Thea Kreutzer captains the Admiral Graf Spee while attending Wilhelmshaven Maritime High School. Born in Berlin on November 21, she hails from a musical family but rejects music studies. Emulating her mother's career as a Blue Mermaid, she enrolled in maritime school, graduating first in her class and earning the "Sea Fairy" moniker. Standing 140 cm tall with a light complexion, she has white hair bearing a pinkish tint and amber eyes. Her hair is styled in a single pigtail fastened by a black bow edged in red. She typically wears the black Wilhelmshaven officer’s uniform adorned with a golden aiguillette and a draped coat. After rescue from infection, she reclaims her school captain’s hat, returned by her deputy. Quietly serious yet nurturing, Thea balances her impulsive friend Wilhelmina and maintains calm under pressure, earning the "little mother" title for her crew care. RATt virus infection triggered violent outbursts: ordering assaults on the Harekaze and attacking Wilhelmina. These extremes vanished post-cure. Infected alongside her crew, Thea led a mutiny against the Harekaze. Pre-infection, she commanded Wilhelmina to flee contamination. The Harekaze disabled the Graf Spee’s screw shaft to escape. Later, after antibody development, Harekaze crew boarded her ship, subdued Thea physically, and administered the cure. Recovered, she hosted a joint celebration with them, then aided critical missions like rescuing the battleship Musashi to repay debts. Her closest bond is with deputy captain Wilhelmina Braunschweig Ingenohl Friedeburg, a middle-school friend whose judgment she deeply trusts. Post-rescue, she forged strong alliances with Harekaze’s crew, particularly Captain Akeno Misaki, proving loyalty through joint missions. Academically exceptional, Thea excels in mathematics and rapidly solves chess or numerical puzzles. She speaks fluent Japanese and demonstrates sharp tactical leadership. Her preferred foods are currywurst and schnitzel.