In which TV series is Louie De Palma a main character?

Who played Mork in 'Mork & Mindy'? Who played Latka Gravas in 'Taxi'? In which TV series is Latka Gravas a main character? Who played Louie De Palma in 'Taxi'? Who played J.R. Ewing in 'Dallas'? In which TV series is J.R. Ewing a main character? Who played Bo Duke in 'The Dukes of Hazzard'? In which TV series is Bo Duke a main character?