U-556 is a character from the mobile game and anime series Azur Lane. Representing a German (Iron Blood) submarine, U-556 is depicted as a cheerful, energetic, and somewhat mischievous young girl with a strong sense of loyalty. She is known for her playful demeanor and her admiration for other submarines, particularly U-47. In the story, U-556 participates in naval battles as part of the Iron Blood faction, supporting her allies with her unique skills and submarine tactics.