Mamoru Chiba, known as Tuxedo Mask, anchors the Sailor Moon Crystal narrative, including Season III. His past begins tragically: a car accident on his sixth birthday claimed his parents and induced retrograde amnesia, erasing his childhood. This loss sparked recurring dreams of a mysterious woman compelling him to find the Silver Crystal, driving his transformation into Tuxedo Mask. In his civilian life, he excels academically and athletically as a student at Moto-Azabu Private High School, often perceived as unnervingly perfect by classmates. During Season III's Infinity Arc, Mamoru supports the Sailor Guardians while balancing daily life with Usagi Tsukino and their future daughter, Chibiusa. Ominous premonitions plague him through dreams and touch-based psychometry, forewarning threats tied to the Death Busters and Mugen Academy. While chaperoning Chibiusa at an amusement park, he encounters Michiru Kaioh (Sailor Neptune), noticing her Deep Aqua Mirror. Michiru's observation of his "noble eyes" underscores his connection to his past life as Prince Endymion. He actively aids strategy against the Death Busters, urging investigations into Mugen Academy following Daimon attacks. Mamoru's powers evolve across official media. As Tuxedo Mask, he wields roses as projectiles and a cane in combat, employing energy projection and healing. His psychometry allows reading objects or people through touch. Manga-specific attacks include the "Tuxedo La Smoking Bomber." He safeguards the Golden Crystal, symbolizing his guardianship of Earth and enabling him to amplify Sailor Moon's power in critical battles against foes like Queen Metalia and Pharaoh 90. The manga further develops his psychic abilities for monitoring planetary energy and interpreting visions. Relationships shape his journey. His bond with Usagi stems from their past lives as Prince Endymion and Princess Serenity, lovers during the Silver Millennium. Overcoming initial amnesia-induced conflicts, they reunite romantically, facing trials like manipulated premonitions causing temporary breakups (Black Moon Arc) and protecting Chibiusa. Mamoru provides stability for Chibiusa, comforting her distress and gifting her a Tuxedo Mask puppet. His Season III interactions with outer guardians like Sailor Neptune and Sailor Uranus involve mutual suspicion alongside shared objectives. Mamoru's story extends beyond Season III. In the live-action series (PGSM), he initially operates as a thief seeking the Silver Crystal, later transforming into Prince Endymion wielding a sword. Musicals expand his lore, depicting him as "Space Knight" and exploring alternate dynamics, such as a past-life fiancé relationship with Queen Beryl. The Dream and Stars arcs reveal his future as King Endymion in Crystal Tokyo, married to Usagi/Neo-Queen Serenity and father to Chibiusa. Across all media, he embodies sacrifice, enduring repeated brainwashing (e.g., by Dark Kingdom, Black Lady) and death, only to be resurrected by Sailor Moon's power. His character evolves from a solitary, amnesiac seeker into a devoted partner and protector. Initial coldness yields to vulnerability, particularly in supporting Usagi’s growth as Sailor Moon. This consistent evolution across manga, anime, and films showcases his unwavering resolve to safeguard Earth alongside her.