Carmen Yeh

 was a human of Chinese descent who was a companion of Compassion.

Biography
In 1758, Yeh was accidentally left in Alaska by a member of the Great Houses. Soon after this Yeh met Compassion, who was also left in Alaska after her companion from the Homeworld had left her. Compassion offered to "give [Yeh] a lift" while Compassion searched for her previous companion; the two travelled together for three years.

During their time together, Yeh persuaded Compassion to meet with the War King. Yeh gathered plenty of knowledge of the War during her travels and wrote that Compassion thought the enemy was just a distraction and the true threat was from "family". Compassion later suggested that the emergence of House Lucia would be the indication of the real threat showing itself.

Yeh and Compassion were present at the assassination of R. B. Nevitz.

One of their most notable misadventures took place in the "frontier of time" between the Great Houses' territory and the posthuman future. There, Compassion became greatly distressed upon finding the remains of the 103-form timeship "Percival"; she then confronted the War King in the middle of a state dinner. Compassion created a second pact with the War King and the head of House Mirraflex shortly before she stopped travelling with Yeh.

After leaving Compassion and settling down, Yeh wrote her (allegedly fictitious) memoir Fantastical Travels in an Infinite Universe, where she calls herself "Yvette Carlton" and Compassion "Laura". (PROSE: The Book of the War)

Behind the scenes

 * Before her first official appearance in The Book of the War, Carmen appeared as a companion of the Eighth Doctor in Ian McIntire's unlicensed short story Schrodinger's Botanist from the charity anthology Perfect Timing. She was captain of an ElleryCorp shipping vessel, whose only other passenger was an artificial intelligence named LEO. When the Doctor arrived on their ship, he discovered that ElleryCorp was using Carmen as an experiment on human sanity in isolation, and LEO tried to kill them both. However, the Doctor stopped LEO and left with Carmen.
 * "Carmen Yeh" is an anagram of "Archenemy".