Aliases: Mamoru Chiba,
Moonlight Knight (anime),
Metaria Endymion (PGSM),
Space Knight (musicals)
Age: 17-19 (manga),
Early twenties (anime)
Date of birth: August 3
Affiliations: Sailor Team, Dark Kingdom (while brainwashed), Shadow Galactica (manga)
Abilities: Various, mostly natural; psychometry
Mamoru Chiba is the major romantic interest of Usagi Tsukino. He is often portrayed as stoic, steady and introverted. When he was young his parents died in a car crash. This blocked his childhood memories of his current lifetime and opened up the memories of his previous life as Prince Endymion. When this happened he started to see Princess Serenity in his dreams. Early in the manga, he seeks the Silver Crystal because he is convinced that this will restore his memories fully. He is also the character that gets brainwashed and captured the most throughout the series.
Mamoru and Usagi are boyfriend and girlfriend during the series. They were not always on good terms—in both the manga and anime he and Usagi were antagonistic towards each other when they first met and only developed romantic feelings later on. In the manga those feelings developed well before their identities were discovered; in the anime they showed only shortly before their identities were revealed. Once they became a couple, they became deeply devoted to each other and their love survives many trials. In the manga, they briefly show jealousy in Volume 8, Act 25. Also in the anime they break up in Episode 61, but get back together in Episode 77 when King Endymion sent nightmares to Mamoru making him believe if he stayed with Usagi, she would die. He is always addressed as Mamo-chan by Usagi throughout the series during this time period (Chibiusa also addresses him with this nickname later on). After dating for two years, Mamoru gives Usagi an engagement ring at an airport. Their wedding is shown at the very end of the manga. In the future, they become king and queen and have a child together whom they name, Small Lady, but is in the majority of the series known as Chibiusa.
The manga develops Mamoru more extensively, showing that the car crash happened on his birthday and gives a glimpse of his parents. Mamoru also struggles with his identity throughout the manga, first as who he really is, then later if he's in the way of the Sailor Soldiers. A fair amount of subtle characterization is made for Mamoru, and later extending his role within the manga as to who he is. He also is given the power of psychometry, which also showed up in the anime, but was not given a name. This manifests in his ability to see and read dreams (Such as Chibiusa's), heal people and monitor the status of the Earth. This was not fully developed until the Black Moon arc, and was used occasionally throughout the series. Mamoru also has his left ear pierced in the manga, a trait that does not carry over to his anime counterpart.
The anime tends not to develop Mamoru as much, however, he is shown to be more social than his manga counterpart. He's interested in a variety of subjects and is shown as smart. The musical Kakyu Ouhi Kourin shows that he is aspiring to become a doctor. He also dated Rei Hino for a short time before all the past life identities were revealed, but the relationship did not develop very deeply; Rei and Mamoru broke up after it was discovered that Usagi was Princess Serenity.
Tuxedo Mask's importance in the manga is significantly larger than in the anime. In fact, many of Sailor Moon's transformations and final victories come as a result of her and Tuxedo Mask fusing their powers together. In the final battle against the Dark Kingdom, Queen Metaria absorbed Sailor Moon and Tuxedo Mask into her body. However, they were able to combine their powers through the Silver Crystal to destroy Queen Metaria from within. He also combines his power into Super Sailor Moon's last item in the manga with the rest of the soldiers using the Golden Crystal. In the Infinity story arc, he combined his powers with Sailor Moon to create the next scepter.
The manga tends to show Mamoru as quiet, studious, mysterious and stoic. He is often shown being admired by the student body of his high school for these qualities. The anime also tends to make him appear in every episode to save Sailor Moon's life. He did have a few attacks that resemble what would seem like some of the attacks in the manga, but these are not given actual names within the anime.
The dub did not make too many significant changes to his character. He is a bit more extroverted than his original anime counterpart in the voicing. Darien was more likely to yell and get annoyed than Mamoru of the anime, who was often quiet and distant, even when he was annoyed. A line was also added to an episode in the dub that claimed Darien used to be a model, but this was never referred to again. The original line had Mamoru talking about the attractiveness of a girl's character being more important than physical beauty. It also invented karate as one of his hobbies, which was only mentioned in one episode and never mentioned in the original.
In the musicals, Mamoru protects Usagi and is generally by her side. Several of his relationships change from musical to musical, however. For example, in one musical it's revealed that Queen Beryl was Mamoru's fiancé from his time as Prince of the Earth. Associating with the Moon Kingdom was against Earth law, and Endymion violated this law when he associated with Princess Serenity. 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. Sailor Pluto also reveals that she is in love with Endymion, though she has contented herself with watching from afar.
Another variation occurs in the Ryuusei Densetsu musical, when Mamoru is not killed by Galaxia and instead is able to fight alongside the Senshi. Mamoru is typically very involved in Senshi battles, fighting alongside the Senshi as opposed to his anime role of throwing a rose and then letting Sailor Moon deliver the finishing blow.
Tuxedo Mask always gets his own song, though they vary from musical to musical. In one musical, there were multiple songs as both the present Mamoru appeared as Tuxedo Mask and later King Endymion appeared in disguise as Space Knight to look out for Chibiusa.
In the live action version, Mamoru is a much more silent, yet dedicated person. For example he stays loyal to Hina, his girlfriend despite not loving her on a promise they made when they were children. He is in search of the Silver Crystal due to his amnesia and dreams that told him that the magical object could restore his memories. To do this, he donned the Tuxedo Kamen disguise and became a thief, searching for the legendary crystal. Once his memories of his past and present lives were restored, he assumed his Endymion form to help the Senshi and tried his best to protect Usagi from the dangers of overusing the Silver Crystal. However, because of his dedication he is forced to join the Dark Kingdom or the Shitennou will be killed. He also joins to keep a promise with Usagi that they will not destroy the planet. Learning that the Silver Crystal made Metaria stronger every time Sailor Moon used it, Endymion took Metaria into his body before succumbing to its dark power. Now an evil parody of himself, Dark Prince Endymion, he almost killed Sailor Mercury when Sailor Moon was forced to kill him to stop Metaria. He was revived once Sailor Moon managed to finally control the Crystal's power and destroyed Metaria for good.