Locke is driven to protect women he meets. His want to protect women is due to unresolved guilt over a past incident which he struggles with and made him join the Returners. Although he blames himself, he is angry at the Empire for their involvement.
Despite his tragic past, Locke is often less than serious. He jokes around with and about the other party members. He is proud of his skills and insists being called a “treasure hunter” or “adventurer” rather than a thief. Locke is kindhearted and tries to prevent others from experiencing the sorrow he has.