Know is a minor character in Phantom Dust. His ability is to jump.
He is very cocky but is one of the more intelligent characters in the main game. Does not work for the Visions, is actually a mercenary. He likes to use powerful skills with unusual effects like "Memory of Battle" and "Restrain". When Guard is discovered he is given the job of training it.
His memory is lost, and Guard watches over him and tries to make Know go renegade along with him. Thanks to the protagonist however, Know is rescued, but he is never the same again.