The goofy, passionate, and hyper-intelligent "Librarian" who loves history and tends to babble when excited. He is eccentric, quick-thinking, and deeply devoted to the Library.

A former NATO counterterrorism agent and the team's "Guardian". She is practical, tough, disciplined, and grounds the more chaotic, magical members of the group.

An art, architecture, and history genius who hides his high IQ under the persona of a rough-around-the-edges Oklahoma oilfield worker and brawler. He is proud, loyal, and physically tough.

A brilliant mathematician and scientist suffering from a brain tumor that causes sensory synesthesia (linking math and memory to visual/auditory hallucinations). She is bubbly, empathetic, and uniquely creative.

A master thief, computer hacker, and trickster from Australia. He loves flash, gadgets, and breaking rules, though he has a hidden heart of gold.

The grumpy, reclusive, and ancient caretaker of the Portland Library Annex. He is sarcastic, pragmatic, and possesses centuries of magical and historical lore.

Dulaque (Lancelot du Lac): The leader of the Serpent Brotherhood and a former knight of the Round Table who is immortal, a master swordsman, and Jenkins' (Galahad's) estranged father.

Lamia: Dulaque’s ruthless second-in-command, a skilled martial artist and assassin who wields katanas and knives and bears the Brotherhood's signature snake tattoo.