Ken Watanabe as Ishiro Serizawa
Age: 71
Nationality: Japanese
Personality: admires all Titans, empathy for co-workers and friends, very wise leader of Monarch.
Relationships: Ren Serizawa(Son), Dr Vivienne Graham(daughter-figure)

Sally Hawkins as Vivienne Graham
Age: 43
Nationality: British
Personality: Kind, good friend, eager to learn.
Relationships: Ishiro Serizawa(Mentor, father-figure)

Kyle Chandler as Mark Russell
Age: 55
Nationality: American
Personality: fascination with animals, loving father, wants daughter safe
Relationships: Madison Russell(Daughter), Emma Russell(Ex-Wife)

Vera Farmiga as Emma Russell
Age: 46
Nationality: American
Personality: Dedicated to work, passionate about wellbeing, dedicated mother, desire to right wrongs.
Relationships: Madison Russel(Daughter), Mark Russell(Ex-husband)

Millie Bobby Brown as Madison Russell 
Age: 17
Nationality: American
Personality: Academically gifted, loves the Titans, sense of humor, cares for friends
Relationships: Mark Russell(Father), Emma Russell(Mother), Michael Bishop(Boyfriend)

Bradley Whitford as Rick Stanton
Age: 60
Nationality: American
Personality: laid-back, sarcastic, serious when things are grim

Thomas Middleditch as Sam Coleman
Age: 37
Nationality: Canadian
Personality: good with technology, compassionate, takes safety for colleagues top priority, a little awkward and nervous

Zhang Ziyi as Ilene/Ling Chen
Ages: 38
Nationalities: Chinese
Personalities: Spiritual, intelligent, passionate, empathy for Titans
Relationships: Ling/Ilene(Twin Sisters), Ren Serizawa(Ilene's love interest)

Aaron Taylor Johnson as Ford Brody
Age: 30
Nationality: American
Personality: Level-headed, determined to protect, survivor of 2014 San Francisco battle, cares for comrads
Relationships: Elle Brody(Wife), Sam Brody(Son), Joe Brody(Father), Sandra Brody(Mother)

Aisha Hinds as Colonel Foster
Age: 45
Nationality: American
Personality: Decorated war hero, battle-hardened, tactical leader

O'Shea Jackson Jr as Jackson Barnes 
Age: 30
Nationality: American
Monster fan, tough soldier, second in command of G-Team, takes job seriously

Anthony Ramos as Anthony Martinez
Age: 29
Nationality: American
Personality: incredibly selfless, tests his skills, helps others more than his jobs

Elizabeth Ludlow as Lauren Griffin 
Age: 31
Nationality: American
Personality: confident, brave, always expecting worst case scenarios

Tom Hardy as John Conrad
Age: 43
Nationality: British/American
Personality: Academic interest in Titans, serious with job, expert in enviroment.
Relationships: Maria Conrad(Sister), James Conrad(Father), Mason Weaver(Mother)

Kiera Knightly as Maria Conrad
Age: 39
Nationality: British/American
Personality: likes helping, less serious than her brother, caring for Titans, empathic for living things
Relationships: John Conrad(Brother), James Conrad(Father), Mason Weaver(Mother)

Joe Morton as Houston Brooks
Age: 71
Nationality: American
Personality: cares for nature, loving father, calm under pressure
Relationships: San Lin(Wife), Aaron Brooks(son)

Don Cheadle as Aaron Brooks
Age: 41
Nationality: Afro-Asian American
Personality: Sympathetic, friendly, caring for others, eager to learn about Titans.
Relationships: Aaron Brooks(Father), San Lin(Mother)

David Straithairn as Admiral Stenz 
Age: 73
Nationality: American
Personality: Skeptical of Titans, no nonsense, serious, strategic, close and narrow minded, dedicated to military service

Shun Oguri as Ren Serizawa
Age: 38
Nationality: Japanese
Personality: Empathic for Titans like his father, care for others, open to ideas, leader skills, trust in nature.
Relationships: Ishiro Serizawa(Father), Vivienne Graham(Sister figure), Ilene Chen(Love Interest)