Myrkiri

Myrkiri, or often nicknamed Myrki or Cottonberry by Ochiri, is a Reaper Horse demon summoning.  While a lot of her backstory is unknown, what is known is the one fateful night she stumbled across a litter of pups, which she murdered and consumed. Their father, blinded in rage, murdered her and kept her horn. A few months later, she was bonded to Ochiri through his father's ritual, able to be summoned at any point of his own will. 

Myrkiri's personality is hidden most of the time, she has shown an empathic side towards the young wolf, eventually becoming loyal to him. Ochiri was never afraid of her, and while wolves are often terrified of her, she has never shown to be bothered by this at all. She is a bit annoyed by the nickname Cottonberry, but she allows Ochiri to call her that when it's just the two of them.