He appears and is part of his party during the time he is inside the Snow Wood Boarding House. He helps Jeff get out of the school by jumping a fence. Later in the game, he calls Ness's party to ask for the player's name and later wants to confirm it after being rescued from the Stonehenge base. At the end of the game, Tony sends a letter to Jeff asking for him to return.
In a discussion with Shigesato Itoi, it was heavily hinted that Tony was gay, as seen by his slightly obsessive manner towards Jeff.