Brenton Thwaites is an Australian actor, best known for portraying Dick Grayson / Robin on Titans, Luke Gallagher on the Fox8 teen drama series, SLiDE, and Stu Henderson on the soap opera Home and Away. He starred as Jonas in The Giver, opposite Jeff Bridges and Meryl Streep, as Prince Phillip in Maleficent, and as Bek in God's of Egypt.

Brenton Thwaites plays as Dick Grayson, Robin, Nightwing in Titans.
Brenton Thwaites is the top #1 member of the cast and appears in 43 episodes.

Teagan Croft plays as Rachel Roth, Raven in Titans.
Teagan Croft is the top #2 member of the cast and appears in 43 episodes.

Mame-Anna Diop (born February 6, 1988), known professionally as Anna Diop, is a Senegalese-American actress and model. She stars as the DC Comics superheroine Starfire on the HBO Max series Titans since 2018. Diop was also a series regular on The CW supernatural mystery The Messengers (2015) and the thriller 24: Legacy (2017), along with appearing in the horror film Us (2019). Description above from the Wikipedia article Anna Diop, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Anna Diop plays as Koriand'r, Kory Anders, Starfire in Titans.
Anna Diop is the top #3 member of the cast and appears in 43 episodes.

Joshua Orpin (born April 15, 1994) is an Australian actor. He portrays Conner Kent/Superboy in the second season of Titans.

Joshua Orpin plays as Subject 13, Conner Kent, Superboy in Titans.
Joshua Orpin is the top #4 member of the cast and appears in 32 episodes.

Curran Walters plays as Jason Todd, Robin, Red Hood in Titans.
Curran Walters is the top #5 member of the cast and appears in 26 episodes.

Following her graduation from high school as a junior, American actress Conor Leslie began landing guest spots on television shows before securing her first major role in the 2012 film Chained as the potential first victim of a serial killer's protégé. Leslie has since primarily focused on the small screen, most prominently portraying courtesan Sabine in Discovery's historical adventure Klondike (2014), spaceship computer Natasha in Yahoo!'s sci-fi comedy Other Space (2015), and political aide Sarah Ellis in Fox's drama Shots Fired. She also appeared as the half-sister of protagonist Juliana Crane in the first three seasons of the Amazon series The Man in the High Castle from 2015 to 2018. In 2018, Leslie gained new recognition for being the first to play DC superheroine Donna Troy in live-action on the DC Universe original Titans and returned to the series for 2019's second season.

Conor Leslie plays as Donna Troy, Wonder Girl in Titans.
Conor Leslie is the top #6 member of the cast and appears in 26 episodes.

Minka Dumont Kelly is an American actress. She starred in the NBC series Friday Night Lights as Lyla Garrity from 2006 to 2009.

Minka Kelly plays as Dawn Granger, Dove in Titans.
Minka Kelly is the top #7 member of the cast and appears in 13 episodes.

Esai Morales (born October 1, 1962) is an American actor known for his role as Bob Valenzuela in La Bamba. He also appeared in American Family and on Resurrection Blvd. In television, he would perhaps be best known for his roles on NYPD Blue and Caprica.

Esai Morales plays as Slade Wilson, Deathstroke in Titans.
Esai Morales is the top #8 member of the cast and appears in 13 episodes.

Chelsea Zhang is an American film and television actress and former competitive (junior) figure skater. She's a graduate of the University of Southern California, USA.

Chelsea Zhang plays as Rose Wilson, Ravager in Titans.
Chelsea Zhang is the top #9 member of the cast and appears in 13 episodes.

Vincent Paul Kartheiser (born May 5, 1979) is an American actor known for playing Connor on Angel and Pete Campbell on Mad Men.

Vincent Kartheiser plays as Dr. Jonathan Crane, Scarecrow in Titans.
Vincent Kartheiser is the top #10 member of the cast and appears in 13 episodes.