The person who has been most damaged by the release of these documents is Benedict XVI. Several newspapers and a even book released several of his private letters and reports he signed off on.
The other person that seemed to be a target is the Vatican's Secretary of State, Cardinal Tarcisio Bertone. He serves as the closest collaborator of Benedict XVI and is criticized in a number of the documents. Many believe the letters were meant as a way to discredit him.
The third protagonist is Georg Gänswein, the personal secretary and shadow of Benedict XVI. He is being continuously updated as the investigation continues. He was the one to inform the pope of the butler's arrest.
So far, Paolo Gabriele is the only one being held in this case. He has been charged with aggravated robbery and he has agreed to cooperate.
In charge of the investigation is the commission of three cardinals that was created by the Pope on April 24. They were charged with finding the source of these leaks from some of the most protected walls in the world.
Heading the commission is the Spanish Cardinal Julián Herranz, who was prefect of the Pontifical Council for Legislative Texts from 1994 to 2007.
Working with him Cardinal Josef Tomko from Slovakia and the Italian Cardinal Salvatore De Giorgi. All three men are trusted by the pope and have unlimited access inside the Vatican.
Then there's Domenico Giani and his 100 officers of the Vatican police force who helped to investigate this crime. Giani is the main point of security for the pope and all his movements.
This case may end up in the Court of Vatican City, located behind St. Peter's Basilica. The judge in the case would be the Italian Piero Antonio Bonnet and the prosecutor would be Nicola Picardi.