I'm still bummed we have't found Memento. [Have an elbow-bump back as she just... sorta tosses that out there.] But, alright.

A person's aura is... sort of like the emotional atmosphere coming off them, but it's not just that, because aspects of have some, ah, signifiers reflecting their physical condition. Or conditions, if they've got something going on. It looks a little like the 'aura' in Kirlian photography, if you've ever seen some of that.