TV-Series
Description
The character known as Code:001, often referred to as the Klaxosaur Princess or the Princess of the Klaxosaurs, is introduced as the final surviving member of the Klaxosaur race, also known as the Klaxo-sapiens. She is an ancient being who has existed for over sixty million years, having lived alone since the time of her civilization's war with the alien race VIRM. Her physical appearance is distinct and inhuman, characterized by long white hair, blue eyes, blue-tinged skin, and two prominent blue horns on her head. The most notable features on her back are eight spider-like appendages, or tentacles, which she can freely control and use for combat. Dr. FranXX, the creator of the FranXX units, regarded her as a beautiful and complete existence.

The personality of 001 is initially defined by a cold and fiercely protective nature. She holds a deep-seated hatred for humanity, whom she blames for attacking and exploiting her brethren to harvest magma energy, the lifeblood of the Klaxosaurs. She refers to the human leadership, the Seven Sages or APE, as "pseudo-humans" or "damned human wannabes," demonstrating her awareness of their true, alien nature. 001 is resolute and does not hesitate to use lethal violence when she feels threatened or to achieve her goals, as seen when she easily kills two of the Seven Sages who came to negotiate with her. Her primary motivation is singular and unwavering: to protect the Earth from VIRM, the alien force that her people fought eons ago. She has spent her immense lifespan waiting for VIRM's return, commanding the monstrous Klaxosaur forces via a telepathic scream to serve as the planet's defense system.

Within the story's later arcs, 001 serves as a pivotal figure who reveals the true history of the world. She is the original source from which Zero Two was cloned, as Dr. FranXX used her hair to create the hybrid being. In her first encounter with the doctor, she bit off his left arm as punishment for harming her kind, demonstrating her intolerance for those who exploit her people. Her relationship with the protagonist, Hiro, marks a significant turning point. When she forcibly ejects Zero Two from the FranXX Strelizia to pilot it with Hiro, she enters the Star Entity, a massive weapon. However, she discovers it has been booby-trapped by VIRM to self-destruct.

Throughout her interaction with Hiro, she is confronted with his optimistic and selfless determination to fight for the sake of living, which contrasts with her own pessimistic view that victory against VIRM is impossible. She admits that her kind believed abandoning emotional ties for solitude would make them a perfected form. Observing the powerful bond between Hiro and Zero Two, she comes to understand the strength that can be found in partnership with others. This realization leads to her ultimate act of development and sacrifice. Seeing Zero Two's love and resolve, 001 willingly transfers all her remaining power and control of the Star Entity to Zero Two, enabling the couple to fight back against VIRM. She thus completes her ancient mission by entrusting the future of the planet to the two of them, ending her long life as a core catalyst for the final battle against the alien invaders.
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