Nancy's ditzy and rather dorky rich cousin and unlikely best friend. Despite her clearly not being the sharpest spoon in the knife drawer, she's actually quite aware of such, and is still capable of showing a surprising amount of insight regarding people and their intentions. So she's aware of when people are trying to take advantage of her and won't stand for that one bit. Otherwise, she's probably one of the nicest, sweetest-natured people you'll meet and an excellent musician on top of it, with a particular affinity for the piano and jazz music. Many people are unaware that Sierra's old dress was supposed to lace up in front. Sometimes, it's questionable if Sierra herself was aware of this. Now she tends to wear a sweet-ass coat and it stopped mattering so much. She still shows too much cleavage.