Well, the pic isn't 3D characters, but rather a pic of real plush dolls. But you can create models like this using an easy to understand 3D program like Milkshape 3D. With it you can make models that you can use in DBPro. Check the trial version at http://www.swissquake.ch/chumbalum-soft/ .
I'm no wiz at creating models, though. But it's like drawing, really, just in 3D. And as for texture, just make some in paint, so that you can test it out. You put the textures on in milkshape, too. Only thing you've got to do in DBPro is load the model.
Making a 3D model like those isn't really a big deal.You could probably create one in Milkshape by using five cylinder objects and a sphere object(Plus something for the hair), and then shape the cylinders to look like arms, legs and body. (Use the sphere as a head, ofcourse.)
Here's an example of a model made I made in Milkshape: http://www.deviantart.com/view/25023972/
It's made of 22 cylinders, 1 box and 1 sphere. A pretty easy model, actually.
Hope I wasn't too confusing for you, and hope it helps. Best of luck to you!