Peridot, specifically Peridot Facet-2F5L Cut-5XG is a member of the Crystal Gems who made her debut in "Warp Tour". She was originally a Homeworld Gem technician and a certified Kindergartner. After being stranded on Earth following the events of "Jail Break", she acted as a recurring antagonist until becoming more of an anti-hero and pseudo-antagonist by establishing a truce with the Crystal Gems in "When It Rains" to help them save the Earth from the Cluster. She officially became a member of the Crystal Gems in "Message Received" after she defied her Homeworld superior, Yellow Diamond. For some time, Peridot lived in the barn with Lapis Lazuli. As of the events of "Raising the Barn", she resided in the Crystal Temple. In the events of Steven Universe: The Movie and onward, she lives with Lapis Lazuli and Bismuth in Little Homeworld.

EDIT:You'll also be voicing any Peridot from Homeworld(Including one of the main villains:Squaridot)