Shanna Walton is one of the pre-made downtownies in The Sims 2: Nightlife. She can be made playable by befriending and asking her to move in, or by marrying her. Shanna's career is randomized at the start of the game, and she is mainly interested in Food, Politics, Paranormal, and Sports.
Her name is randomized when Downtown is generated. The name "Shanna Walton" is only referenced in the game files. Like most downtownies in The Sims 2, Shanna has a customized facial structure. She uses a customized version of the 20th Maxis face template in Create a Sim, except the eyebrows and mouth use the 2nd face template.