Prince Demand

Prince Demand (プリンス・デマンド, Purinsu Demando, also Prince Demande/Dimande, Prince Diamond) is the leader of Planet Nemesis in the 30th century. He is the older brother of Saphir.

Because of the Black Moon Clan's beliefs that the Legendary Silver Crystal is a corruptive force, Wiseman sought Demand out and convinced him to use the Malefic Black Crystal's power against Crystal Tokyo. Demand and his allies initially plan to use the Black Crystal's time manipulative powers to travel back in time to the 20th century as part of "Operation: Replay", intending kill the past versions of the "White Moon" members who established Crystal Tokyo: The Sailor Guardians and Mamoru. But Demand, wanting to see the Legendary Silver Crystal's power for himself, launched an attack that wiped out most of Crystal Tokyo in a display of power. It resulted with Demand encountering Neo-Queen Serenity as she rushed out of the Crystal Palace in search of her daughter, Chibiusa. This led to Demand becoming obsessed with Neo-Queen Serenity, which extended to her past self Usagi Tsukino as he abducted her during her visit to the 30th century. Demand intends to force Usagi to submit to him, but she eventually manages to escape. Demand later turns on Wiseman upon realizing that he used him and the rest of the Black Moon Clan, and is forced to kill Saphir as his brother is under Wiseman's spell. Demand then steals the Silver Crystal of the present from Usagi and the one of the future from Black Lady, and attempts to bring them together to destroy the time-space continuum. But Sailor Pluto uses her forbidden Time Stop attack and prevent, with Demand attacking Usagi before she and Tuxedo Mask combine their powers to destroy him.

In the first anime adaptation, Demand has a similar story, with some differences. He initially intends to reason with Neo-Queen Serenity, explaining that he and his people are descendants of criminals, not criminals themselves. It is Wiseman, and not Demand himself, who kills Saphir, because the latter told his older brother that Wiseman has been manipulating them. In the final confrontation, Usagi too tries to persuade Demand to see that he is being manipulated by Wiseman. Between what Sailor Moon said and what he remembered Saphir trying to tell him, Demand is then positive that Wiseman was using him. When Wiseman tries to kill Usagi, Demand shields her from Wiseman's damage. Though fatally injured, he musters up enough strength to temporarily subdue Wiseman. Demand begged Usagi for forgiveness and asked her to watch over the remaining inhabitants of Nemesis, later dying in her arms.

In the anime reboot Sailor Moon Crystal, Demand's story closely follows that of the manga, but his death is similar to the first anime as he shields Sailor Moon from Death Phantom's attack. While openly stating his reason to personally kill her, Demand accepted her as his queen before being imploded by Death Phantom's power.

In the Sailor Moon: Another Story video game, Demand is encountered in the Moon Kingdom during Queen Beryl's invasion and ends up kidnapping Sailor Moon. Esmeraude mentions that Demand had the Barazuishou. When the Sailor Guardians catch up to Demand, the group is attacked by Sin. When the Guardians repel Sin, she manages to make a fatal blow on Demand quoting "That was for my mom and dad." Demand states that this is not the destiny he wanted and if he could have changed, it would have been so that there would not be any battles between the Black Moon Clan and Crystal Tokyo. Before he dies, he tells the Guardians to head to the future for if the future does not change, the present will.

In the Japanese series, Prince Demand is voiced by Kaneto Shiozawa until episode 41 of Sailor Moon R, and by Mamoru Miyano in Crystal and all media since. In the DIC English adaptation, his name is changed to Prince Diamond and is voiced by Robert Bockstael. In the Viz Media English adaptation, he is voiced by Matthew Mercer. In the musical adaptation, he has been played by Hikari Ono. Hikari jokingly commented that she was given "this completely unfeminine prince role", due to the fact that among cast members, Hikari was known for playing male or androgynous roles. These include Hawk's Eye, Kou Taiki, and Loof Merrow.