Shirley Lin is a premade Sim living in Riverview. She is the younger sister of Roxie Lin, but their personalities are completely different in all way apart from stubbornness. They could not even decide how to decorate their parents old house. Shirley wants to be a doctor because she likes to help people.
Her older sister, Roxie, is her only family, as their parents aren't present in the game. She is almost the exact opposite of Roxie - she has no sense of humor, whereas Roxie has a good sense of humor, she is unflirty (Roxie is flirty), she is a coward (Roxie is brave), she is friendly (Roxie is grumpy, although the two traits do not conflict.) and she is a hopeless romantic, but Roxie has commitment issues.
Unlike Roxie, she appears to go for more neutral tones when picking what to wear and what to decorate her house in; her favorite color is pink, but she wears a simple, strappy cream dress and white sandals as her Everyday attire; her hair, although black like her sister's, is loose and shoulder-length adorned with a cream flower on the right hand side and she wears a little bit of eyeshadow, blusher in a fairly neutral tone and rose-red lipstick. She also wears a blue wristwatch on her left wrist.
Shirley loves Pop Music, eating Dim Sum and aspires to become a World Renowned Surgeon, and when the game begins she is a Bed Pan Cleaner with 2 points of logic, but it's required 4 to receive a promotion. She also has 1 point of cooking skill. She is 16 days away from becoming an adult.