Gregory Fish is one of the exterminators in Flower City. The other two exterminators are Jessie Rowling and Robby Manhattan. Gregory can be made playable by befriending and asking him to move in, or by marrying him.
Gregory will usually not appear unless an exterminator has been hired, but, like other service NPCs, he may occasionally appear at community lots. He is also the only NPC in Flower City to have the Pleasure aspiration.
Although he shares the same maiden name as Michelle Bourne, they are not related.