Diavolo is obsessed with erasing his history and keeping his presence a secret from the world. Because he believes that the mistakes of the past or simply the past itself is something that needs to be conquered and destroyed, he is afraid that someone will find out about him. He's Stand is King Crimson, an extremely powerful Stand with immense physical strength and the ability to erase time up to 10 second and predict everything that will happen within the next 10 seconds.