Sierra Zhang is one of the pre-made townies in Sim State University from The Sims 2: University. She can be made playable by befriending and asking her to move in, or by marrying her. Like most pre-made townies from University, Sierra's skills are usually randomized at the start of the game. Strangely when editing in SimPE, Jared Starchild recognizes Sierra as his girlfriend, but the relation isn't mutual, as Sierra doesn't even know who Jared is. The reason for this unrequited relation is unexplained, but there are a few other Sims from University that have these sorts of quirks.