Yukio Hatoyama is a Japanese politician who formerly served as the prime minister of Japan. He appeared in Season Thirteen episode "Whale Whores".
During a news report on the killings of dolphins and whales by the Japanese, the prime minister responds to the killings by yelling "Fucka you whale! And fucka you dolphins!", as he raises both of his middle fingers.
Stan Marsh, who was on a mission to stop the Japanese, was eventually captured along with Eric Cartman and Kenny McCormick. After discovering that the true reason behind the killings through a photo of dolphins and whales on board Enola Gay, Stan devised a plan to alter the photo to show a chicken and a cow on board and presented it to Emperor Akihito and the Japanese officials at the prime minister's office. In response, the prime minister became enraged at the supposed "scapegoating", slamming his desk in anger.
Yukio Hatoyama wears a dark brown suit over a white shirt and blue striped tie.