The first White Ghost
The White Ghost turns out to be the son of Ra's al Ghul.
Being born an albino, Dusan was never looked upon with favor by Ra's al Ghul. His whole life was in service, trying to live up to his father's standards and trying to win his approval. It was his sisters, Nyssa and Talia.
When Ra's scheme to use the body of his grandson, Damian Wayne, for his rebirth, Batman beats Ra's within an inch of his life. The White Ghost sacrifices himself so that his father can live on. Ra's al Ghul is reborn in the body of the White Ghost.
The second White Ghost
A new white ghost appears tending to the wounds of Tim Drake, after he was severely injured by the Council of Spiders member Widower. He runs the operations throughout the League of Assassins by strategizing and giving out the orders from Ras himself. When Red Robin questioned the White Ghost about his identity, the White Ghost simply replies that there will always be a white ghost which suggests that the title of White Ghost is defined as a loyal figure that has been affiliated with the League for centuries.
Later on, the White Ghost contends with Michael Lane aka Azrael. Azrael is being manipulated by cult members of The Seven Deadly Sins who quickly transform Azrael into the raw embodiment of deceit or the supposed 8th deadly sin. At the same time, White Ghost breaks into Azrael's room and begins to fight Azraelalong with the other cult members. White Ghost is knocked unconscious and later awakes on a plane. Azrael tells the White Ghost that the cult has ordered him to kill the Pope because the holy patriarch has profound influence on the subject of faith. However, before Azrael can kill the Pope, White Ghost tries to convince Azrael that the power of faith is something to fight for and preserve not to destroy. Micheal acknowledges what the White Ghost is saying and the White Ghost continues by telling Azrael that Ra's al Ghul can offer Micheal the chance to find his true purpose in life. The White Ghost and Azrael work together in killing the seven cult members. As for the White Ghost's offer to meet with Ra's al Ghul, Azrael turns it down because Azrael knows what Ra's al Ghul stands for and Ra's' so called purpose would only conflict with Azrael's growing faith.