Characters are like the people in a story or movie. They are the ones that you get to know and follow along with. Character variety means having different types of characters in a story or movie.
Imagine you are playing with a box of toys. You might have some dolls, some action figures, and some stuffed animals. That's character variety! You have different types of toys to play with.
In a story or movie, having character variety makes things more interesting. You might have a hero who saves the day, a funny sidekick who makes everyone laugh, and a villain who tries to stop the hero. Each character is different and adds something special to the story.
Just like how you like to have different types of toys to play with, having character variety in a story or movie makes it more fun to watch and keeps you interested in what will happen next.