Beatrix Amerhauser, often called Bea by her companions, is a main character introduced in the series as a former college student from Germany who became deeply fascinated with Japanese culture. Her journey to Japan was driven by a singular, passionate dream: to eat the best sushi ever made. This dream persisted even after a zombie pandemic broke out during her tour of the country, transforming her from an ordinary tourist into a determined survivor. Her background reveals a dedicated individual who spent years studying Japanese language, history, and customs long before she ever set foot in the country.

In terms of personality, Beatrix is a free-spirited, kind, and outgoing young woman. She becomes genuinely enthusiastic whenever any topic related to Japan arises, often eagerly explaining cultural details and traditions to her friends, even those who are native Japanese. Her friendliness and goal-driven nature are evident in her relentless persistence to secure fresh fish to fulfill her sushi ambition, a task she pursues with unwavering dedication regardless of the zombie hordes in her way. She is notably unselfconscious and pragmatic, demonstrated by her lack of embarrassment when the situation calls for communal bathing, as she happily disrobes to join her male companions in a hot spring, explaining the historical precedent for such practices.

Beatrix's primary motivation throughout her introduction and subsequent travels is the desire to experience authentic, high-quality sushi made by a master chef. This quest leads her to secure a truck full of fresh fish and drive it toward the last known sushi chef in the Takasaki area. Her role in the story solidifies when she encounters the main group consisting of Akira Tendou, Kenichirou Ryuuzaki, and Shizuka Mikazuki. After demonstrating her combat skills by single-handedly dispatching a group of zombies in traditional samurai armor, she pleads for their help in delivering her precious cargo. Their successful collaboration results in a celebratory sushi feast, after which Beatrix decides to continue traveling with the group, becoming a core member of their survivor team.

Regarding key relationships, Beatrix becomes a close friend and ally to Akira, appreciating his willingness to help her with her goal and sharing his energetic and heart-driven approach to life. With Kenichirou, she forms a close friendship but is often repulsed by his perverted advances and his attempts to use her appearance for schemes, such as wanting her to work as a bikini bar waitress. She shares a strong friendship with Shizuka, the two women often uniting against Kenichirou’s inappropriate ideas. Beatrix also forms a bond with Izuna Tokage, whom she cares for protectively like a little sister, even putting herself at risk to shield the younger girl during dangerous escapes. Throughout her journey, her development shows her transitioning from a solo traveler with a single goal to a valued and protective member of a found family, relying on and supporting her companions through various challenges.

Beatrix possesses notable abilities that make her an invaluable asset in combat. Alongside Akira, she serves as one of the group's primary fighters, displaying peak physical condition and expert proficiency with a variety of traditional Japanese weapons. Her arsenal includes a katana, a naginata (a type of spear), and a bow and arrow. She is remarkably talented, capable of cutting zombies in half with her naginata and landing precise, fatal headshots with her arrows. When facing large hordes, she dons a full suit of samurai armor, which provides her with protection from fire and zombie bites, allowing her to dispatch enemies in rapid succession without showing signs of fatigue. Her skill is such that she can effectively fight not only zombies but also other weapon-wielding human foes.