George "Hobo" Kostinen was a child living in Ogmore-by-Sea.
When Lucy Wilson joined his school after moving from London, Hobo made friends with her very quickly, with both of them being outsiders. The two of them travelled to London to an event celebrating the life of Alistair Gordon Lethbridge-Stewart. The event was a trap by the Great Intelligence. Hobo was able to help Lucy defeat the entity alongside Dame Anne Bishop. (PROSE: Avatars of the Intelligence)
Lucy and Hobo travelled to Monknash to investigate the strange behaviour of its inhabitants. They discovered the behaviour was caused by the influence of Cylene, an alien matriarch. After stopping Cylene's sister, Sorene, from stranding her on the planet, Cylene was able to return home. (PROSE: The Midnight People)
James Lethbridge-Stewart had memories of meeting Lucy and Hobo in Bledoe when he and Alistair were children. He recalled that Hobo possessed more knowledge about them than was possible. (PROSE: Night of the Intelligence)
According to one account, Hobo and Lucy eventually ended up as the last two rebellious survivors of humanity in a ruined London at "the end of the world", who were being hunted by the government while the Sun slowly imploded overhead. (PROSE: Assessment Day)