Identical to his other 3 brothers, Jack is 167 cm tall. Together with William, his twin brother, he is the second child: both are a year younger than Joe. He has black hair with a straight quiff in front of his forehead, round brown eyes, a square chin, a bulbous nose from which a pair of pointed black moustaches emerge. He always keeps his hands behind his back. Calm, submissive, thoughtful, modest, reserved. He has many talents that he avoids highlighting. He's passionate about engineering