Mamoru Chiba is a fictional character from the popular anime and manga series Sailor Moon, created by Naoko Takeuchi. He is known as Tuxedo Mask, a mysterious hero who aids the main character, Usagi Tsukino, also known as Sailor Moon, in her battles against evil forces. Mamoru is a college student with a strong sense of justice and a deep connection to Usagi. In the series, Mamoru possesses the ability to fight alongside the Sailor Guardians, using his intelligence and combat skills. He has a complex backstory, including memories of a past life as Prince Endymion, which ties him to the Moon Kingdom and its princess, Serenity. His character development is central to the themes of love and sacrifice in the series.