Cynicism Catalyst: Petra was more duty-bound, like Jinjur, when she was willing to support the Ozian army in their fight against the Phanfasms. However, after her brother went missing during the war and the Ozian army presumed him dead, Petra defected from the army and started her own detective business while continuing the search for her brother, complete with hard-boiled cynicism as a result of the experience.
Guile Hero: Petra's main tactic in going forward in her investigations is to manipulate and influence suspects to give up information. This is especially evident when she goes undercover to find Frogman's files, and when she hires Lion to argue in favor of her ambassadorship so that she can legally travel to Phanfasm Island to find her brother.
Hardboiled Detective: Parodied with Petra. She's more snarky than she is cynical, and is addicted to coffee, not alcohol.
Street Smart: Petra never had the chance to attend university, but that doesn't make her any less clever and intuitive.
(The Cowardly) Lion
Amoral Attorney: Lion charges ridiculous rates for his services, at least up to 10,000 emeralds on average. As seen in his conversation with Scraps, if customers can't pay, Lion usually sends goons to rough up or sabotage their businesses.
Arch-Enemy: Lion is written as Petra's, since the game starts with bad blood between them, and they eventually conclude that they'll face each other again near the end of the game.
Rich Bitch: Dee is one of these. When Petra asks for Dee's help in getting her out of prison and it is revealed that Dee has a belt that grants one wish a day, Dee refuses to "waste" one of her wishes on Petra. She eventually uses this wish anyway to turn Petra mute out of spite.
Fantastic Racism: He informs Petra that he protests against talking animals not being accepted into universities and generally being treated poorly. Sounds familiar?
Gung Holier Than Thou: Jinjur comes across as this at times, especially when she rigidly stands up for the guard and its authority—especially considering her disdain for Petra's abandonment of her post.
Nick Chopper/The Tin Man
The Alcoholic: Seemingly played straight, since the Tin Man is portrayed as an alcoholic who constantly drinks due to his breakup with Nimee Amee, his inability to defeat Frogman, and his ineffectiveness as the Winkie governor. Played with, though, when you realize that the Tin Man can't possibly get drunk from drinking crude oil all day.
Stoic Woobie: Nick's clearly affected by his breakup with Nimee Amee, and he’s disappointed that he can't do much to help the corruption in Flow, but he sure doesn't seem like he cares, since he stands around drinking all day.
Stopped Caring: In regards to being the governor. Nick knows that since Frogman essentially runs half of Flow, he can't create change until he takes the Frogman down, which is near impossible to do.
Loan Shark: The profits that Frogman makes are primarily from loaning the residents of Flow funds to help their businesses, then threatening to sabotage them if they can't pay up.
Narcissist: Judging from his room-sized painting of himself, Frogman seems to be very self-absorbed. Though the painting does double as a Portal Picture.
Sassy Secretary: Nimee becomes one of these when the Tin Man rejects her, and she gets fed up with Frogman's unappreciative nature.