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King Endymion is the name taken by Mamoru Chiba during the reign of Neo-Queen Serenity in the distant future. He did not appear for very long in either the anime or manga, so there is very little known about him. He was always seen wearing a lavender tuxedo and a white mask.
White tuxedo, lavender cloak and a white mask
King Endymion's first appearance is in Act 19. He is not actually in a physical form but a spiritual entity guarding the Crystal Palace while his real body sleeps. During this time he helps to guide the Sailor Senshi and his past self against the Black Moon Clan. It is then revealed to the Senshi that Mamoru never aged due to the Silver Crystal's power. It is the ghost of King Endymion who instructs Tuxedo Mask in the first use of his attack "Tuxedo La Smoking Bomber."
Prince Endymion becomes King at the end of the battle with the Dead Moon Circus when Helios, the priest of his former home, Elysion, hands him his sacred Golden Crystal atop his king's staff. After this, both Tuxedo Mask and Sailor Moon turn into their respective future selves, all of the Sailor Senshi transform into their princess forms. However, after this point, Mamoru is not seen in this form again.