Killian Jones, also known as Captain Hook, is a fictional character from the television series Once Upon a Time. He is portrayed as a charming and complex pirate with a troubled past. Initially introduced as an antagonist, Killian evolves into a hero, showcasing his loyalty and bravery throughout the series. In the show, Killian is known for his iconic black leather attire and his signature hook hand, which he uses in place of his lost hand. His character is deeply connected to Emma Swan, with whom he shares a romantic relationship, adding depth to his storyline and character development.