Name: Peridot 
Age: functionally immortal, exact age unknown but probably very very old
Gender: Genderless
Appearance:
[url]http://vignette4.wikia.nocookie.net/steven-universe/images/e/e5/Peridot_Done.png/revision/latest?cb=20150227040711[/url]
Canon, AU, or OC?: Canon
Universe of Origin: Steven Universe
Personality: Peridot is very much a ruthless being. She follows her orders with little concern for who or what she might hurt or kill in the way. She has absolutely no problem killing or destroying anyone or anything that gets in her way. She is also very intelligent, and understands the advanced technology of her people very well. 
Abilities/Weapons: Peridot has complete mastery of a variety of advanced gem technology at her disposal, including seemingly limitless marble android drones, a weapon that can disrupt the physical form of energy based beings (but is worthless on organic life), access to EMP bombs to destroy and/or disable any technological constructs around her, and the use of an integrated touch pad in her hand. Like all gems, Peridot is capable of shapeshifting, and can retreat into her gemstone to heal when badly injured. 
Backstory: Not much is really known about Peridot. She appears just to be a technician, dealing with the more advanced tech that common people have no time to bother with. 
Faction: Shadow Eternity