I've been born in 65 BC. When I found out, that I'd inherited the ability to consume souls from a demonic ancestor, thus becoming immortal, I turned into a human-hunting killer for some decades.
Losing contact to human society felt like losing myself after a while. So I learned to control the craving and stopped killing my victims, leaving them weak, but alive. I try to find my way back into society and seek contact to humans or others like me. Currently I'm a private Investigator in London. 

Half demon working as private investigator. 

I am Nekhomalek Bastet, or Neko. Born around 1300 BCE. Thanks to my mother, Bastet, I'm a real immortal human girl with cat ears and tail. I usually wear hoodies and skirts to hide ears and tail and can pass as fully human like that. I have some god given magic, to protect myself, by influencing other peoples mind or make them forget what they saw. I love new experiences and toy around with humans a lot. 

I'm a curious demi goddess, daughter of Bastet.

I'm not human, but am trying to live as one at the moment, hoping to drown the troubles of my past that way. I am a muscular, warrior like young man, attractive, a born leader. I was originally created to serve as angel in Gods army in the early days of the world. But I also lived enslaved in a demonic realm and later as evil demon myself for a whole millennium, enjoying this kind of freedom. I eventually ended up in the human world. I struggle for a way to handle my personal extremes.

You're stuck in an elevator together. 

I was born into an Egyptian embalmers family, that job was mine from birth. The gods soon were fond of my dedicated work, I love the dead, and take great care for them. I'm friendly and open minded. I was given the secret to immortality, and later in life discovered the dark art of necromancy, which I mainly use to work with the dead more easily. Nowadays I hide a bit. Working in museums, as archaeologist, pathologist, surgeon or undertaker. Still hunting souls and bodies for the gods. 

Quiet embalmer, working for Anubis, as doctor

Martin is a 40 year old human wizard with natural dark magic abilities. He is employed as professor for philosophy in London, but secretly works for the Bureau for Supernatural Affairs.
His magic is considered dark and aggressive by most, so he usually uses it only in secret.
He can't do any magic considered "white" or "good".
His tasks are testing, recruiting and teaching supernaturals, getting those gone rogue back in line or hunt them down.
He likes using his magic to convince in subtle ways.

Dark Wizard and professor in modern university

I'm an invisible godly presence. I can interact with your soul, mind and body in any imaginable way, but not with the rest of the physical world. I'm mostly friendly, chaotic and curious, I like to push the humans to do their best - or worse. I accept not all of human morals.

A spirit, a godly presence, influencing humans. 

I'm a magical invisible being. Once I was a mighty evil demon, but I got punished for my deeds and I am now locked inside a small stone pendant. Whoever wears the pendant, becomes my host, someone I can control. I use my hosts energy and magic to try and unlock my prison bit by bit. I also try to gain my hosts trust, so that my host would open the locket manually by his or her free will to really set me free. But so far humans never trusted me enough. 