V4 and M4 are figures, not characters.  They can be purchased from Daz3D.

You can purchase the head/body morph packages as well as character addons (also called morphs) that will change the shape/look of each of the figures 

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi