You don't necessarily have to create characters (VRM) by yourself as you can use existing VRMs on THE SEED ONLINE.
This page describes the following:
* Licensing page under creation
When someone tweets about an character (VRM) from THE SEED ONLINE, a hashtag #TSO_ITEM is added by default. Therefore, you can search #TSO_ITEM VRM on Twitter to find interesting items. You can also see the list of publicly available items on THE SEED ONLINE.
Launch Virtual Cast client software and link with THE SEED ONLINE.
Link Virtual Cast with THE SEED ONLINE