she is very much made of chocolate. She's even confected a white chocolate dress and bow! Probably for thematic coherence. Ester is part of a predictably large family of anthropomorphic bunnies, though she wasn't "born" quite like the others, as her hollow, sweet body may suggest. She found an ordinary chocolate egg one day and somehow was convinced she laid it, so she takes care of it believing it's her offspring. It's not. She is not very good at understanding rabbit reproduction.