I played few games with system like that. Stick of thruth or persona 3 comes to mind. I was thinking about doing some kind of system to make weak enemies run away from you, or they instantly lose the battle when you touch them to cut down the number of simple fights. Having some skills to help with that might be nice. Maybe even skills that give you first strike or something like that. Having those skill usable in the overworld is possible also possible, but I will have to think about that.