Ian Byall is one of the pre-made downtownies in The Sims 2: Nightlife. He can be made playable by befriending and asking him to move in, or by marrying him. Ian's career is randomized at the start of the game and he is mainly interested in Food, Politics, Fashion, Travel, Sports, and Entertainment.
Ian's name is randomized when Downtown is generated. The name "Ian Byall" is only referenced in the game files. Like most downtownies in The Sims 2, Ian has a customized face. He uses the 1st face template in Create a Sim, except the face is shorter, and the eyebrows are from the 2nd face template.