Michaela Dietz: Michaela Dietz. Actress: Steven Universe. Michaela Dietz is an actress, singer and voice actress whose professional career started in 2005. She is known for playing the role of Riff on the PBS children's television series Barney & Friends, the voice of Amethyst on the Cartoon Network television series Steven Universe and as the voice of Danelda on the Cartoon Network series Mighty Magiswords.
Known For: Steven Universe (AmethystAmethyst GuardsClusterGem WarriorHand MonsterHoppyMonsterPearPercyZooman Walla), The Witcher: Nightmare of the Wolf (Tomas(voice)), Steven Universe: Attack the Light! (Amethyst(voice)), Lego Dimensions (Chunk(voice))