She is the principal at Dimmsdale Elementary School and was once in love with Denzel Crocker, but broke up with him when she realized about his obsession with fairies. She is mildly obese, loves any kind of food, but mentions she is "frosting intolerant".
Geraldine is depicted as a heavy set, large bottom/breasts woman who seems to love jelly donuts, as revealed in often trying to hit using a flail anyone who gets too close to the donut. She is usually in her school outfit of a blue businesswoman's suit which combines the jacket and about knee-length skirt with a light blue blouse like shirt underneath. Based on the episode "The Secret Origin of Denzel Crocker!", her age is estimated to be around late 30's to early 40's assuming she is a close in age to Mr. Crocker.