Koyi Mateil was a Twi'lek female who was present outside the Galaxies Opera House in the Uscru District of the planet Coruscant in the year 19 BBY during a performance of the opera Squid Lake. She was walking alongside Duke Teta up the opera house's steps in front of Ulfor Bombaasa and Opula Deget when the Jedi Knight Anakin Skywalker ran past them on his way to meet with Supreme Chancellor Sheev Palpatine. Mateil had orange skin and brown eyes. She wore a bejewelled white dress and silver headpiece.