Flo Kimble, real name presumed to be Florence Kimble, was Sharon Marsh's aunt. She appeared in the episode "Spookyfish".
She would come to visit the Marsh residence once a month, and would visit for nearly a week at a time. On her last visit, she gave her grandniece Shelly a television/CD player/surround-sound home theater. She also gave her grand nephew Stan an evil goldfish that killed numerous people, including Aunt Flo herself.
Before her death, Aunt Flo caught Sharon walking into the house, covered in blood and carrying a shovel after burying the first murdered victim of the fish. Flo comments that it reminds her of a time when she saw Sharon doing the exact same thing when Sharon was twelve years old, implying that Sharon may have been involved with another murder at the time. Sharon later buried her in the back yard with the other bodies.
Although she is, for the most part, kind and helpful, she appears to be sensitive and slightly unstable. For example, when she finds out that Stan doesn't like the goldfish she bought for him, she feels that she is a bad aunt and begins to sob. These could be behavioral effects of Parkinson's disease.