Gender: Female
Race: Human
Eyes: Yellow
Hair: Pink
Weapon: Magic
Education: Magic Guild
Status: Active

Konoe A. Mercury, more commonly known as Nine, was a witch and one of the Six Heroes.

Nine is a person who likes to do things her own way, a trait shared by her daughter. She's a kind-hearted individual who cares about her friends, especially her younger sister Celica. However, she is not easy on Kazuma. Although she seems to have a mature and serious personality, she can be somewhat impulsive and violent when angered (as shown when she attempted to use a fire spell on Bloodedge for annoying her). She was this way even with Jubei before falling in love with him.

Konoe was a witch who went by the name of Nine. She had long, pink hair and dresses like a stereotypical witch. The name "Nine" comes from her being the ninth member of the Magic Guild's Ten Sages. Celica A. Mercury is her sister, Shūichirō Ayatsuki is her father, and her mother is deceased; she is the mother of Kokonoe.

Nine's role in the story is further explained in the novel, BlazBlue: Phase 0, where she tells Ragna to beware of Terumi.

She passed down her knowledge of magic to mankind during the Dark War. During the Dark War, she created the Nox Nyctores in order to help humans fight against the Black Beast. After the war, she discovered what Terumi's future plans were, and he killed her, giving Kokonoe a motivation to despise Terumi. She created the Nox Nyctores using human transmutation, a process that requires thousands of human souls. Due to similarities in their appearance and abilities, Phantom may have some connection to Nine in the third game it's confirmed that she is Nine. It is notable that in Lambda's arcade mode, Hazama tells Kokonoe that the magical power he used to create Mu belongs to Nine. In the Extra Story, "That Which Is Inherited", it is revealed that the process through which the Nox Nyctores were created involved the compressing of seithr into a solid unit, then implanting the unit with the soul of a Black Beast. This compression spell, known as "Infinite Gravity", was used by Nine to create the Nox Nyctores and defeat the Beast, and later by Kokonoe to implant a Black Beast's soul into Ignis.

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