Gideon Nav is a fictional character from the science fiction novel series called The Locked Tomb by Tamsyn Muir. She is known for her strong personality, wit, and combat skills. Gideon serves as the protagonist in the first book, titled Gideon the Ninth, where she is a necromancer's bodyguard and becomes embroiled in a deadly competition among the houses of the Necromancer society. Gideon is characterized by her rebellious nature and desire for freedom, often clashing with authority figures. Her journey explores themes of loyalty, identity, and the complexities of relationships, particularly with Harrowhark Nonagesimus, the necromancer she protects.