Lia Zhang

Not a lot is known about Lia's backstory because she is not forthcoming about it. She often uses her powers of deception to mask the truth of her words or the feelings behind them.

Lia and her mother risked getting deported, as they were in America illegally, so a person involved in a cult found them and, to Lia's mother, this was a savior. Lia grew up in a cult and killed a man when she was nine. There is no mention of her father.

She is bilingual and ran away from home when she was young. She was living on the streets when the FBI found her. Soon after that she joined the Naturals program and was the second student (the first was Dean).

Her real name is Sadie.

Natural Skills
Lia is a natural lie detector, though the ability was honed by her upbringing. She is respected and semi-feared by all the other kids because she is able to tell if they are lying.

She is bilingual and ran away from home when she was young. Soon after that she was recruited by the Naturals program and was the second student (the first was Dean).

Michael
Michael and Lia have an off and on relationship, which works best for the pair. While in the beginning of the series the two are off [again], in the end of the series they are together.

Cassie
Lia and Cassie's personalities are very different and sometimes they don't get along. Lia feels threatened by Michael's attachment to Cassie, while Cassie is threatened by Lia's demeanor and snark. Their friendship starts off rather rocky, but with time they start to have a better understanding of each other, though they do have more of a love/hate relationship then, say, Lia and Sloane.

Dean
Lia and Dean became like brother and sister in the time they had together alone before others joined the Naturals. She can be overprotective of Dean, who she thinks of as an older brother.

Trivia

 * While Lia may seem like she is a party girl, she is very smart [though not as smart as Sloane].
 * She has a very different style of fashion compared to Cassie.
 * Her real name is revealed to be Sadie during a game of Truth or Dare.