Yuri Petrov is a complex character in the anime series 'Tiger & Bunny'. He serves as the stern and justice-driven judge of Stern Bild City's Supreme Court. However, he leads a double life as the vigilante 'Lunatic', who acts outside the law to punish criminals he deems have not received adequate justice. His actions and motivations are deeply rooted in his past trauma and a strong belief in a personal sense of justice, making him one of the series' most intriguing and morally ambiguous figures.