There is the Church.
The Church is full of people who kill the fuck out of heretics and other undesirables like Vampires and rogue magi.
They don't use magic, but they're amazingly well trained to the point of being practically super human. Some can use magic in special cases though.
There are Magi.
Magi can use their magic circuits and prana to reproduce miracles in the world. They can do all kinds of fancy shit and may or may not be an amoral shit who kill the fuck out of other magi to fuel their research.
It's a cutthroat world for a wizard.
There are those that don't actually know any of that and are just humans, so they do normal human things.
There are those that hunt demons and other supernatural phenomenon. They've developed amazing techniques to fight against such creatures and are either highly trained or at least partially psychic.
There are aforementioned vampires who tend to be bloodthirsty and amoral fucks, because they permanently hunger for blood 'cause it makes them live. Not always the case though, some are all right.
Usually they're horrifyingly powerful, and if they're not now, they soon will be.
There are mixed blood people, who have ancestors that did something freaky with something not human and thus have powers beyond human capabilities, but it depends what they did freaky things with and how strong the blood is.
There are powerful abilities you can get from it, but the problem is that the stronger the blood, the more chance it'll take you over.