Wearing a mask to conceal his identity, he interferes with enemy operations, offers the Sailor Guardians advice, and sometimes physically aids them in battle.

He also has psychic powers, including psychometry and healing, which evolve and become important to the storyline in the manga, but which play only a minor role and remain static in the anime.

Along with his primary love interest Sailor Moon, a significant player in much of the story, he has royal credentials in the "past life" storyline as well as in the future.

Before the beginning of the series, his parents are killed in a car crash on his sixth birthday, which revealed the memories of his previous life as Prince Endymion.

As Mamoru, he tries to piece together his strange dreams, and as Tuxedo Mask, he tries to remember his past and identity, while searching for Princess Serenity.

Sailor Moon Crystal, the second anime adaptation, follows the manga continuity and thus has Mamoru as a high school student, without much interaction with Rei.

In the final battle against the Dark Kingdom, Queen Metaria absorbs Sailor Moon and Tuxedo Mask into her body.

[10] Tuxedo Mask also combines his power into Super Sailor Moon's last item with the rest of the Guardians using the Golden Crystal.

However, several of his relationships change in different settings: for example, one musical reveals Queen Beryl as Mamoru's fiancé from his time as Prince of the Earth.

In this version of events, Serenity and Endymion are outlaws (similar to Romeo and Juliet) who drive an otherwise innocent woman, Beryl, to evil by making her jealous.

[13] Another variation occurs in the Ryuusei Densetsu musical, when Galaxia does not kill Mamoru, leaving him able to fight alongside the Sailor Guardians.

[17] Once he regained his memories of his past and present lives, he assumed his Endymion form to help the Sailor Guardians and tried his best to protect Usagi from the dangers of overusing the Silver Crystal.

[21] As a character with different incarnations, special powers, transformations, and a long lifetime spanning the Silver Millennium era and the 30th century, Mamoru gains multiple aspects and aliases as the series progresses.

"Tuxedo Mask" represents a disguise Mamoru created for himself in order to hunt for the Silver Crystal incognito and—later—to assist the Sailor Guardians in battle.

He appears less developed, and has no special powers or named attacks, but remains a constant force in helping the Sailor Guardians throughout the series when they are in trouble.

Luna initially tells Usagi not to trust him, but relents when they begin to fall in love and his true identity emerges.

His function goes beyond that of the rescuer portrayed so often in the anime – it is frequently Sailor Moon who goes to his rescue, and he lends her strength, support, and guidance to use the Silver Crystal to defeat the enemies in return.

Moonlight Knight (月影の騎士, Tsukikage no Naito), clad in Arabian robes while possessing a saber and white roses, appears in the 1990s anime during the "Hell Tree" arc of Sailor Moon R. When Usagi wished to be a normal girl at the end of the 90s depiction of the "Dark Kingdom" arc, Mamoru was included with the Sailor Guardians' memories being magically sealed to resume civilian lives.

[37] Like with Tuxedo Mask, with even Mamoru a suspect, Usagi assumed every cute guy she met was Moonlight Knight before learning his true identity.

In both the anime and manga he uses psychometry to read past, present, and future events through touch,[38] and heals others' wounds through psychokinesis.

[39] Inconsistently, he is shown teleporting; just once in the anime while under Queen Beryl's power,[40] and several times as Prince Endymion in the live-action series.

"[44] He also acquires a transformation in the live-action series, using the same phrase, which is a part of an outrageous story he tells Usagi about how he became Tuxedo Mask.

This transformation is initiated with a special band-aid, and the sequence consists of Mamoru pulling on his pants and coat with dramatic flair.

Tuxedo Mask's roses are red, the evil Prince Endymion's are black (and electrified), and the Moonlight Knight's are white.

Tuxedo Mask's secondary weapon, his cane, often serves as a sword,[49] and he can extend its length, either to attack or to rescue people.

[52] Takeuchi designed the character of Tuxedo Mask as her own ideal of a man,[53] describing him as "strong, silent, unshakeable, a little like Captain Harlock.

[63][64] In the stage musicals, different actors and actreses have played Mamoru: Mizuki Sano, Yūta Mochizuki, Yuuta Enomoto, Kousei Amano, Hidemasa Edo, Kenji Urai, Yuu Shirota, Gyo Miyamoto, Yūga Yamato, Mikako Ishii, Riona Tatemichi,[65] and Mitsuki Tenju.

[69] The official Sailor Moon-character popularity-polls listed Mamoru Chiba, Tuxedo Mask, and Endymion as separate entities.

[70] One year later, now with fifty choices, King Endymion became the eighteenth most popular character, while Tuxedo Mask and Mamoru came in at twentieth and twenty-first respectively.

This character was based on Makoto Hanmatsuura, who bid ¥2 million in a charity auction for the Kobe earthquake disaster to be put in the Sailor Moon manga.