4 characters were on the show for all 11 seasons
Hawkeye Pierce
Father Mulcahy
Margaret "Hot Lips" Houlihan
Max Klinger (frequent character first 3 seasons, regular character from season 4 on)
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Four characters stayed for the entire 11 season show; Hawkeye, Father Mulcahy, Margaret and Klinger.
basically all the main mash characters like hotlips,hawkeye,radar
An entire episode centred around the fictitious character of Captain Tuttle.
Wayne Rogers starred in MASH for three seasons.
Larry Gelbart did not play any characters on MASH.He was a writer and sometime director of the show.