San Diego is a lively and energetic character from the mobile game and anime series Azur Lane. She is personified as the USS San Diego (CL-53), a Cleveland-class light cruiser from World War II. Known for her cheerful personality and frequent self-introduction, she is loved for her comedic moments and catchphrase, 'San Diego number one!' In the story, she plays the role of a supporting character, often bringing humor and lightheartedness to the fleet, while still being a capable fighter.