Lux uzumaki. King.

Height:6'11ft. Armored form:12'6ft.
Age:18.
Race: nephilim.

Armor.

Abilities: can use any jutsu, all stages of the Sharingan, Rinnegan, all stages of the Byakugan's transformation, aura and chakra control, full counter plus nullification, and infinite armor works.

Sacred gears:

Excalibur.

Lux Umbria.

Balmung.

Azure draconis.

Harem/angel peerage.

???. Queen.

Sapphire rose. Knight.

Dalla Mesa. Knight.

Konan. Rook.

Izumi hyoudou. Issei's sister. Pawn.

Irina shidou.

Airin senju. Rook.

Violet. Bishop.

Gabrielle. Bishop.

Orissa. Pawn.

Bridget. Pawn.

Gia. Pawn.

Ariana. Pawn.

Mizore. Pawn.

Just like the red and white dragon emperors there is a rivalry between two knights one of which defeated the two heavenly dragons and killed the original four satans and caused the great war to stop. He is known by many titles demon dragon slayer void walker, the true dragon emperor, the guardian avenger, and the true dragon slayer. When Lux Umbra draconis was on his death bed and carved a faded red carpet in history. God put half of Lux's soul in his sword Lux Umbria and made it so every reincarnation of Lux would have the sacred gear. However his rival was also sealed in a sacred gear and force to reincarnate as one of his descendants just like Lux.