The main cast are four that are not so well-known but there is so many well-known actors that provide voices like Nicki Minaj, Aimee Mann, Sinbad, Brian Posehn, Kate Micucci, Charlene Yi, Joel Hodgson and various others.
Zach Callison as Steven
He voices Steven Universe, he was about 14 or 15 when he started. He was born in 1997.
40-year-old Deedee voices Pearl, the smart and tactical one. She gives her a motherly tone but also a very strong and brave voice. She has done some great acting in the episode "Rose's Scabbard." She also appears as Jasmine on the Disney's Aladdin: A Musical Spectacular soundtrack. She later played the role of Nessarose on the first national tour of Wicked, from December 12, 2006 until November 16, 2008. She most recently reprised the role in the San Francisco sit-down production at the Orpheum Theatre. The child of immigrants from the Philippines, who were a sailor in the United States Navy and a Nurse, growing up in San Diego and Orlando.
Estelle as Garnet
30-something Estelle Fanta Swaray is a British singer, songwriter, rapper, actress and producer from West London, England. Estelle is known for her eclectic mix of various musical genres including R&B, soul, reggae, grime, hip hop and dance. She has experienced mainstream success with the single "American Boy" featuring Kanye West, reaching number 1 in the United Kingdom and her collaboration with David Guetta in "One Love". She voices Garnet, the strong silent type. She has sung one song in "Jailbreak."
Michaela Dietz as Amethyst
Michaela Dietz is an Asian-American actress. She provided the role of Riff on Barney and the voice of Amethyst. Dietz was hired for the role of Riff after she was hired to use her voice in a video game.
Tom Scharpling as Greg Universe
Tom Scharpling is an American radio host, comedian, television writer, producer and music video director. He is best known for hosting the weekly radio call-in comedy program The Best Show and for acting as a writer/executive producer for the TV show Monk. He voices Greg Universe and Yellowtail for the series Steven Universe.
Susan Egan as Rose Quartz
Susan Egan is an American voice actress and singer known for her work on the Broadway stage. She is best known for originating the role of Belle in the Broadway musical adaptation of the Disney animated feature Beauty and the Beast as well as for providing the voice of Megara in the Disney animated feature Hercules. She voices Rose Quartz, the Lady from Under the Knife on Fusion Cuisine, and the Tiny Floating Whale for the series Steven Universe.
Grace Rolek as Connie
She is a young girl who voices Connie. She often provides additional/background voices for characters in many movies, including Cloudy With A Chance of Meatballs and Kung Fu Panda.
Reagan Gomez-Preston as Jenny and Kiki
Reagan Gomez-Preston" is an actress and writer who voices the characters Jenny and Kiki Pizza in Steven Universe. She played Zaria in Parent Trap, a WB sitcom in 1995.
Brian Posehn as Sour Cream
Giant comedian Brian Posehn who has been on many sitcoms and shows and movies voices the DJ Sour Cream, son of Videlia and brother of Onion.
Sinbad as Mr. Smiley
The arcade owner and sometimes carnival owner Mr. Smiley is voiced by 90's popular comedian Sinbad.
Kate Micucci as Sadie
Kate Micucci who is part of a msucial comedy duo and has been on The Big Bang Theory as Lucy, voices the sweet Sadie from the Donut shop.
Joel Hodgson as Mayor Dewey
Joel Hodgson the creator of “Mystery Science Theater 3000” voices Mayor Dewey.
Guests:
Nicki Minaj as Sugilite
Nicki Minaj is a famous singer for songs like "Superbass," "Anaconda," "The Night is still Young," and "Starships." She voiced the combination of Amethyst and Garnet.
Nicki Minaj is a famous singer for songs like "Superbass," "Anaconda," "The Night is still Young," and "Starships." She voiced the combination of Amethyst and Garnet.
Alexia Khadime as Sardonyx
Alexia Khadime is an English actress, voice actress, and mezzo-soprano. A veteran of London's West End, Khadime has played several iconic roles, including Elphaba in Wicked, Eponine in Les Miserables, Nabulungi in The Book of Mormon, and Nala in The Lion King. She voiced Sardonyx in one episode, the combo of Pearl and Garnet.
Aimee Mann is an American rock singer, singer-songwriter, bassist and guitarist. She was the bassist and a vocalist for the band 'Til Tuesday during the 1980s and since then she has primarily released albums and performed as a solo musician. She played the combo of Amethyst and Pearl.
Charlene Yi as Ruby
She was in the film Knocked Up. She is a comedianne and writer, she voices Ruby, one half of Garnet.
Erica Luttrell as Saphire
She was in Honey, I shrunk Ourselves, she voiced one half of Garnet.
