Chosen to be the vessel of the second Angel(Grief) to carry out Saburra's prophecy. Noire's fate set in stone to wield the inhumane properties of the Curse of Saburra. Better described as a "necromantic plague/infection" living in her body and mind. Giving her abilities from immortal strength and persistence in combat to horrifying body transformations and undead angelic qualities.
As powerful as she might seem, there's a toll to pay for one who can maintain these attributes of necromancy.
Noire is in a constant state of mental instability, causing her overall personality to be stoic and emotionless in order to contain/calm this curse.
She becomes most fueled by the taste or touch of flesh... draining the life of those she needs to survive.
Although she comes across careless, it's her way of protecting those she cares for rather than eating them alive.
She cannot stray too far from Grief's path. The gift given to Noire, from Grief, is the core reasoning for her abilities and survival. Binding her to be the one chosen to seek the lost fragments of the planet scattered across their solar system and beyond. Therefore setting the foreground for her chaotic planet hopping journey.