As opposed to her sassy, forthright best friend Debbie Stevens, Sheila is intelligent and socially awkward. She spends most of her time studying and has little interests on her social life. A genius, Sheila was a capable inventress, creating a device to help Debbie fend off bugs, and she intended to become a doctor. This unfortunately makes Sheila an easy target for bullies, which Debbie defends her a lot of times.