Tochtli

 was born on a Nothing day. He was born a month early, and the Doctor helped deliver him. At Tochtli's mother's request, the Doctor buried the umbilical cord on a battlefield.

As an adult, Tochtli was a merchant but was also a spy for the empire. He met the Seventh Doctor and helped him defeat the bonepuppets using the psychic ability he inherited from his mother. (PROSE: Nobody's Gift)