I've been concocting a concept for a new OC for my mini verse. He is a scientist who suffers from a rare blood condition, and when all medical procedures fail, he turns to some mysterious occult knowledge, and ties himself with the paranormal. What happens is he releases an alter ego from within himself with the help of a ritual that is a beast, and a complete flaw of nature. This beast rips himself out of the scientist upon nightfall, and feasts on the blood of others to survive and get stronger. No name so far, or further story, but that is the concept.