Cheni

 was the empress of the Drashani Empire. She was the daughter of Tuvold. She became empress because of the Succession of Blood. She went undercover to Cawdor. She wanted to help the Sixth Doctor and was delighted to hear that Kylo Sorsha was alive. She wanted to marry him. Kylo made her into an Igris. (AUDIO: The Acheron Pulse)