Johnny Rico is a fictional character from the science fiction novel "Starship Troopers," written by Robert A. Heinlein. He serves as the protagonist and narrator, detailing his experiences in the Mobile Infantry, a futuristic military unit. The story explores themes of citizenship, duty, and the morality of war as Rico rises through the ranks. In the narrative, Rico faces various challenges, including combat against alien species known as the Arachnids. His journey reflects the struggles of growing up and understanding the responsibilities that come with adulthood, as well as the sacrifices made for the greater good of society.