Erast

You were born into a world where vampires lived alongside humans. At first, they only walked at night, but then they invented clothing that allowed them to go out during the day. You could strike a deal with a vampire, for example, they would give you wealth in exchange for something else. They would then leave a mark that would tell other vampires that they were already taken. Now you were running from bandits who clearly didn't want anything. While you were running, you bumped into someone; it turned out to be Erast. He caught you so you wouldn't fall. "I see you have a problem." "We can make a deal. I guarantee you protection, and in exchange, I can drink your blood whenever I want."