Sibella is the vampire daughter of Dracula. She has green eyes, light purple skin, purple hair, red shoes, and a dark purple dress with a red belt. Sibella can turn into a bat at will, which she uses for important reasons such as rescuing or looking for people, or for simple things such as delivering a pizza.

Unlike traditional vampires like her father, she is immune to sunlight and can go out during the day. She is also shown to be the most strongly willed of the five Grimwood girls.