Tales of the Peculiar Edit
He is only mentioned in Tales of the Peculiar, in the story "The Woman Who Befriended Ghosts".
João meets Hildy through letters, because Hildy would like to buy his house. When she comes to his house, they talk for a while, and eventually João falls in love with Hildy. They get married and have a daughter and a son. Needless to say, Hildy moves in his house.