|Family|| Larry (father)|
Sierra is portrayed as a stereotypical rebellious, sassy, feisty, sharp-tongued, sarcastic teenage girl and is often teasing Hunter and arguing with him and complains a lot. She enjoys going out and loves shopping, fashion, and the latest stuff, but hates doing chores, contrive things, and going by the rules. Sierra also likes rock music.
Despite her somewhat antagonistic nature towards her parents, she deeply loves them. Sometimes, she teases and has disagreements with Hunter. She never really seems to interact much with Hunter other than being irritated by him and reprimanding him. However, she is seen playing a video game with him in "The Siegfried and Roy Fantasy Experience Movie." She is also sometimes asked to babysit Hunter, which she is often reluctant. She is seldom playful, especially with her brother.
Overall, Sierra is truly a good, loyal, kind-hearted girl.
She can sometimes be a bit odd, such as when she stated she no longer commits "rodent hate crimes".
Sierra is a slender, yet curvy, white lioness. She has green eyes.
Sierra wears a black collar.
- Sierra looks similar to Kate as an adolescent.
- She previously dated a guy named Dean who was a little older than her and already had children.
- While Sierra is completely naked like the rest of her family, she is the only one who casually wears an ornament accessory or any form of clothing.
- Sierra is similar to Debbie Thornberry from The Wild Thornberrys, who is also voiced by Danielle Harris.