But at our core, librarians no matter where they work just want to make the world a better place.
Here's a couple, but definitely go on over to the post and check the rest out:
Rex Libris in the Rex Libris comics
Rex Libris is the "tough-as-nails Head Librarian at Middleton Public Library," who strikes fear into recalcitrant borrowers — and also battles "loitering zombies" and alien warlords who refuse to pay their late fees. His teleportation crystals let him travel to any corner of the universe to battle evil. "With fists of steel and mind as sharp as a tack, Rex is a true guardian of knowledge, foe of the foolish, defender of the Dewey Decimal System, and the best hope for the future of civilization."
Giles in Buffy The Vampire Slayer
Rupert Giles is the school librarian at Sunnydale High, but he's also got a secret — he's a Watcher, who guides Buffy on her journey to become the savior of the world. And he sometimes rolls up his sleeves and goes out to save the world on his own. Not to mention, Giles has another secret on top of that one — he's also Ripper, a ruthless, maybe slightly psycho, former wizard who's not afraid to get his hands a bit dirty. When there are nasty things that need to be done to keep us all safe, you won't have to look further than the book stacks at the high school to find the man to do them. (Thanks to WitnessAria for reminding me of this one.)
I already know a few of these but I'll definitely be checking out a bunch more.