Eliza Cooper

Eliza Cooper was an agent of the Torchwood Institute.

Biography
In 1889, she and Robert Lewis traced the Doctor and deduced he was stranded in London. (IDW: The Time Machination)

In 1906, Eliza and Robert went through a time machine, but were transported to a different planet thousands of years into the future. There they encountered the Doctor, and at first attempted to arrest him. Eliza however, soon realised that they needed the Doctor to return home, and was ready to trust him due to having seen his previous heroics in their files and the words of Jack Harkness.

Eliza decided to stay on the planet and help its inhabitants rebuild their world. (IDW: Final Sacrifice)