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Michaela Dietz
Michaela Dietz at the Florida Supercon 2016 (4) (cropped).jpg
Dietz at the 2016 Florida Supercon
Michaela Keenan Dietz

November 1, 1982 (1982-11-01) (age 38)
Alma mater Middlebury College
Occupation Voice actress
Years active 2005–present

Michaela Keenan Dietz (born November 1, 1982) is a Korean-American voice actress whose professional career started in 2005. She voiced the character of Riff on the PBS children's television series Barney & Friends, Amethyst on the Cartoon Network television series Steven Universe and Steven Universe Future, Dolly Dalmatian on Disney's 101 Dalmatian Street and P.i.t.a. in Fallout 76.

Early life

Dietz was born in South Korea on November 1, 1982, then was adopted and raised in Cooperstown, New York. She studied International Studies at Middlebury College. She has spoken about how her experience as an adoptee informs her performance as Amethyst on Steven Universe.


Dietz has voiced ongoing characters in two American children's animated TV series, Riff in Barney & Friends and Amethyst in Steven Universe and its epilogue series Steven Universe Future.

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Year Film Role Notes
2005 Discover Me Ellie
2009 Red, Black & Blonde Auditioning Dancer #1 Short
K-Town Interracial Couple #3
2012 Totally Smooth Sherry Short
2019 Steven Universe: The Movie Amethyst (voice) TV movie
Television – Barney & Friends
Year Title Role Notes
2007 Barney: Let's Go to the Firehouse Riff (voice)
Barney: Dino-mite Birthday Riff (voice)
2008 Barney's Animal ABCs Riff (voice)
Hi! I'm Riff! Riff (voice)
Barney: The Best of Barney Riff (voice)
2009 Barney: Once Upon a Dino-Tale Riff (voice)
Barney: Let's Go on Vacation Riff (voice)
Barney: Jungle Friends Riff (voice)
Barney: We Love Our Family Riff (voice)
2010 Barney: Let's Play Outside Riff (voice)
Barney: A-Counting We Will Go Riff (voice)
2011 Barney: Big World Adventure: The Movie Riff (voice)
Barney: 123 Learn Riff (voice) Video Short
Barney: I Can Do It Riff (voice)
Barney: A Very Merry Christmas: The Movie Riff (voice)
2012 Barney: Planes, Trains & Cars Riff (voice)
Barney: Clean Up, Clean Up! Riff (voice)
Barney: I Love My Friends Riff (voice)
Other television
Year Title Role Notes
2009 Workshop Female Detective Episode: "A Little Cocky"
2011 Fo Fo Figgily Animated Series Fo Fo (voice) Video Short
2012 My America Role Unknown Episode: "Hit and Run"
2013–2019 Steven Universe Amethyst, Hoppy, Gem Warrior, Hand Monster, Percy, Amethyst Guards, Zooman Walla, Monster (2), Gem Soldiers, Cluster, Obsidian (voice) Main role
2015 Louis and Georges Louis (voice) Nickelodeon short
2017–2018 Mighty Magiswords Danelda (voice) 2 episodes
2019–2020 101 Dalmatian Street Dolly Dalmatian (voice) Main role
2019–2020 Steven Universe Future Amethyst, Blue Lace Agate, Ocean Jasper, Famethyst, Red Striped Jasper, Chert (voice) Main role
2019 Pizza Hero Fumika Fumika Cutter (voice) Main role (pitch short)
2020 Adventure Time: Distant Lands Glass Boy (voice) Episode: "Obsidian"
Craig of the Creek Michelle Green (voice) Episode: "The Rise and Fall of the Green Poncho"
2021 Kid Cosmic Blue Behemoth (voice) 2 episodes
Tuca & Bertie Dottie (voice) Episode: "Planteau"
Monsters at Work Additional monsters, Snore (voice) Recurring
Video games
Year Title Role Notes
2013 Grand Theft Auto V The Local Population
2014 Cartoon Network Superstar Soccer: Goal Amethyst Mobile phone game
2015 Steven Universe: Attack the Light Amethyst Mobile phone game
Lego Dimensions Chunk
2017 Steven Universe: Save the Light Amethyst
2019 Steven Universe: Unleash the Light Amethyst
2020 Fallout 76: Wastelanders Dorothea Dias, Fuzzy Brenda, Maggie "P.I.T.A" Stern, Dr. Nowak, Blood Eagles DLC
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