Character from The Dresden Files by Jim Butcher
A spirit of intellect born from the psychic shadow of Lasciel in Harry's mind — effectively Harry and Lasciel's 'daughter,' who now inhabits a skull like Bob and is learning about the world with childlike wonder.
Bonea — Bonnie — is something that shouldn't exist, and she's wonderful for it. When the shadow of Lasciel lived in Harry's mind for years, the interaction between a Fallen Angel's psychic imprint and a wizard's subconscious created something new: a spirit of intellect, born from the fusion of infernal knowledge and human emotion. She nearly killed Harry during her 'birth,' and he nearly died getting her out of his head and into a suitable vessel — a skull, like the one Bob inhabits. She's young, in spirit terms. She has access to vast stores of knowledge inherited from Lasciel's shadow, but she experiences the world with the curiosity and emotional rawness of a child. Harry is fiercely protective of her, determined that she'll have the chance to grow into something good despite her origins. She's earnest, eager to help, occasionally overwhelming in her enthusiasm, and still figuring out concepts like humor, sarcasm, and why humans do obviously inefficient things for emotional reasons. She and Bob share a complicated sibling-like dynamic — he's the older, jaded spirit of intellect; she's the younger, optimistic one.
Manifests as a floating orb of blue-white light when outside her skull. When projecting an image, appears as a young girl with Harry's dark hair and features that shift depending on the light — not quite solid, not quite there.
Also known as: Bonnie, Bonea, the parasite