Could've Been King

The Could've Been King led the Army of Meanwhiles and Neverweres during the Last Great Time War. The Tenth Doctor described this as one of the potential horrors that would be released when the Master broke the time-lock on the war, along with the Nightmare Child and the Horde of Travesties. (DW: The End of Time)

This individual could have been a paradox or a person removed from time as he was called the "could have been king" and he led an army of creatures that likely didn't exist and they might have served him as he might have promised them life.