If you are trying to match the faces to the Pearson family, the key actors in tv show this is us are Mandy Moore and Milo Ventimiglia as Rebecca and Jack, with Sterling K. Brown, Chrissy Metz, and Justin Hartley as the adult Big Three. The show also uses younger actors for Randall, Kate, and Kevin, so the same character can appear at different ages in the same episode.
Main actors in This Is Us
The adult cast carries the present-day Pearson story, while the flashbacks explain why each character reacts the way they do. If you are checking the cast while rewatching, start with these names first because they anchor most of the family drama.
Mandy Moore as Rebecca Pearson
Mandy Moore plays Rebecca Pearson, Jack's wife and the mother of Randall, Kate, and Kevin. Her role is unusually demanding because Rebecca appears as a young woman, a mother of young children, a widow, and an older parent facing memory loss.
Milo Ventimiglia as Jack Pearson
Milo Ventimiglia plays Jack Pearson, the father whose presence is felt even when the story moves years beyond his death. Jack is remembered as devoted and heroic, but the show also gives him trauma, addiction struggles, and moments of weakness, which keeps him from becoming too polished.
Sterling K. Brown as Randall Pearson
Sterling K. Brown plays Randall Pearson, Jack and Rebecca's adopted son. Randall is brilliant, loving, and responsible, but he also carries anxiety and a lifelong need to understand where he belongs.
- Family role: The careful son who often tries to hold everyone together.
- Main emotional thread: Adoption, race, identity, and pressure.
- Best viewing clue: Watch how often Randall tries to solve feelings by taking control.
Chrissy Metz as Kate Pearson
Chrissy Metz plays Kate Pearson, whose story is deeply tied to grief, body image, music, motherhood, and her bond with Jack. Metz gives Kate humor and sharpness as well as vulnerability, so the character feels like more than a collection of struggles.
Justin Hartley as Kevin Pearson
Justin Hartley plays Kevin Pearson, the actor of the Big Three. Kevin can look like the most confident sibling at first, but his storyline gradually reveals addiction, loneliness, and a strong need to be taken seriously by the people he loves.
Susan Kelechi Watson as Beth Pearson
Susan Kelechi Watson plays Beth Pearson, Randall's wife. Beth often brings the clearest voice in the room: funny, direct, patient when she chooses to be, and unwilling to disappear inside Randall's emotional storms.
Chris Sullivan as Toby Damon
Chris Sullivan plays Toby Damon, Kate's partner and later husband. He begins as a source of humor and warmth, but his storyline becomes more complicated as the show explores depression, marriage strain, parenting, and the gap between loving someone and actually growing with them.
Jon Huertas as Miguel Rivas
Jon Huertas plays Miguel Rivas, Jack's best friend who later marries Rebecca. Miguel is easy to misjudge at first because viewers meet him in the shadow of Jack, but Huertas plays him with restraint rather than defensiveness.
Younger actors who play the Big Three
The younger cast is essential because This Is Us does not treat childhood scenes as simple flashbacks. Those scenes explain the adult versions of Randall, Kate, and Kevin: their fears, habits, rivalries, and attachments.
Lonnie Chavis as young Randall Pearson
Lonnie Chavis plays young Randall Pearson. His scenes show Randall as bright, observant, sensitive, and already aware that being adopted makes his place in the family feel different from Kevin and Kate's.
Chavis is especially good at making Randall look like a child who notices too much. That helps explain why adult Randall becomes caring and capable, but also anxious and overloaded.
Niles Fitch as teenage Randall Pearson
Niles Fitch plays teenage Randall Pearson, the version of Randall who is building the polished, high-achieving identity that follows him into adulthood. His storylines often involve academic pressure, dating Beth, race, and the effort to look steady even when he is not.
Mackenzie Hancsicsak as young Kate Pearson
Mackenzie Hancsicsak plays young Kate Pearson. This version of Kate is warm, musical, attached to Jack, and already beginning to absorb doubts about herself.
- Watch for: Her close father-daughter moments with Jack.
- Emotional link: Early insecurity that later becomes part of adult Kate's story.
- Why it matters: Her childhood scenes make Kate's grief feel rooted, not sudden.
Hannah Zeile as teenage Kate Pearson
Hannah Zeile plays teenage Kate Pearson, and this age is one of the most important for understanding adult Kate. Grief, self-consciousness, and family tension are much more visible here.
Zeile does not overplay every painful moment, which helps the teenage version feel believable. For viewers trying to connect the timelines, teenage Kate is the bridge between the affectionate child and the adult still carrying unresolved loss.
Parker Bates as young Kevin Pearson
Parker Bates plays young Kevin Pearson. His Kevin is playful and competitive, but also easily hurt when he feels ignored in a family where Randall and Kate often seem to need more attention.
Logan Shroyer as teenage Kevin Pearson
Logan Shroyer plays teenage Kevin Pearson, the popular and athletic version of the character. He often looks confident from the outside, but his scenes show the early shape of Kevin's insecurity and his habit of hiding deeper feelings behind attitude.
Supporting actors in This Is Us
The supporting cast widens the Pearson story beyond Jack, Rebecca, and the Big Three. These characters matter most when they change how a main character sees family, love, forgiveness, or the future.
Ron Cephas Jones as William Hill
Ron Cephas Jones plays William Hill, Randall's biological father. William could have been only a plot twist, but Jones makes him gentle, funny, regretful, poetic, and fully human.
His scenes with Randall are some of the most important in the series because they give Randall a connection to his origins without pretending that lost time can be easily repaired.
Lyric Ross as Deja Pearson
Lyric Ross plays Deja Pearson, who becomes part of Randall and Beth's family. Deja arrives guarded for good reason, and Ross makes her strength feel realistic rather than simply rebellious.
Her storyline is important because it shows that belonging is not instant. In a low-conflict family scene she may seem quiet, while in a higher-stress moment you can see how much trust she is still deciding whether to give.
Eris Baker as Tess Pearson
Eris Baker plays Tess Pearson, Randall and Beth's older daughter. Tess grows from a child into a teenager with her own identity, questions, and need to be understood by parents who do love her but do not always get everything right immediately.
Faithe Herman as Annie Pearson
Faithe Herman plays Annie Pearson, Randall and Beth's youngest daughter. Annie has fewer heavy storylines than Tess or Deja, but she helps make the household feel lived-in instead of built only around big emotional speeches.
Griffin Dunne as Nicky Pearson
Griffin Dunne plays Nicky Pearson, Jack's brother. Nicky changes the family's understanding of Jack because his existence reveals a hidden, painful part of Jack's past.
- First impression: Isolated, difficult, and shaped by old trauma.
- Later function: A second-chance character who complicates the Pearson family history.
- Why he stands out: Dunne gives Nicky dry humor as well as sadness.
Caitlin Thompson as Madison
Caitlin Thompson plays Madison, first known as Kate's friend and later as a major part of Kevin's life. Her role grows slowly, which is why she can surprise viewers who remember her only as a side character from early episodes.
Madison becomes more interesting when the show gives her boundaries and emotional agency. She is not just there to move Kevin's plot forward; she forces him to think about responsibility in a more adult way.
Alexandra Breckenridge as Sophie
Alexandra Breckenridge plays Sophie, Kevin's longtime love. Sophie represents history, affection, damage, and the difficult question of whether two people can return to each other without repeating the same mistakes.
Why does This Is Us use different actors for the same characters
This Is Us uses different actors for the same characters because the show is built around time jumps. Childhood, teenage years, adulthood, and later life all matter to the story, so the casting has to make each age feel clear and emotionally believable.
To show the Pearson family across different timelines
The show often places different decades next to each other: Jack and Rebecca as young parents, the Big Three as children, and the adult siblings dealing with the consequences years later. Separate actors make those jumps clear without needing constant explanation.
That matters because many episodes rely on emotional echoes. A small childhood moment may suddenly explain an adult argument, a parenting choice, or a sibling rivalry that has lasted for decades.
To make each age of the Big Three easy to follow
Using separate actors gives each age of Randall, Kate, and Kevin a clear identity. Young Randall is not simply a smaller version of adult Randall; teenage Randall has his own pressures. The same is true for Kate and Kevin.
- Child scenes: Usually show early family patterns.
- Teen scenes: Often show grief, insecurity, rebellion, or identity taking shape.
- Adult scenes: Reveal how those earlier patterns still affect choices.
To show how the characters change as they grow up
The multi-actor casting lets the audience watch change instead of only hearing about it. Kevin's need for attention, Kate's grief, and Randall's pressure to be perfect all become easier to understand when earlier versions of those patterns appear on screen.
The useful way to read the timelines is not "past versus present," but "cause and consequence." The younger actors show where a feeling starts; the adult actors show what happens when that feeling is carried for years.
Conclusion
The casting works because the show makes every age and relationship feel connected, not because it simply has a large ensemble. If you only need the basics, remember the adult Pearsons first, then match the child and teen actors to the Big Three; that is the easiest way to keep the timelines straight while watching or revisiting the series.