Prior to the start of Season 1, Kimberly Ann Possible, or better known as Kim Possible, was an ordinary young girl leading an ordinary life. By her early teen/late preteen years, she wanted to supplement her allowance, so she decided to start up her own babysitting business and set up her own website, "KimPossible.com", under the slogan, "I can do anything", to advertise her services. Soon after her site went live, Kim was accidentally contacted by Mr. McHenry who was in trouble, and was trying to contact a different group of heroes, "Team Impossible". Due to a typing error, he contacted "KimPossible.com" instead of "Impossible.com" After the rescue, Kim's fame as a hero grew until she was being contacted for help by people all over the world, including governments and royalty.
Kim is a confident, brave, beautiful and assertive teenager whose awareness of her own abilities is reflected well by her motto, "I can do anything." Her typical state of mind is to be bright and cheerful, and she has a kind and caring heart that compels her to help others and to put their well being above her own, although she can be arrogant and annoying at times, especially when people appear to do things better than she can. Her competitive nature and drive for perfection, as well as some of her insecurities, are consistent with a Type A personality. They also lead her to set high standards for herself, and sometimes give her a tendency to be bossy and to set standards for others that are too high - as was evident when she attempted to coach her brothers' soccer team - or to try and do things herself in order to save others from potential failure or harm.
Kim is tall, slender, and very strong. She has large, bright green eyes and long fiery red hair, which comes down to her shoulder and when seen from behind is shaped as a heart. She wore her hair in pigtails when she was in pre-k, and as a preteen wore it in a long ponytail.