Kimberly Brooks is the voice actress for Jasper. She is also the voice of various other Jaspers (including "Skinny"), Carnelian, Cherry Quartz, Ocean Jasper (in "A Very Special Episode"), other Rose Quartzes, and Jasper's side of her fusions (Malachite and the corrupted Zebra Jasper fusion).
She is an American voice actress in the anime, feature films, video games, and theater industry. She has played Ashley Williams in the Mass Effect series, Barbara Gordon/Oracle in Batman: Arkham Asylum and Batman: Arkham City, Batgirl in Injustice: Gods Among Us, Daisy Fitzroy in BioShock Infinite, Shinobu Jacobs in No More Heroes and No More Heroes 2: Desperate Struggle, Luna in the Scooby-Doo franchise as part of the Hex Girls, Princess Allura in Voltron: Legendary Defender, Sira Moonwarden in World of Warcraft: Battle for Azeroth, and Stormy in the Nickelodeon Dub of the Winx Club. She also played the voice of Howard's phone in The Big Bang Theory, the voice of Buena Girl, Snow Pea and Cindy Slam in Mucha Lucha, and voiced Amsaja in Cleopatra in Space.
- Kimberly Brooks (Jasper's voice actress) studied at Stevenson University, whose name coincidentally bears great resemblance to the show's name.