This is Lukas Marx and he is a mercenary.  He's not picky about what jobs he takes.  If it pays right, he'll kill anything; vampire, lycanthrope, human.  It doesn't matter to Lukas.  Killing is what he does.  He's a relative loner though I'd imagine he has business connections.  All lines are open for this guy except for love interest.  But I'd be open to the possibility of a long lost half sibling, a cousin, enemies, business associates...  Toss anything at me.  You can check is journal for his character sheet.