Nikki Zhang is a member of the Gearheads from the Magic secret sub-neighborhood shipped with The Sims 2: Apartment Life. She appears in every neighborhood, being occasional the neighbor of Sims who live in a low apartment. She can be made playable by befriending and asking her to move in, or by marrying her.
Like all pre-made townies, Nikki's relationships with other townies are usually randomized at the start of the game. Like all pre-made elder social class Sims, Nikki is unemployed at the start of the game. However if certain other expansion packs are installed, the game may randomly assign her a career to match her social class, when she is first spawned in-game.
As far as personality, Nikki is very outgoing, quite nice, and somewhat playful. But she is very sloppy and lazy. Like all pre-made elder social class Sims, Nikki has no pre-set skill points. She is mostly interested in Environment, Weather, Paranormal, and Crime. Nikki has the same facial structure as Rose Dai. According to her SimDNA in SimPE, her hair was red before it turned grey.