Cia is the main antologist in the game "Zelda Hyrule Warriors".
Cia was originally the Guardian of Time tasked with watching and keeping the balance of the Triforce, Cia eventually began to harbor romantic feelings for the hero Link. These affections turned into jealousy towards Princess Zelda, a close friend of Link's. As Cia's resentment grew, she became vulnerable to the will of an evil being that was thought to have been sealed away long ago. With the light half of her soul driven from her body Cia was corrupted by the darkness in her heart. Cia and her two primary comrades, Volga and Wizzro, now stand against Link, setting a war for Hyrule into motion.
Originally a person of morals, Cia has grown provocative and aggressive due to her corruption. She is not afraid to speak openly about her desires and thus has a strong sense of self. She wants to make the world and everything in it hers, especially Link.
She shares some similarities with Veran, in that they both have similar outfits (including Cia's dress having elements used in Veran's concept designs) and can both summon multiple Dark Links.