@FanOfMostEverything  
film one: villain reject their Humanity.  
film two: trio of ancient evil resurface.  
film three: villain and hero use same power.  
film four: villain use their power to protect their quiet lifestyle.  
film five: villain must be unmasked then tranform in a larger fabulous form.  
film six: villain take memorie away.  
film seven: villain replace peoples with different versions.
 
from there it diverge