Finicia Portillon (Varaxil)

 was the twin sister of Lucern. She travelled back to 17th century with the Eighth Doctor and Mary Shelley to find the witch that was trapped in a well. She said her father was Aleister Portillon, but he was childless. She was a Varaxyl who impersonated the daughter of Claude Portillon. (AUDIO: The Witch from the Well)