Above everything else, Marko is sadistic. This presents itself in his teasing demeanor, but also in the way he has no remorse in killing humans. Since he's a vampire, he requires their blood to feed on, but he also kills them for fun. He's also a bit of an adrenaline junkie, and enjoys having a good time, despite the fact that his definition of "having a good time" can sometimes include life-threatening situations. He's easygoing in general, but doesn't see mortals as much else besides prey