Karamia is both a Soul Eater oc and a regular oc, I made her FOR Soul Eater but use her in another universe as well :). 

Karamia as a Soul Eater oc is a weapon for my OC Deathora. She is also the twin sister of Karro. Karamia has black blood in her veins due to her mother, a witch who, because of medusa, became interested in the science of black blood and followed in her footsteps by doing experiments on her own children. She favored Karamia over her twin brother and therefore the experiments were much more.. Ethical. Somethings however went wrong and now any fluids from her body are black, at least natural ones. Whenever she cries it leaves black stains down her face that mostly don't go away. She is a Kishin Scythe due to her mother and her brother is a dagger. Karamia ran away after her mother went entirely batshit and went to live with Deathora, someone she knew as a child. They became partners a short time after and attended the school together.

As NOT a soul eater oc Karamia is a demon, much like her brother and their mother is a noble demoness. Karamia is still best friends with the other version of Deathora, Deidra. They work together to make music and Deidra knows 100% that she's a demon and trusts her. Karamia doesn't participate much in this story yet!