He is an actor, known for A Dog's Purpose (2017), Riverdale (2017) and Shortland Street (1992).

K.J. Apa plays as Archie Andrews in Riverdale.
K.J. Apa is the top #1 member of the cast and appears in 79 episodes.

Lili Reinhart is an American actress and singer, known for portraying Betty Cooper on The CW television series Riverdale.

Lili Reinhart plays as Elizabeth "Betty" Cooper in Riverdale.
Lili Reinhart is the top #2 member of the cast and appears in 79 episodes.

Cole Sprouse is an Italian-born American actor, collectively known as the Sprouse Bros with his twin brother Dylan Sprouse. By the end of the 2000s, MSN reported the twin brothers became the richest teenage twins in the world.

Cole Sprouse plays as Jughead Jones in Riverdale.
Cole Sprouse is the top #3 member of the cast and appears in 79 episodes.

Camila Carraro Mendes is an American actress and singer, known for portraying Veronica Lodge on The CW teen drama television series Riverdale. She made her feature film debut portraying the character, Morgan in The New Romantic, which premiered at the SXSW Festival in March 2018. In the same month, Mendes joined the cast of the romantic comedy The Perfect Date alongside Laura Marano and Matt Walsh. Mendes was born in Charlottesville, Virginia, to Brazilian parents, Victor Mendes and Gisele Carraro. Her mother is from Porto Alegre, Rio Grande do Sul, while her father is from Brasília. She moved 16 times growing up but spent most of her childhood in Florida, where she attended American Heritage School, in Plantation. At the age of 10, she lived in Brazil for a year. In May 2016, Mendes graduated from New York University Tisch School of the Arts, alongside her Riverdale co-star Cole Sprouse. At NYU, she also became friends with singer Maggie Rogers. In 2018, Mendes appeared in the music video for Rogers' song "Give a Little". Description above from the Wikipedia article Camila Mendes, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Camila Mendes plays as Veronica Lodge in Riverdale.
Camila Mendes is the top #4 member of the cast and appears in 79 episodes.

Madelaine Petsch is an actress, known for Riverdale, The Curse of Sleeping Beauty and The Hive.

Madelaine Petsch plays as Cheryl Blossom in Riverdale.
Madelaine Petsch is the top #5 member of the cast and appears in 79 episodes.

Luke Perry (born Coy Luther Perry III; October 11, 1966 – March 4, 2019) was an American actor. Perry starred as Dylan McKay on the TV series Beverly Hills, 90210, a role he played from 1990–95, and then from 1998–2000. Much publicity was garnered over the fact that even though he was playing a sixteen-year-old when 90210 began, Perry was actually in his mid twenties at that time. Perry returned to 90210 in 1998 (this time billed as a permanent "Special Guest Star") and remained with the series until its conclusion in 2000. Perry died at the age of 52 from complications following a massive stroke.

Luke Perry plays as Fred Andrews in Riverdale.
Luke Perry is the top #6 member of the cast and appears in 57 episodes.

Vanessa Morgan (born March 23, 1992) is a Canadian actress.

Vanessa Morgan plays as Toni Topaz in Riverdale.
Vanessa Morgan is the top #7 member of the cast and appears in 44 episodes.

Charles Melton plays as Reggie Mantle in Riverdale.
Charles Melton is the top #8 member of the cast and appears in 44 episodes.

Mark Andrew Consuelos (born March 30, 1971) is a Spanish-born American television and film actor. Description above from the Wikipedia article Mark Consuelos, licensed under CC-BY-SA, full list of contributors on Wikipedia.                    

Mark Consuelos plays as Hiram Lodge in Riverdale.
Mark Consuelos is the top #9 member of the cast and appears in 44 episodes.

Bryan Ray Trout (born January 20, 1970), best known as Skeet Ulrich, is an American actor best known for starring in the CBS drama Jericho as Jake Green and for portraying Billy Loomis in Scream. He starred in the police and courtroom drama Law & Order: LA for eleven episodes before being let go due to a creative overhaul. Description above from the Wikipedia article Skeet Ulrich, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Skeet Ulrich plays as Forsythe Pendleton "FP" Jones in Riverdale.
Skeet Ulrich is the top #10 member of the cast and appears in 41 episodes.