Ralph George Macchio (born November 4, 1961) is an American actor, best known for his roles as Daniel LaRusso in the Karate Kid series, Billy Gambini in My Cousin Vinny, and Johnny Cade in The Outsiders. He is also known to American television audiences for his season five recurring role as Jeremy Andretti on the comedy-drama Eight Is Enough. He competed on the twelfth season of Dancing with the Stars. Description above from the Wikipedia article Ralph Macchio, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Ralph Macchio plays as Daniel LaRusso in Cobra Kai.
Ralph Macchio is the top #1 member of the cast and appears in 30 episodes.

​From Wikipedia, the free encyclopedia.   William Michael "Billy" Zabka (born October 20, 1965) is an American actor, martial artist, screenwriter, and film producer. Zabka is best known for playing bully types in several popular '80s films, such as his role of Johnny Lawrence in 1984's The Karate Kid. Description above from the Wikipedia article William Zabka, licensed under CC-BY-SA, full list of contributors on Wikipedia.

William Zabka plays as Johnny Lawrence in Cobra Kai.
William Zabka is the top #2 member of the cast and appears in 30 episodes.

Courtney Henggeler (born December 11, 1981) is an American actress.

Courtney Henggeler plays as Amanda LaRusso in Cobra Kai.
Courtney Henggeler is the top #3 member of the cast and appears in 30 episodes.

Xolo Maridueña was born in Los Angeles, California on June 9, 2001, Maridueña was barely three days old when he got his first taste of behind-the-scenes action in a radio station studio. Xolo has grown up watching artists perform firsthand, which sparked his intense interest in becoming a performer in his own right.

Xolo Mariduena plays as Miguel Diaz in Cobra Kai.
Xolo Mariduena is the top #4 member of the cast and appears in 30 episodes.

Tanner Buchanan is an actor, known for Designated Survivor (2016), The Fosters (2013) and Grey's Anatomy (2005).

Tanner Buchanan plays as Robby Keene in Cobra Kai.
Tanner Buchanan is the top #5 member of the cast and appears in 30 episodes.

Mary Mouser plays as Samantha LaRusso in Cobra Kai.
Mary Mouser is the top #6 member of the cast and appears in 30 episodes.

Actor best known for his role as Kirby Buckets on the Disney XD series Kirby Buckets.

Jacob Bertrand plays as Eli "Hawk" Moskowitz in Cobra Kai.
Jacob Bertrand is the top #7 member of the cast and appears in 20 episodes.

Gianni Decenzo plays as Demetri in Cobra Kai.
Gianni Decenzo is the top #8 member of the cast and appears in 20 episodes.

An American actor who has appeared in both feature films and television series. Description above from the Wikipedia article Martin Kove, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Martin Kove plays as John Kreese in Cobra Kai.
Martin Kove is the top #9 member of the cast and appears in 20 episodes.