Emma BeckerSutton's twin sister and a girl who has moved from foster home to foster home despite being initially adopted by a rich family in Beverly Hills. She switches places with Sutton to escape accusations made by her last foster brother. Is the nicer and more thoughtful twin.
Sutton MercerThe adopted daughter of the Mercers and Emma's twin sister. She lived happily as a rich girl in Phoenix until she discovered she had a twin after coming home from a trip to Paris, she decides to go to LA and look for their biological mother.
Madeline "Mads" Rybak
Thayer RybakAlec's son and Mads' older brother. He is keeping the twins' secret and helping them solve their mysteries. Was an Unlucky Childhood Friend for Sutton but recently developed feelings for Emma.
Ethan WhitehorseSutton's boyfriend who ends up falling in love with Emma.
Ted MercerSutton's adoptive father and birth father of Laurel. Is married to Kristin and best friends with Alec. He has several secrets, several revolving around both Annies and Justin.
Kristin MercerSutton's adoptive mother and birth mother of Laurel. Is married to Ted and oblivious of many of his secrets.
Alec RybakThe Phoenix District Attorney and father to Mads and Thayer. Can be controlling and may have some secrets. Is best friends with Ted and beginning a relationship with Rebecca Sewell.
Annie 'Rebecca' Sewell
Char ChamberlainOne of Sutton's True Companions. She's initially suspicious of Emma's actions in Sutton's place, but eventually embraces it as a new direction in their friendship.
Nisha RandallAn ex-friend of Sutton's who is technically the series Alpha Bitch, she's not as profilic as her character type is on other shows. She still seems to want to be friends with Sutton and is mean to her as a means to get her back for whatever she did.
Justin MillerLaurel's first official boyfriend and a golf jock. He pretends to be as wealthy as the other Arroyo but is actually secretly living in a foreclosed home. He tells Laurel that his parents dies years ago in a car crash but later in series it's revealed he has ulterior motives.