Themari's a very different kind of villain from Doctor Creed. He's cadaverous, decadent and concerned with nothing but indulging his own vile nature. He can be found in the Haven sector of Cap Au Diable, and is available between levels 10-14. You'll need to carry out three newspaper missions and succeed at a Mayhem Mission before your broker offers you Themari as a contact.
Themari's the first contact in CoV who is actively evil. Other contacts have had their own agendas: Fortunata Kalinda is an Arachnos lackey, Mongoose a snake hunter, Burke a mercenary and Creed a deranged scientist. Each one engages your services for reasons of their own. But Themari wants to do wrong for its own sake, and assumes you'll want to as well.