The Dresden Files: Portland
Benjamin Hutton was a focused practitioner, a summoner, who also worked for a financial firm in Downtown Portland. He summoned the demon Athralanax in a bid for power and knowledge and failed creating his containment circle. The demon escaped and possessed him.
Twenty years ago Athralanax was exorcised from a 15-year old host by Reverend Donald Buxman and Reverend Ernest Beauvais. When Athralanax reemerged from the Nevernever, he decided to seek out these priests and take his revenge.
While possessed by Athralanax, Hutton has green, reptilian eyes.
UPDATE: Hutton has since been exorcised of the demon Athralanax.