Descendants one was like when you first meet the vk’s and their Personality
Then descendants two was how tough it was for Ben and mal
Then descendants three is how it doesn’t Matter which of the barrier you come from there are two side everyone can chose from good or evil
All the descendants movies have in common is that it has a lesson
All the descendants movies have different from each other is that there are different villains in each movie like d1 is mal, Evie, jay, and Carlos d2 it was Uma and in d3 it was Audrey