Boogie-kun

Anjus sarcastic talking doll. He often tells Karin how useless she is which usually leads to Anju punishing him. The other dolls in Anjus room also talk and have their own personalities but Boogiekun is her favorite. BoogieKun is actually a murderers spirit trapped in a doll who becomes upset when he is away from Anju too long. In volume 3 of the manga one of Anjus classmates takes Boogiekun with grievous consequences until Anju comes to take Boogiekun back. Source: Wikipedia