Does my database design work? Newbie!

I've uploaded an image of my database design below. This is the first database I have designed and I was hoping that I could get some input into whether or not it is set up correctly or if I just have no idea what I'm doing! It is for an rpg game. Thanks so much for your time.

Overview of what it should do:

• Each user should be able to own multiple characters,


• But each character should be owned by only one user


• Each Character should have only one location


• But many Characters can exist in one location


• Each character should own one container (inventory)


• But each container should only belong to one character/NPC (a container cannot be owned by both a character and an NPC)


• Each container may or may not have only one location


• 
  

  But one location can have many containers inside of it

  
  


• 
  

  Each item/weapon/armor should either exist inside of one container or have one location

  
  


• 
  

  But one container or location can have many item/weapon/armor

  
  


• 
  

  Each NPC should have one location

  
  


• But one location can have many NPC