PAX PROBLISCUM: In a last ditch effort to salvage diplomatic proceedings, you invoke the ultimate resolution in your formal attache of plenipotentiary clauses, motioning for bilateral demilitarization and cessation of hostilities for the mutual advancement and prolonged commitment to the furtherance of harmonious relations among sovereign parties. PEACE BE WITH YOU.
Guile Hero: Pulchritude is his highest stat (as unconventionally as it ends up getting used).
Hardboiled Detective: Though none of them are quite as hardboiled as they'd like to think they are, he comes the closest to playing this straight. Fitting, for someone who specializes in pulchritude.
Jack of All Stats: Hussie specifically describes him as an analogue to Mario in Mario Kart and Ryu in Street Fighter. In fact he's the only one who receives boosts in both of his non-specialized ones when he levels up. For comparison, AD's pulchritude and PI's vim bars actually shrank. In fact, PI lost his vim gauge entirely.
Me's a Crowd: Every particle (or, rather, Part-Pickle) in the universe is in fact a tiny Pickle Inspector.
Mr. Imagination: He's much better at it than even Problem Sleuth, to the point where one of his imaginary selves ascends to godhood.
Neutral No Longer: Subverted with Godhead Pickle Inspector. When the fabric of the universe is ripped in half, it looks like he's going to act to help our heroes... Except all he does is just sew it back together, and go about minding his own business.
A giant, red Ace Dick with superhuman strength and durability, born from drinking distilled hot sauce.
Captain Ethnic: Subverted. He starts out with a poncho and sombrero but quickly changes back into his normal clothes, aware that "this silly ethnic shit is probably going to get really old really fast."
Eventually begins to Enforce the trope by making others intimidated whenever they intend to bring up his ethnicity.
Gravity Master: Once he obtains the Gravity Brassiere, he becomes capable of altering his density and transforming into a black hole.
Mobile Menace: MK is a pretty active villain. When the story starts, he's trapped the heroes in their building, trapped their female alter egos in a dollhouse, and escaped from his own office on the Chicago Overcoat. He then goes on to complete his own Quest of Spirit, although we don't see it.
A team of ne'er-do-well jazz musicians, consisting of ringleader Spades Slick, master planner Diamonds Droog, brawny safecracker Hearts Boxcars, and ClubsDeuce. They first appeared in the non-canon Problem Sleuth donation comics, and later went on to play an important role in Homestuck.
Breakout Character: All of them qualify, but Slick is the most dramatic example — he went from being a noncanonical enemy in a handful of Problem Sleuth donation comics to (an alternate version of) a multiverse-spanning nigh-omnipotent threat in Homestuck.