Sylvester Asimov is a major supporting character in the anime and manga series Terra Formars. He is a Russian officer and the leader of the Russian team on the Annex I mission to Mars. Known for his immense physical strength, discipline, and strict demeanor, Asimov is a genetically modified human with traits of the Tasmanian King Crab. He often acts as a mentor and father figure to his teammates, especially to his daughter, Elena, and plays a crucial role in the fight against the Terraformars.