A Guardian protects the Librarian, assists him on missions, and acts as a voice of reason when needed. Most importantly, a Guardian must be willing to put their life on the line if the Librarian's own life is in danger.

The Librarian's survival is perhaps the most important thing there is.

[ In her world, anyway. ]

Fascinating. I had no idea such a thing was possible. [ It's interesting, Peter, that's why she's asking. Where she's from, planets and humans don't form relationships. That's not to say that they can't or shouldn't; it's just a little outside her frame of reference. ]