Aunt Sis is Gladys' sister, Harold's sister-in-law, Billy's aunt, Nergal's wife, and Nergal Jr.'s mother. She is a sullen-looking woman with glasses, a large nose, and a hairstyle similar to Gladys. She is a spinster who had experienced four-and-a-half-minutes of love in her "pathetic, lonely life" before finally finding her match in the equally-lonely demon Nergal. Despite the fact that she is related to Billy, her nose is not pink like his or Harold's. Aunt Sis is a laid-back woman, who often looked bored until she fell for Nergal. Then, Aunt Sis began to smile a lot more. Aunt Sis also usually has a voice that sounds like she has a stroke. Aunt Sis fell in love with Nergal when a beehive fell in his pants, and he started to run around like crazy. Aunt Sis thought that he was dancing and instantly fell for him. Her first true love was actually a great dancer whom had stolen her heart.