Warden Donald Morgan

The Dresden Files series features a complex and diverse cast of characters.

Species: Human (Wizard)
Description: Private investigator, Regional Commander of the White Council's Wardens, Knight of the Winter Court, Warden of Demonreach Prison

Harry Blackstone Copperfield Dresden is a wizard and the protagonist of the series. He works as a supernatural private investigator in Chicago, dealing with paranormal crimes and consulting for the Chicago Police Department. The novels are written from Harry's perspective, in the style of hardboiled detective fiction. In the television series, he is portrayed by Paul Blackthorne.

Species: Spirit of intellect/air elemental
Description: Repository of magical knowledge

First appearing in Storm Front, Bob is a "spirit of intellect" who inhabits a skull perched on a shelf in Harry Dresden's secret lab. He is bound to the skull and its owner's wishes. He is free to leave the skull if given permission by his owner, but he will die if exposed to the sunrise without a host body. His usual vessel is Harry's cat, Mister, who does not seem to mind Bob's presence. He is a major character in both the book and television series. In the television series, he is portrayed as an incorporeal human bound to the skull, and is played by Terrence Mann.

Species: former Human (Wizard); now High Sidhe (Winter Lady)
Description: Apprentice to Harry Dresden from Proven Guilty until Changes, Winter Lady as of the end of Cold Days

Starting as a supporting character in Proven Guilty, Margaret "Molly" Katherine Amanda Carpenter is the daughter of Michael Carpenter. She seeks out Dresden's help when her boyfriend is arrested as a suspect in an assault. As Harry investigates the case, he discovers that Molly has manifested as a wizard and has been unwittingly using dark magic in an attempt to help two friends shake off their drug addictions. By outmaneuvering the Merlin at Molly's trial, Dresden stalls the trial long enough for Ebenezar McCoy, Martha Liberty, and Injun Joe to show up, along with Molly's father, Michael Carpenter. With their help, Dresden manages to keep Molly from the Council's death penalty. Instead, the Doom of Damocles (a form of probation) is placed on her, with Harry assigned as her supervisor; if she breaks the Laws of Magic again, both of them will be executed.

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Wikipedia