"Charter" is said to be one of the last known of many aliases used by a famous elven spy for sale and master of false identities nicknamed The Black Hart, who was contacted by Leliana when seeking steady employment.
Along with being one of Leliana's spies, Charter is also a senior member of the Inquisition and the commanding officer of Caer Bronach. It was also Charter who recruited Scout Harding into the Inquisition.
Charter can first be encountered at Haven by the houses across from the inner gate where she is speaking with Scout Pellane. Later, Charter takes command of Caer Bronach in western Ferelden, near the Village of Crestwood.
Dragon Age: Magekiller
When the Exalted Council is called by Divine Victoria at the Winter Palace, Charter is among the Inquisition presence in attendance. Charter monitors the activities around the Palace while guarding the Inquisitor's personal store of valuable equipment.
If Leliana did not become Divine Victoria...