Lizzie has a severe mental condition that leaves her sociopathic toward the majority of humanity and gives her a desire for a specific person to direct her full attention towards. Though she watched several people, the person she focused on was Jack. When he reciprocated her feelings, she became more obsessed with him, but at his insistence also more balanced, developing interests of her own. Aside from this, Lizzie appears to be somewhat of a romantic, wanting things like a traditional wedding.