Tuong Lu Kim, also known as the City Wok Guy (voiced by Trey Parker), is a stereotypical Chinese character. He is prone to mispronouncing the word "city" as "shitty", and pronouncing Rs instead of Ls.
Lu Kim first appeared in the episode "Jared Has Aides", though his name was not given until "Child Abduction Is Not Funny". According to the DVD commentary on "Jared Has Aides", Tuong is based on an actual person. While doing sound mixing on their film Orgazmo, Parker and Matt Stone would phone a real life City Wok just to hear the man's voice.
Lu Kim's main job is the owner of City Wok, a Chinese take out service. He also operates the airline service City Airlines. Keeping with Chinese stereotypes, Tuong is an expert at building walls, and displays anti-Mongolian and anti-Japanese sentiments. In the episode "Wing", he appears as the husband of the titular character, a Chinese-New Zealand singer guest starring as herself.
Lu Kim's actual identity, Dr. Janus, appears in the episode "City Sushi". In the episode's two plotlines, Dr. Janus falsely diagnoses Butters with multiple personality disorder before being revealed to suffer from the disorder himself, while Lu Kim plots to murder his new Japanese rival Junichi Takayama. In a twist, Dr. Janus and Kim are revealed to be one and the same. Although Kim's actual identity is revealed to the people of South Park (leading Takayama to commit suicide in disgrace), the police decide not to help him with his condition, so that the town will still have an Asian restaurant. Lu Kim thus remains oblivious about his true self. Dr. Janus is likely to be named after Janus, the Roman god of beginnings and transitions, who is usually depicted with two heads facing opposite directions.
Read more about this topic: List Of Recurring South Park Characters