In which TV series is J.R. Ewing a main character?

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