Mamoru Chiba, alias Tuxedo Mask, anchors pivotal arcs throughout Sailor Moon’s multiverse. A Tokyo high school student orphaned at six by a car accident, his childhood amnesia fuels haunting visions of Princess Serenity and the Silver Crystal. Driven to reclaim his erased past-life memories as Prince Endymion—guardian of Earth during the Silver Millennium—he initially masquerades as a jewel thief, hunting the Silver Crystal to unlock his heritage. The 90s anime depicts his transformation into Tuxedo Mask as instinctive, activated by Sailor Moon’s peril. Without formal incantations, he aids the Guardians by hurling roses or parrying assaults with his cane, his tactics improvisational. By contrast, the manga and *Sailor Moon Crystal* systematize his powers, endowing him with psychic abilities: psychometry to read objects’ histories, healing touch, and energy blasts. Here, he commands the Golden Crystal, a celestial counterpart to Sailor Moon’s Silver Crystal, executing named strikes like the Tuxedo La Smoking Bomber. His romance with Usagi Tsukino (Sailor Moon) intertwines destiny and adversity. Unaware of their shared past as Prince Endymion and Princess Serenity, their bond reforges through memory-loss trials, brainwashing by foes like the Dark Kingdom, and prophecies foretelling calamity if they unite. The live-action series layers complexity via a childhood pact to marry Hina, a duty he initially upholds despite loving Usagi, before fully embracing his Endymion legacy. In *Sailor Moon Eternal’s* Dream arc, a Dead Moon Circus curse embeds a lethal black rose in his chest, sapping his strength. Guided by Helios, guardian of Elysion, he confronts his duty to protect Earth’s spiritual heart. This ordeal awakens his Golden Crystal, enabling him to join Sailor Moon in purifying Elysion and overthrowing Queen Nehelenia. Sacrifice defines his arc. He repeatedly intercepts fatal strikes to shield Usagi, endures possession by Metalia, and in the 30th century, rules Crystal Tokyo as King Endymion alongside Neo-Queen Serenity. Their daughter, Chibiusa, bridges timelines, intertwining his past and future selves. Musical renditions reimagine him as a frontline fighter with exclusive techniques like Tuxedo Mirage, while hinting at Sailor Pluto’s unspoken affection. The live-action series casts him as a morally ambiguous thief whose Tuxedo Mask guise sparks distrust among the Guardians, diverging from his typical noble demeanor. His journey orbits the tension between Mamoru’s mortal life and Tuxedo Mask’s legacy, compounded by abductions and mental manipulation that strain his loyalty. Yet each trial cements his resolve to safeguard both Usagi and Earth, harmonizing his fractured identities into steadfast guardianship.