Mayor Kobayashi

Mayor Kobayashi is the main antagonist of Wes Anderson's 2018 stop-motion film Isle of Dogs. He is the corrupt mayor of Magasaki City who wants to exterminate every dog.

He is voiced by Kunichi Nomura.

Role
Kobayashi signs a decree banishing all dogs to Trash Island, despite the scientist Professor Watanabe insisting he is close to finding a cure. The first dog to be banished is Spots, who belonged to Atari Kobayashi, the orphaned nephew and ward of the mayor.

Six months later, Atari runs away from home, steals a plane and flies to Trash Island to find Spots. Crash-landing, he is rescued by dogs Rex, King, Duke, Boss, and Chief. They decide to help Atari locate Spots, although Chief, a former stray, is reluctant to fraternize with humans. Initially believing he died months ago after his cage failed to open upon arrival, the dogs soon learn there was a mixup and Spots may be alive elsewhere on the island. After a skirmish with a rescue team sent by Kobayashi to retrieve Atari, and the insistence of a female purebred named Nutmeg, Chief has a change of heart and decides to accompany Atari and company on their search.

Meanwhile, Professor Watanabe finds a cure, but is poisoned by Kobayashi so the dogs can remain on the island. Foreign exchange student Tracy Walker suspects a conspiracy and begins to investigate. She confronts assistant scientist Yoko Ono, a former cohort of Watanabe, who confirms Tracy's suspicions and gives her the last remaining dose of the cure.

Atari and the dog tribe decide to return to Megasaki City to attempt to prevent Kobayashi to exterminate all the dogs on Trash Island. At Kobayashi's election ceremony, he prepares to give the order, but Tracy presents her evidence of his corruption and the cure's existence. Atari and the dogs also arrive and confirm the cure works. Kobayashi has a change of heart, but his right-hand man insists upon seeing exterminates through. A fight ensues in which the button is pressed, but the poison backfires on the captors instead, thanks to a friend of Tracy's, allowing them to escape. During the fight, Atari and Spots are gravely injured. Atari's only remaining kidney fails, but Kobayashi, admitting his mistakes, donates his own to save the boy. By election law, mayorship of the city falls to Atari, and he decrees that dogs be allowed to reintegrate into society. Spots recovers from his injuries and raises his children under the Kobayashi Manor, Tracy and Atari become a couple, while Chief reunites with Nutmeg and takes up the role of bodyguard for Atari.