This is a very interesting modeling tutorial to create characters (although it´s not a Blender tutorial).

It explains how to build the basic parts of a character of a simple model, really useful for begginers.

Cartoon Character Body Modeling Tutorial - Part 1

Cartoon Character Body Modeling Tutorial - Part 2

I was making a research to learn more about creation and modeling (to aply to my character) and I found a really cool thing. Nerd engineers really crazy! Yes... They build their own sci-fi movies characters, in this case, Wall-E.