Rinny is a Malino, a short anthropomorphic animal with human-like intelligence – in this case, a Bear Malino. Rinny is an unrepentant psychopath and serial killer, as well as a member of Pretty Blood, a human criminal organisation which traffics, tortures and kills her fellow Malinos. She delights in torture and holds no regard for anyone's life, willing to even sacrifice her own guards to save herself.
She considers herself as having been "born evil", but feigns trauma when cornered.