[Espy]

He 'sees' everyone to a degree, since they're all relatively strong. Lev is a bit hard to see, though, because he doesn't have strong non-physical powers. He pretty much shows up as a very dim blur against the black background...At his best (without the help of his motorcycle), when Dante's having a nice adrenaline burst and not dead tired like he is now, he can make out some features of Rue's face, or Shealtiel's, because they're -really damn strong-

Auuuuuuugh. My mom's cooking something greasy x___________x My nose...(I've an insanely strong sense of smell, which can backfire nicely, ha, ha...)

EDIT: Forgot to mention that buildings for the most part don't emit aura. Unless someone strong has touched it/leaned on it/used magic on it/etc recently. Hence Dante's running into crap constantly...