He is a big and tall man, with bright red hair, cut in a military buzz cut, narrow little blue eyes, jutting eyebrows, a thick neck, and a face that looks like it was smashed flat. He looks like a football player, which he played in college. He generally prefers to see things settled in a peaceful manner, but does his job, and is very loyal to John Marcone, although he does give him looks at times to show that he could do things differently.
He also works with Ms. Gard when she is introduced. Hendricks appears dumb, but is actually quite intelligent to the point where he is working on a thesis (which is usually seen in a person going for a doctorate), and has helped take down magical beings many times.
In the series
He later bears the brunt of Gimpy Lawrence's attack against Marcone, killing Lawrence with three well aimed shots. Marcone scolds him for having been too quick in the action, preventing them from interrogating the man.
In Death Masks, Harry Dresden is the target of a hit while meeting with Father Vincent. Hendricks is one of the guards at the exit after the attempt fails. Dresden confronts John Marcone about the incident, with Hendricks and Sigrun Gard backing him. When Dresden, Michael Carpenter, and Sanya need to pursue Nicodemus Archleone, Dresden uses his pentagram amulet to signal Marcone. He arrives via helicopter with Gard and Hendricks, who deliver the group to the train for the final confrontation with the Denarians.
In "Down Town", he accompanies Marcone in a visit to Harry Dresden. He later watches unseen Dresden engaging the golem at the laundromat, reporting to Marcone that the wizard failed to contain the creature. He follows Dresden again until the entrance of Undertown, where he discovers something he thinks that Marcone should know about.
In Aftermath, Maria sees him near Georgia and Billy Borden's apartment, after she was kidnapped. He also wins a bet with Ms. Gard about Karrin Murphy identifying the role of Maria as Marcone's troubleshooter.
In Battle Ground, Gard reveals that his first name is Nathan. In the battle with Ethniu, the titan lifted Gungnir to spear John Marcone. On its descent, Hendricks threw himself in its path, sacrificing himself for his boss; before dying, he glowered at Ethniu and spat in defiance.