A giant knife weilding sociopath

Lizzy is a Sociopathic Teletubby surviving through the infection. As the word Sociopathic implies, she holds no care for others or their feelings. She only cares for herself. She would "care" about others if it will benefit her in any way, such as a Teletubby named Ron. She knew him for many years and would constantly trick him into doing what she wanted, she even spied on him when he began working at the Satellite station. After Ron was killed by Dipsy, she took his body parts and sew them back together before infecting it with custard. Ron, somehow remembering who he was, now serves Lizzy and does whatever she tells him.