King Endymion

King Endymion is the name taken by Mamoru Chiba during the reign of Neo-Queen Serenity in the distant future. He is the former King of Crystal Tokyo and the current King of the Moon.

Appearance
He was always seen wearing a lavender tuxedo and a white mask, as well as carrying a long white staff. Due to the power of the Silver Crystal, Mamoru stopped aging around 25 years old, and thus retains his youthful appearance as King Endymion, despite being thousands of years old at that point.

Pretty Soldier Sailor Stellar
King Endymion's first appearance is in Act 8. He is not actually shown in physical form but as 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 through a decimated Crystal Tokyo, where he reveals the circumstances behind the tragedy that befalls the Earth of the future. It is also revealed to the Senshi that Mamoru never aged due to the Silver Crystal's power, and ascended to the throne of Earth by the side of Neo-Queen Serenity, Sailor Moon's future self.

Puella Magi Elyon Magica
King Endymion is mentioned a couple of times in the short story.