there is a free 3d stick figure software available at http://stickman3d.com
the software provides you with a 3d stick figure
you can drag the stick figure's bones
you can change the length of each of its bones
you can zoom, pan and rotate the camera view like any other 3d software.
when happy with the stick figure posture, you can take a screen shot and use it as a guide for drawing comics, cartoons, manga, anime, people etc.
check it out. its completely free and loads in you browser when you download a small 3mb plugin.