Not sure if you are familiar with these from the Unity asset store. Excellent RPG systems that I have used extensively and a good place for inspiration and suggestions of things to be implemented. Since I am in the process of porting my projects to Unreal your Kit looks very promising. looking forward to more pics or vids showing the different systems in action.
Take a look at these if you have not yet.
Plygame- Unity Asset Store - The Best Assets for Game Making
ORK-Unity Asset Store - The Best Assets for Game Making
Atavism online-Unity Asset Store - The Best Assets for Game Making