We have plan for Custom maids in the future. Players may create them with options to adjust height, face, curve, thickness and so on. Players can also make their own dress by editing base mesh in photo editor program (See maple story 2 for example).
It is definitely possible, to drag and drop V-roid model at run time but we will have issues with animations. That said, we will do contest periodically and select a winner to have their Model integrated to the game =).