Sandy Cheeks
Sandy Cheeks is an intelligent, scientific squirrel who lives in Bikini Bottom and is a close friend of SpongeBob and Patrick. 

She is from Texas and it is for this reason that she talks in a Southern accent, and is proud of her home state which is brought up many times and has been shown to have many tough Qualities.

Sandy is skilled at karate and frequently enjoys practicing it with SpongeBob, she is shown to be an excellent bodybuilder, is a rodeo champion and has unusual scientific skills and can build great inventions.

She has to wear a deep sea dive suit when she is underwater with a helmet in order to breathe, and SpongeBob and Patrick have to when they visit her tree-dome.  Sandy is normally portrayed as kind, helpful, and understanding.