Nine the Phantom
"Destroy it? Hehe... Don't say such idiotic things. When did I every say that I would 'destroy' the world? I only intend to 'end' this world... This worthless, lie filled world."
Nine the Phantom
That Bastard (AKA her father)
Konoe Ayatsuki Mercury (コノエ＝アヤツキ＝マーキュリー)
BlazBlue: Continuum Shift (non-playable)
Nine the Phantom (ナイン＝ザ＝ファントム), born Konoe Ayatsuki Mercury (ノエ＝アヤツキ＝マーキュリー) and historically known as the Great Magister Nine, was one of the Six Heroes, the creator of Ars Magus, the Nox Nyctores and a hailed figure across the world. She was the older sister of Celica A. Mercury, wife to Jubei and mother of Kokonoe. Nine was known for her incredible talent with both magic and sorcery which she used in great efforts to keep her family safe.
Nine, as "Me" ("わたし"), is one of the main protagonists of XBlaze Lost: Memories and first appeared as Phantom (ファントム) in BlazBlue: Continuum Shift. Nine was finally made playable in BlazBlue: Central Fiction where she is the final boss of Arcade's Act I.
Harboring burning fury at the knowledge of the truth of the world and using that power to end the world, she is the owner of a fearsome will and stormy temper. With her exceptional intellect and magical power, she created the "Nox Nyctores" and "Ars Magus." She dotes upon her younger sister Celica, and won't forgive anyone who would harm her. 
Powers & Techniques
A close associate to the Imperator.
Nine's temporary form after she was sealed by Terumi in the Boundary... upon the Black Beast's defeat. Why she stays by the Imperator's side and does her bidding is unknown. 
Celica's older sister, and one of the Six Heroes.
She taught magic to the world, and helped develop its scientific hybrid, Ars Magus. Jubei is her husband, and between them, they have one very strong and powerful daughter: Kokonoe.
Like her belligerent personality, her magic is quite offensive and aggressive in its nature. She is determined in her ways, and loves her sister, which can sometime result in extremely reckless behavior. Her coffee's texture is said to change by the amount of sugar she puts in it. She also loves cats.
She can magic in its most pure form, which does not require the use of seithr. During the Dark War, she was admitted into the Mage's Guild as one of the Ten Sages at a very young age - a genius at her craft. She developed the Causality Weapons, Nox Nyctores, and led mankind to victory during the Dark War.
After the Dark War came to a close, she was killed by Terumi for 'knowing too much.' As of 2200AD, she been seen doing the Imperator's bidding as the mysterious figure, Phantom. 
Konoe A. Mercury
Celica A. Mercury's older sister, Nine. She's also one of the Six Heroes. 
Appearances in other Media
- BlazBlue: Central Fiction Consumer Edition Official Site (JP), Nine the Phantom
- BlazBlue: Central Fiction, Library Mode, Character #028
- BlazBlue: Centreal Fiction, Library Mode, Character #030
- BlazBlue: Central Fiction, Library Mode, Character #059