Here is the reference image for the tutorial. You can use this to help you create your 3D model.
Here is another tutorial.
And the reference image that is used in the tutorial:
There is another tutorial that I found useful. This one is written in Japanese and done in 3DS Max, but there are a lot of pictures and you can see another person's approach. It very similar to the video playlists above and it does not explain all the steps in detail, but the this character is simpler at parts and so you might want to combine the two to make your characters more quickly.