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Ahhh
Lucrecia Cresent
(yes she has a last name for those of you who are not hard core enough fans to know.)

Sephiroth's biological mother. A young female scientist who served as an assistant to Grimoire Valentine, Vincent Valentine's father, having been dispatched to him by Shin-Ra. Her own unchecked ambitions into scientific study results in Grimoire's death, as he dies while saving her. Unable to face Vincent with the guilt she felt over his father's death, she severed ties with him.

She later became an assistant to Professor Hojo during the Jenova Project. Although Vincent, who was assigned to monitor the project and guard the scientists, fell in love with Lucrecia and attempted to court her, she still felt too guilty over the death of his father to return his affection. Instead, she entered a relationship with Hojo, who — along with Professor Gast — used both her and their unborn child as the subject of an experiment, attempting to achieve the Jenova Project's goal. Thereafter, Lucrecia began receiving visions of the horrors her unborn son would commit, and in an untimely encounter, discovered Vincent shot by Hojo. After his body was placed into a large tube, Lucrecia exposed him to a mysterious form of stagnated mako called "G Substance," causing the being known as "Chaos" to be absorbed into his body. Though his life was saved, he was left in a feral madness. Lucrecia then used an ancient materia called the Protomateria that can control Chaos to calm Vincent.

Disgusted with all that she had done and the changes Jenova's cells had wrought in her own body, she attempted to kill herself. However, she was unable to easily die because of the presence of Jenova's cells in her body, and, thus, she isolated herself in a cave located in a remote location.[19] She is later discovered by Vincent during the time frame of Final Fantasy VII, before she willingly encased herself in a large mako crystal after asking about if Sephiroth is dead yet.

As Dirge of Cerberus: Final Fantasy VII revealed; Lucrecia, before isolating herself from the rest of the world, copied her mind into the World Network in case someone was in need of her help. Though Shelke SND interface, Lucrecia helped Vincent master Chaos and embraced it as a part of himself. It is also hinted that despite her past relationship with Hojo, she clearly loves Vincent. In the epilogue, Vincent made his final visit to Lucrecia, with her shedding a tear from within her crystal prison. She was voiced by April Stewart(US) & Rio Natsuki(Japan) in the game.

I think Lucrecia is cool, I just think she was a bit misguided, you know? She was willing to have sex with Hojo, for one, and not only that, allowed him to experiment on their child. She let him because she thought as long as no one cared, she could do whatever she wanted to herself.
She couldn't see how Vincent felt for her, and because of it, she indirectly almost caused the end of the world and changed Vincent into that of a chaotic vampire.

So, basically, the Blind Genius. A sad, sad life to lead and see... Because they are so smart, yet cannot realize the simplest of things when it comes to love...