Complete Monster: The one armed man, arguably. Not only does he murder a woman, he lets an innocent man be accused of it for four years. His monstrosity is on full display in the finale, when he murders the bail bondsman who posts his bail, and then he decides to try to kill Kimble and telling him, "Yeah I killed your wife and now I'm going to kill you.
Deal with the Devil: In the finale, the bail bondsman who posts the one armed man's bail. The bondsman attempts to cut a deal with the one armed man. It ends very badly for him.
Fridge Logic: Notably averted, in that the show's very premise provided the answer to a couple of questions that earlier Walking the Earth series such as Route 66 had left unanswered: why don't the protagonists just settle down in one place, and why solve the problems themselves instead of calling the police?
The Untwist: The final 2 episodes are a 2 part story. In Part 1, the One-Armed Man is caught and held in jail for an unrelated crime, but is inexplicably bailed out by someone else. He tells the bail bondsman that he didn't kill Helen Kimble but saw who did and it wasn't her husband. When Kimble breaks into the bondsman's office later, he finds the bondsman dead, murdered, and sees in the bondsman's file that the name of the person who paid for the One-Armed Man's bail is...Leonard Taft, Kimble's own brother-in-law! People began speculating that Len would turn out to be the killer. In Part 2, it turns out that, nope, the One-Armed Man was just lying to the bondsman whom he then murdered. He really did kill Helen. It even turns out that Len wasn't even the guy who paid the One-Armed Man's bail. Instaed it was a next-door neighbor who had witnissed the One-Armed Man murdering Helen and told no one about it, who paid the bail using Len's name.
The Woobie: Kimble, of course. It's an essential part of his Plot Armor. Everybody Kimble meets will either 1)instantly believe he's innocent, 2) will realize he's innocent by the end of the episode, or 3) be a guilty criminal. And Gerard.
Complete Monster: Dr. Nichols. As despicable as the one-armed man was, he was merely hired muscle. Nichols? Arranged the murder of Kimble and his wife, did absolutely nothing while Kimble was tried, convicted, and sentenced to death, then acted as though he were aiding Kimble in his efforts to prove his innocence, while in reality he was again planning to have Kimble killed. He did all this while pretending to be Kimble's friend and all for the money he was going to make off of a pharmaceutical deal.