Librarian

First-Light-Weaves-Living-Song, more commonly known as The Librarian, is hero hailing from the Halo Universe.

The Librarian is a Forerunner and is basically all that remains of them, until the accidental release of her husband, The Didact.

She had serious care and respect to all sentient life, most notibly humanity, and had indexed the sentient life in order to find and/or create ways to protect them from the Flood.

Besides Dr. Halsey, the Librarian reveals that she had also contributed to Master Chief's superhuman abilities by placing genes in his DNA to make him immune to the Composer's effects, and also placed seeds for human re-population, resulting in an indirect involvement to the creation of the SPARTAN-II Program.