I redid my oc. A lot about her has changed. Just keep that in mind.
Here she is:

Aaron-
Age: 500 (looks 19)
Height: 5'5"
Weight: 80 lbs
Race: Asian/ Demon
Skin: White
Hair: White
Eyes: grey
Hp: 20
Attack: 45
Defense: 5

Additional features: black horns and tail, scars on arms and palms of hands, bleeds and cries ink, juggles knife with one hand when bored, irritated, or nervous, blushes a cool grey, long scars on her arms
Soul: badly cracked monster soul
Other: does satanic rituals to keep herself in control, has some moments when she breaks down, once she starts fighting, it's difficult for her to stop, cannot summon weapons (because she is the absence of light) so carries around many small throwing knives, afraid of loosing control