Fisheye is a character appearing in Professor Layton and the Unwound Future. He is a high-ranking member of the Family, though not as high as Bostro. He can be seen in the Gilded Seven Casino, hiding behind a pillar. He is also one the many family members found with Bostro near the end of the Research Facility. Fisheye is found on the way into the surveillance room in the Mobile Fortress. So he isn't found until around the end of the game.
He gives you one puzzle at the end of the game which is called "Cat's-Eye View". Solving this puzzle earns you the maid sticker.