Lake Siegel Bell is an American actress, director, and screenwriter. She has starred in various television series, including Boston Legal, Surface, How to Make It in America and Children's Hospital Wikipedia

Lake Bell plays as Poison Ivy (voice) in Harley Quinn.
Lake Bell is the top #1 member of the cast and appears in 26 episodes.

Alan Wray Tudyk ( born March 16, 1971) is an American actor. His film work includes roles in 28 Days (2000), A Knight's Tale (2001), Dodgeball: A True Underdog Story (2004), voice and motion capture for Sonny in I, Robot (2004), and 3:10 to Yuma (2007). He starred in the black comedy horror film Tucker & Dale vs. Evil (2010). Tudyk has also appeared in the films, Transformers: Dark of the Moon (2011), 42 (2013), Maze Runner: The Scorch Trials (2015) and Trumbo (2015). He has voiced characters in every Walt Disney Animation Studios film since 2012.

Alan Tudyk plays as Optimus Prime (voice) in Harley Quinn.
Alan Tudyk is the top #2 member of the cast and appears in 22 episodes.

Jay Scott Greenspan, better known by his professional name of Jason Alexander, is an American actor, writer, comedian, television director and producer, and singer. He is best known for his role as George Costanza on the television series Seinfeld, appearing in the sitcom from 1989 to 1998. He also has had an active career on the stage, appearing in several Broadway musicals including Jerome Robbins' Broadway in 1989, for which he won the Tony Award as Best Actor in a Musical. He appeared in the Los Angeles production of The Producers with Martin Short. He is the Artistic Director of "Reprise! Broadway's Best in Los Angeles," where he has directed several musicals. Alexander is also an avid poker player.

Jason Alexander plays as Sy Borgman (voice) in Harley Quinn.
Jason Alexander is the top #3 member of the cast and appears in 13 episodes.

Ronald Kyle Funches (born March 12, 1983) is an American stand-up comedian, actor, and writer. He’s known for his roles in Trolls (2016), Trolls World Tour (2020), and the DC animated television series Harley Quinn (2019-)

Ron Funches plays as Howard in Harley Quinn.
Ron Funches is the top #4 member of the cast and appears in 10 episodes.

From Wikipedia, the free encyclopedia Jerry Brooks (born December 16, 1964), better known by his stage name J.B. Smoove, is an American actor, writer and stand-up comedian best known for his recurring role as Leon on Curb Your Enthusiasm.

J.B. Smoove plays as Marker in Harley Quinn.
J.B. Smoove is the top #5 member of the cast and appears in 8 episodes.

Kaley Cuoco is an American film and television actress and singer. She is best known for her roles as Bridget Hennessy on the sitcom 8 Simple Rules, Billie Jenkins on the supernatural drama Charmed, and Penny on the sitcom The Big Bang Theory.

Kaley Cuoco plays as Ava Bartlett in Harley Quinn.
Kaley Cuoco is the top #6 member of the cast and appears in 8 episodes.

Rahul Kohli was born on 13th November 1985 in London. Rahul began acting in school plays at an early age, but it wasn't until he was 17 that drama became his main focus. After leaving college having studied Film, Rahul applied for drama schools with the hope to begin his career as a performer. Having been accepted at school, Rahul began to learn his trade on stage, performing in various productions from William Shakespeare's Henry V to Eduardo De Filippo's Sabato, domenica e lunedi. After leaving the theatre and acquiring an agent, Rahul has been working on British television ever since, performing in well known British dramas such as Eastenders and Holby City, to working on worldwide advertising campaigns for Heineken and Sony. While screen acting has always been his primary focus, Rahul has still enjoyed success on stage in his professional career, with a stint at The National Theatre working with acclaimed director Howard Davies.

Rahul Kohli plays as Sunil Ranja in Harley Quinn.
Rahul Kohli is the top #7 member of the cast and appears in 4 episodes.