Eternal Sailor Moon is the evolved form of Usagi Tsukino in the Sailor Moon series, appearing in the final arc after gaining a more powerful transformation. She serves as the central heroine and leader of the Sailor Guardians, embodying love, hope, and protection. In this form, she fights against major cosmic threats with enhanced power, grace, and a more ornate celestial appearance. Her role is crucial in the climax of the story, where she confronts overwhelming evil to save the world and her friends.