Mrs. Cheng looks after Scarlett while she's in Hong Kong, although Cheng is strange, almost robotic and lifeless. Later on Mrs Cheng is killed by Lohan's men and revealed to be a shape changer working for the Old Ones, as her severed head changes back into that of a lizard-like creature. Scarlett says " it makes her feel sick to think that she was a shape-changer all along".
She is described as having the physique of a man with broad shoulders.
Mrs.Cheng is shown as strange, almost robotic and lifeless.