Thomas Grant Gustin (born January 14, 1990) is an American actor and singer. He is best known for his roles as Barry Allen / The Flash on the CW series The Flash as part of the Arrowverse television franchise, and for his role as Sebastian Smythe on the Fox series Glee. Description above from the Wikipedia article Grant Gustin, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Grant Gustin plays as Barry Allen, The Flash in The Flash.
Grant Gustin is the top #1 member of the cast and appears in 172 episodes.

Danielle Nicole Panabaker (born September 19, 1987) is an American actress. She began acting as a teenager and came to prominence for her roles in the Disney films Stuck in the Suburbs (2004), Sky High (2005) and Read It and Weep (2006), and in the HBO miniseries Empire Falls (2005). She won three Young Artist Awards: for guest-starring in an episode of the legal drama television series The Guardian (2004), for her lead role in the TV film Searching for David's Heart (2005) and for her ensemble performance in the family comedy film Yours, Mine & Ours (2005). Panabaker came to wider attention as a cast member in the CBS legal drama series Shark (2006–2008) and is also noted as a scream queen, having starred in the psychological thriller Mr. Brooks (2007) and the horror films Friday the 13th (2009), The Crazies (2010), John Carpenter's The Ward (2010) and Piranha 3DD (2012). After starring in recurring roles on Necessary Roughness (2011–2013), Bones (2012–2013) and Justified (2014), Panabaker guest-starred as Caitlin Snow on The CW television series Arrow in April 2014. The character was then spun off into the main cast of The Flash which premiered that October. Starting with the series' second season, Panabaker began playing the character's alter ego Killer Frost in different capacities, in conjunction with her role as Snow, leading to subsequent guest appearances on Arrow, Supergirl and Legends of Tomorrow. For her role on The Flash as Frost, Panabaker has been nominated for five Teen Choice Awards and won the 2021 Saturn Award for Best Supporting Actress on Television.

Danielle Panabaker plays as Caitlin Snow, Killer Frost, Frost in The Flash.
Danielle Panabaker is the top #2 member of the cast and appears in 172 episodes.

Raised in Plano, Texas, Candice continued her childhood dream of becoming an actress by attending Southern Methodist University in Dallas where she graduated Summa Cum Laude with a B.F.A in Theatre. It was here that she was scouted by The Young and the Restless for a CBS Soap Star Contest and flew out to Los Angeles to briefly join the cast. Candice finished her college education at SMU and moved to Los Angeles shortly after.

Candice Patton plays as Iris West-Allen in The Flash.
Candice Patton is the top #3 member of the cast and appears in 172 episodes.

Jesse Lamont Martin (né Watkins; January 18, 1969) is an American actor and singer. He originated the role of Tom Collins on Broadway in the musical Rent and performed on television as NYPD Detective Ed Green on Law & Order and Captain Joe West on The Flash.

Jesse L. Martin plays as Joe West in The Flash.
Jesse L. Martin is the top #4 member of the cast and appears in 171 episodes.

Carlos David Valdes (born April 20, 1989) is a Colombian-American actor and singer. He is best-known for his role as Cisco Ramon / Vibe on The CW television series The Flash and other Arrowverse-related shows.

Carlos Valdes plays as Cisco Ramon, Vibe, Mecha-Vibe in The Flash.
Carlos Valdes is the top #5 member of the cast and appears in 133 episodes.

Thomas Cavanagh is a Canadian film and television actor. He was born on October 26th, 1963 in Ottawa, Ontario, the second-oldest of five children. His close-knit family moved to Ghana, West Africa when Tom was six. His father educated teachers there. The family moved back to Canada before Tom started high school (which he attended in southern Quebec). Tom went to Queens University in Kingston, Ontario where he played on the basketball team and graduated with degrees in English, Biology, and Education. His interest in theater grew when he was cast as the lead Danny Zuko in a Canadian "Grease". In his spare time he likes to play guitar and participate in a variety of sports.

Tom Cavanagh plays as Harrison 'H.R.' Wells, Harrison 'Harry' Wells, Harrison Wells, Eobard Thawne, Reverse-Flash, Harrison 'Nash' Wells, Pariah, Harrison 'Sherloque' Wells in The Flash.
Tom Cavanagh is the top #6 member of the cast and appears in 133 episodes.

Danielle Nicolet (born November 24, 1973) is an American television and film actress.

Danielle Nicolet plays as Cecile Horton in The Flash.
Danielle Nicolet is the top #7 member of the cast and appears in 80 episodes.

Hartley Sawyer plays as Ralph Dibny, Elongated Man in The Flash.
Hartley Sawyer is the top #8 member of the cast and appears in 41 episodes.

Kayla Compton moved to Los Angeles to pursue her longtime dream of acting and singing. She quickly had success and played Monica on the HBO hit, "Entourage." She also appeared on TNT's "Perception." In KING'S FAITH, she plays Natalie, the popular high school cheerleader with a past she is trying to hide. Raised in Jacksonville, Florida, Kayla has wanted to be a performer since she was a young girl. Singing was her main passion until her drama teacher in high school told her she should really look into acting, a craft she quickly fell in love with.

Kayla Compton plays as Allegra Garcia in The Flash.
Kayla Compton is the top #9 member of the cast and appears in 39 episodes.

Brandon McKnight plays as Chester P. Runk in The Flash.
Brandon McKnight is the top #10 member of the cast and appears in 39 episodes.