Maxine Pursar

Maxine Pursar was one of the many guests onboard the spaceship during a party hosted by the Rulers of the Universe. She was a friend of Isabella Clerkwell. (AUDIO: I Went to a Marvellous Party) Later, River Song blew up the party ship killing Maxine and many of the other guests. (AUDIO:The Rulers of the Universe)

Behind the scenes
It is unknown if Maxine was a member of the Rulers of the Universe or not.