Here is another tutorial / in depth guide on creating cartoon characters by one of my favourite inkscape tutorialists, David Shaw. A while back, he published an awesome guide to creating a simple cartoon character in the tutorial Slime to Start.
This time he has created another in-depth guide to character creation with Inkscape, and this time the goal is to create a cute cartoon stick man with a style similar to the Order of the Stick by Rich Burlew. Once again, David goes into immense detail of his entire creative process, and the result is a great introduction to inkscape with an awesome result.
For those of you interested in cartooning in inkscape, make sure you check out the following screenshot by Inkscape artist / developer, John Bintz (of Moment of Clarity fame.) It outlines the workflow that John goes through tracing, tweaking and inking his cartoons. Note that the screenshot is done before the 0.46 paint bucket tool came out (which i am pretty sure john had a hand in developing) so cartooning in inkscape is even easier.