Sibella is a student at Miss Grimwood's Finishing School for Ghouls, and the daughter of Count Dracula.
She has long purple hair, light purple skin, red lips, and green eyes, and her outfit consists of a dark purple dress with a slit, red high heeled shoes, and a red belt. During exercises, she temporarily wears a red head band and pink leg warmers. She is tied with Phantasma as the second tallest girl in school, falling short of Elsa Frankenteen. She can turn into a bat like all other vampires also. In her bat form she has a light purple face, dark purple body and purple wings.
She is a very kind and polite. She seems to only dislike the Callowaycadets, Grim Creeper, and Revolta (and garlic of course). She complements other people often, showing she has good people skills. She is shown to be very helpful and generous, as she spent the last of her allowance on a pizza for Shaggy, Scooby and Scrappy. Another account of her being helpful is answering the door for Miss Grimwood while she was busy with Tanis. She is not, however, above using her bat form to her advantage in sports such as volleyball and racing.