It looks to me as though you need to use the verb you defined, “to clone.” So instead of “James is the clone of John” you would write “James clones John,” and instead of “an NPC is clonable if they become more than one NPC” you would write “an NPC is clonable if they clone more than one NPC.”
Also, I suspect that you want to say “An NPC can be a clone or original”; as it is you are defining two on-off properties, “clone/not clone” and “original/not original,” when I think you want those to be alternatives to each other.