Tabitha, in the Sabrina Online storyverse, is the quintessential 8-year-old girl. Little sister to Sabrina (yes, by the same parents -- the age difference is unusual, not impossible), she watches television, plays with toys, gets into places she shouldn't be, and in general, is everything her big sister used to be before she grew up. When it comes to collectibles of toys, Tabitha is most curious about her sister's collection of Transformers. She is so full of energy, like many young kids, she knows how to happily bid her big sis: "SABEEEENA!!"
Tabitha is also the titular character of the story of the same name, although she is much older there.