Personalty:
Enzo appears to have a god complex, even going so far as to use biblical language in common speech. In spite of his vanities, he believes himself a force of nature and as such is obliged to create a world based on 'survival of the fittest' and all who share his eyes ARE the fittest to him.
But it seems violence isn't his first choice when he has a choice in the matter. He'll seek the peaceful route first before resorting to any means he has to. It seems he is honest and remorseful to any misdeeds he performed, expressing regret over taking Gillian (Cayden's mother) leg.
He is exceptionally patient, waiting years for his chance to take back what he perceives to be his. In spite of his disregard for non-evil eye users, he doesn't seem to hate them indiscriminately and he will compliment some that earn his respect. He just sees them as 'mice among owls'.
It seems he shared a friendship with Ged of the Shapeshifters once but a rift formed between them due to Enzo's extreme views. He is also father of Agatha Noir, and by extension, Topher's grandfather.