Hi...
You can certainly create a custom character to sell using Character Creator alone.
The term "sufficient modification" means that if you are using an existing base product, you need to customise it so it no longer resembles the original. So for example, if you used a base outfit such as a dress, you would need to completely retexture it so that it looks like a completely new outfit.
On the flip side, if you were to take say the included Kevin character and just change a couple of facial features like the nose and eyes, then this would not be considered "sufficient modification" and be rejected. Instead you should ideally start with the neutral base in CC4 and create your character from scratch using the available morph sliders to create something completely unique.
Peter
Forum Administrator
www.reallusion.com