Personally I would prefer to focus on humans for now, so that we can create infinitely many different person before eventually jumping to other races.
Viewing post in Absolutely Gorgeous, Any Plans for Non-Humanoid Characters
There are currently 19.6mil combinations possible - and that's without counting bust options (head, nose, eyes) and colors!
So if you encounter let's say 100 NPCs per minute in an open world game, it would take you 136 days of non-stop gaming to encounter every possible character made with our character creator :)