Adoon

 was a young pickpocket in 9th century Baghdad. When the Cat-People arrived, he thought they were sand demons. The Second Doctor befriended him, and after stealing the power pack from Lotuss' gun, he had Adoon plant it on Thorsuun. The Cat-People thus believed that Thorsuun had betrayed them. The Doctor sent Adoon away to avoid further trouble. (PROSE: Invasion of the Cat-People)

Behind the scenes
Gary Russell assigned most of the characters in Invasion of the Cat-People with a real-world actor who represented his preference for who would play each part in an imaginary televised version of the novel. However, Adoon is one of the few characters not to be assigned one, the other being Jodi.