She's an anthropomorphic, purple sheep, which has wool on the top of her head and as her tail, and wears a white sweater and a purple bow on her head. She has an "imaginary", and "innocent and definitely not a murderous" friend, a green pickle. The pickle is actually sentient and alive, and is quite brutal with its murderous actions, for its own pleasure. Lammy herself, though, is sweet, kind, and actually innocent. She presumably has schizophrenia.