Prediction is an ability that few users have. These users are able to see into the future of chapters that will come.
The way the prediction method is used is very mysterious. In Black Leg Sanji's case, he uses a floating crystal ball to see into the upcoming chapters. But, in Yountoryu's case, he simply guesses what will happen.
The people with the ability to predict are known as "Predictors."
People with the prediction ability are as follows: