Mayor Humdinger is the mayor of Foggy Bottom and the main antagonist of the PAW Patrol franchise, serving as the overarching antagonist of the first season and the main antagonist of Season 2 onwards and PAW Patrol: The Movie. He is the arch-nemesis of the PAW Patrol, the leader and boss of the Kitten Catastrophe Crew, and the arch-rival of Mayor Goodway and Ryder.
Mayor Humdinger can be grumpy at times, seen when he lost in "Pup Pup and Away" and Mayor Goodway / Adventure Bay won. He argues a lot with Adventure Bay's mayor and he will do anything to be "on top".
Mayor Humdinger is rather conceited, thinking his town is better than Adventure Bay in every way possible. In Season 1, while antagonistic towards Mayor Goodway, he mostly played fairly due in part to confidence in his record of winning and generally being undefeated in most of the competitions he participated in, only to end up losing to Mayor Goodway and the PAW Patrol.
As of Season 2, he usually cheats in order to win, showing a lack of morality and "win-at-all-costs" personality. He is also the assembler of the Kitten Catastrophe Crew, a group of mischievous cats who perform heinous deeds to support his efforts. He also became slightly more villainous in Season 2 (whereas in Season 1, he was simply antagonistic) to the point he and the Kitten Catastrophe Crew have their own secret lair and he behaves more like a stereotypical villain, such as laughing maniacally and even covertly observing the PAW Patrol through a video monitor ("Pup-Fu!"). He is also shown to be willing to resorting to stealing something he wants, such as Wild Wilbur's hidden treasure ("Pups Save an Outlaw's Loot") and Farmer Yumi's priceless Martial Arts scroll ("Pup-Fu!"). He is also shown to be quite greedy in "Pups Save an Outlaw's Loot". However, his plans can occasionally backfire due to his own overconfidence and lack of forethought, resulting in him needing to be rescued by the PAW Patrol.
In "Pups Save a Snowboard Competition", he is shown to care about Cat Rubble and Cat Chase when they are in danger of falling off a cliff as he is shown nervously biting his fingernails, though he returns to his usual self once they are safe and reluctantly thanks Ryder and the PAW Patrol due to his pride, but ends up thanking them albeit begrudgingly.
In "Pups Save Friendship Day", his competitiveness is so great that he is willing to turn a holiday about friendship into a contest between Foggy Bottom and Adventure Bay. He is also shown to be slightly narcissistic as he called a Friendship Day Cake that resembled him the most beautiful thing he had ever seen. He was also touched by Mayor Goodway's attempt to help him when he was being carried away by his balloon bouquet and promised to try to be a little nicer. However, his later appearances show that this did not take since he continues to be villainous.
He is a rather poor judge of character. He trusts his nephew Harold, even though the latter often betrays him.
From "Pups Save a Soapbox Derby", we learned something about his personal hygiene. Humdinger only washes twice a month.
He is stubborn and often doesn't know when to quit. In "Dino Rescue: Pups and the Lost Dino Eggs", he refused to return a young T-Rex to its enraged mother, even when the latter was chasing him.
Although Humdinger doesn’t like the PAW Patrol pups, he has shown a general dislike for dogs in general, because he's a cat person. This is particularly evident in PAW Patrol: The Movie, where as a plot point, after becoming Adventure City's mayor, Humdinger wastes no time in banning dogs from pretty much every location within the metropolis, having no regard for it's citizens. Despite being enemies, Ryder still takes pleasure in rescuing the mayor from disaster. The film also showcases Humdinger’s lack of moral or practical ethics, as he was willing to threaten a shutdown to a university for the cloud catcher and he was willing to abuse subordinates, citizens and technology for his own goals, refusing to take responsibility for his mishaps. Humdinger's ego also makes him less willing to abandon his ideals unless they horrendously backfire on him, and as seen in numerous episodes he often tries illicit methods to get what he wants, due to both his lack of patience and his inflated sense of self-importance.
Mayor Humdinger has dark brown eyes, light peachy skin, and blonde hair that is bald on the top of his head with sideburns. He also has a big bushy blonde curled mustache. He wears a blue dress jacket with pockets on the waist over a white dress shirt, purple dress pants, brown loafers, and a blue top hat. His standard outfit resembles Rich Uncle Pennybags (the Monopoly man).
He also looks similar to the statue of Mayor Goodway's Grover Goodway.
His swimming attire is a one-piece bathing suit with purple and yellow stripes.