Mamoru Chiba is a central figure across the Sailor Moon franchise, appearing in the 90's anime, Sailor Moon Crystal, manga, and live-action adaptations. He lost both parents in a car accident on his sixth birthday, causing retrograde amnesia that erased his earlier memories. This trauma led to recurring dreams of an unidentified woman urging him to find the "Legendary Silver Crystal" to regain his past. His search drove him to adopt the persona of Tuxedo Mask, a mysterious figure who sometimes resorted to jewel theft in the manga to locate the crystal. As Tuxedo Mask, he wears a black tuxedo, white mask, top hat, and red-lined cape. He uses roses as projectiles and wields a cane in combat. Initially, in the anime, his transformations were involuntary, triggered by Sailor Moon's peril, though he later gained conscious control. The manga and Sailor Moon Crystal expanded his powers, granting him named attacks like "Tuxedo La Smoking Bomber," along with psychic abilities such as psychometry, healing, and visions connected to the Earth's well-being. His name's kanji—"Chi" (Earth) in Chiba and "Mamoru" (to protect)—signifies "Protector of Earth." His past life as Prince Endymion of Earth's Golden Kingdom is fundamental. He defied laws to romance Princess Serenity of the Moon Kingdom during the Silver Millennium. Both were killed in Queen Metalia's invasion and later reincarnated as Mamoru and Usagi Tsukino (Sailor Moon). Their present relationship evolved from initial antagonism, marked by Mamoru teasing Usagi, to deep commitment. This bond faced tests, including a temporary separation forced by prophetic dreams during the Black Moon arc and a physical weakening curse from the Dead Moon Circus due to his link to Earth's suffering. Mamoru frequently endures manipulation and brainwashing. Queen Beryl captured and controlled him after he regained Endymion's memories in the Dark Kingdom arc, turning him against the Sailor Guardians until Sailor Moon intervened. In the Black Moon arc, his future self, King Endymion, sent him nightmares to test his bond with Usagi. The live-action series depicted him coerced into joining the Dark Kingdom to protect others, becoming "Dark Prince Endymion." Beyond romance, Mamoru is the guardian of Earth's Golden Crystal, analogous to the Sailor Guardians' Sailor Crystals. While not classified as a Sailor Guardian due to differing conventions, he serves as Earth's protector. His powers often synergize with Sailor Moon's, combining their crystals to defeat threats like Queen Metalia or Pharaoh 90. In the Dream arc, he awakened the Golden Crystal to aid Eternal Sailor Moon in purifying Elysion, reinforcing his custodial role. In the future timeline, Mamoru becomes King Endymion, ruling Crystal Tokyo with Usagi as Neo-Queen Serenity. They have a daughter, Chibiusa. Her interactions with Mamoru in the present, such as him comforting her during distress in the Black Moon and Infinity arcs, illustrate his nurturing and protective traits. His character spans past, present, and future, consistently focused on safeguarding those he cares about and the planet he is destined to protect.