This demon called Krow, is a cannibal, he shows no mercy and killed his sister and parents, then ate them. His other brother, who murdered him because he had enough, is Crow or Classb3, Krow is inside of classb3's body and protects or harrases him at times.

ClassB3, also known as Crow, is a mature person, he has a brother called Krow, Who killed and ate humans, Soon to be Their sister (Dove) and parents. ClassB3 had it after seeing his dead sister hanging from the ceiling light. Krow gave him a note saying 'MEET ME AT THE BLACK WIDOW' which was a nearby pub and so they met, ClassB3 killed Krow, he shot Krow in the head and Krow entered ClassB3's body, Krow haunts him, sometimes protecting him. And then ClassB3 joined the laboratory. (WHICH WASNT EXPERIMENTS)