What are some options for adding customized characters for someone new to it?

Back in the UDK days I attempted to develop a Standardized Customization system called Universal Modular Entity Construction Hierarchical Sets (UMECHS).I believe Epic intended to build a standard with the UE4 Mannequin, however, retargeting negates it. I believe that a group of Marketplace Publisher could collaborate to build a standard character and parts catalog.