Mi-Ra Yu

Yoo Mi-ra is the 25th Master of the Moon Light Sword Style. She was invited to participate in the God Of High School Tournament.

[Spoiler] During the World Tournament and RagnarÖk, she received Original Greed and through it Ultio R bequeath her Ok-hwang's physical power (which he stole previously). Due to that, Sang Man-deok recognized her as Jade Emperor's successor. In addition, she also received Gáe Bolg from Seo Han-ryang, 27th Leader of National Assembly of the Homeless, and chosen by the five head "family" to become the 28th Leader. [/Spoiler]

[Spoiler] 17 years after RagnarÖk, she becomes one of The Six and leader of Neo Nox, a merger of National Assembly of the Homeless and Sang Man-Duk's faction of Nox. [/Spoiler]

(Source: God of High School Wiki)