arm, a leg, or a torso over it. Maybe guidelines for facial structure as well. It would likely make drawing characters a lot easier, especially if you can customize the proportions, the scale, the shape, and remove the facial guidelines for characters without faces.
It'd be nice if this plugin contained not just a tool, but a file type that could preserve the bones in an image and display it in a similar way to a PNG file output for the icon thumbnail.