The product visual design emphasizes U-556's youthful charm and naval motif. The figure is posed with a slight lean in a dynamic stance, as if stepping from the deck into a calm sea. She wears a stylized sailor uniform: a fitted jacket with crisp trim, a short pleated skirt, and knee-high stockings, all sculpted with precise folds and creases for a realistic look. Accessories include miniature sub-hull elements and a compact base that resembles wave ripples and deck plating. The paintwork highlights metallic accents on buttons and insignia, with shading to convey depth, light, and texture across the figure and clothing.

Within Azur Lane's setting, U-556 embodies the eager, determined submarine persona: friendly with allies, quick with a joke, and fiercely loyal to her sisters in arms. She often leads scouting missions beneath the waves, using her wit and tenacity to outmaneuver opponents. Her backstory involves a quest to prove herself among the formidable fleet by blending stealth with courage, forming bonds with other ship girls, and discovering that true strength comes from teamwork. Off duty, she enjoys small comforts from the surface world and dreams of charting new routes across the ocean, learning about different ports, cuisines, and friend ships.