A nocturnal person, Fisk spends most of his nights prowling about the city. His enhanced senses make him a topnotch hunter. He supports himself by selling his paintings, which are highly sought after by art collecters, since his senses offer him an altered view of the world. From this, he is possibly one of the wealthiest Specials.
His "costume" bring to the mind the look of a psychotic criminal. In fact, he was the first Special to wear a costume, in his youth. It's unclear whether Fisk is mentally unbalanced, or simply eccentric. His night time prowlings seem to be a search for something. He may be a suspect in the Special Serial Murders, though Simon is doubtful.
He has a base of operations, which he calls the "Shadowcave" and regularly consults with doctors and scientists to monitor his health and powers.