Bart's fourth-grade teacher, Edna Krabappel, performs her job as adequately as possible, doing her best to supply her students with the minimal educational and experiential stimulus legally required by the Springfield Board of Education.
Despite Edna's efforts to streamline the amount of work required of her, she still finds it nearly impossible to carve out enough time for a cigarette break, and is usually reduced to smoking in the back of her classroom during the showing of educational films.
Divorced and bitter, Edna is never one to refuse a possible 'encounter' with the opposite sex. Underneath that everyday drab green cardigan beats the heart of a lusty middle-aged woman willing to do anything to hook a man.
Her desperation has led to more than a few unlikely relationships, including one with the fictional 'Woodrow,' a character invented by Bart Simpson in response to a personal ad Mrs Krabappel took out in the classifieds.
Though Bart is a constant thorn in her side, Mrs Krabappel cannot openly retaliate. However, 'Old Red,' her trusty grading pen, has never awarded Bart better than a 'D' grade, and Bart's endless blackboard punishment does afford her some small satisfaction.