Orange eyes.

[Here, Rosalind, have the unimpressed selfie he sent Dirk when the change had first occurred! His eyes are bright, vivid orange, not hidden behind shades like the other boy does.]

I also got some sort of people radar--I can sense people around me. Where they are, what direction they're moving in... there are a couple people in the city I could probably tell you the location of right now, but I haven't tested that one enough.